CN215463327U - Spiral wound membrane module - Google Patents
Spiral wound membrane module Download PDFInfo
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- CN215463327U CN215463327U CN202023276501.2U CN202023276501U CN215463327U CN 215463327 U CN215463327 U CN 215463327U CN 202023276501 U CN202023276501 U CN 202023276501U CN 215463327 U CN215463327 U CN 215463327U
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Abstract
The utility model provides a roll-type membrane assembly, which comprises a membrane and a permeation side separation net arranged on the permeation liquid side of the membrane; the permeation side separation net is a polypropylene hard elastic film. The network pore structure of the polypropylene high-molecular hard elastic membrane provides a wide flow channel space for penetrating fluid which enters the permeation side through the membrane, so that the water flux in the membrane filtration process is effectively improved, and the polypropylene high-molecular hard elastic membrane has a relatively irregular network pore structure, so that the wider flow channel space is provided for the penetrating fluid which enters the permeation side through the membrane, the system operation pressure is reduced, the service life of the membrane assembly is prolonged, and the energy conservation and consumption reduction of the roll-type membrane assembly are contributed. Meanwhile, the polypropylene high-molecular hard elastic membrane provides effective back lining for the membrane in the roll-up membrane component, and the membrane is protected from being damaged by external force. The utility model effectively improves the overall performance of the roll-type membrane module from the aspect of membrane module manufacturing technology.
Description
Technical Field
The utility model belongs to the technical field of spiral-wound membrane modules, relates to a spiral-wound membrane module, and particularly relates to a spiral-wound membrane module containing a polypropylene hard elastic membrane permeation side separation net.
Background
The membrane method water treatment technology develops rapidly since the birth of the last century and makes great contribution to the global sustainable development strategy. The roll-type membrane component is also called spiral roll-type membrane component, is developed successfully in 60 years, becomes a commonly applied membrane component form due to high filling density and low manufacturing cost, occupies most market share (about 75 percent) in the reverse osmosis field, is the most widely applied membrane application form in the current market, and is also the most important membrane component form in the current reverse osmosis, ultrafiltration and gas separation processes.
The roll-type membrane module has the main advantages of high packing density, simple and convenient use and operation and consistent industrial standard, so that the membrane is in the form of the roll-type membrane on most membrane using occasions, and the roll-type membrane module (SWM) is also a basic component for building seawater desalination, brackish water desalination and various sewage purification treatment facilities. The roll-up membrane module is usually made by rolling up a plurality of layers of membrane sheets, a water inlet side separation net and a permeation side separation net around a porous collecting pipe. In practice, several membrane elements are typically sealed in series with their central tubes and installed in a pressure vessel to form a unit. The water inlet side separation net and the permeation side separation net simultaneously play roles in separating the membrane and forming a necessary water flowing channel, and the geometric structural characteristics of the two separation nets determine the performance of the whole roll-type membrane component to a great extent.
However, currently, there is little research on the industrial application of the separation net on both sides of the rolled membrane module, and particularly, the permeation side separation net is usually ignored due to the influence of the pressure drop in the permeation channel which is assumed to be negligible.
Therefore, how to obtain a more suitable permeate-side separation net in a rolled membrane module to further improve and maintain the performance of the rolled membrane module has become one of the problems that many researchers in the field pay attention to.
SUMMERY OF THE UTILITY MODEL
In view of this, the technical problem to be solved by the present invention is to provide a rolled membrane module, in particular to a permeate side separation net of a rolled membrane module. The polypropylene hard elastic membrane permeation side separation net provided by the utility model not only can meet the requirements of membrane module manufacturing hardness and stability, but also effectively improves the water flux in the membrane filtration process, improves the overall performance of a roll-type membrane module, and prolongs the service life of the membrane module. And the application method is simple and is beneficial to industrial realization.
The utility model provides a roll-type membrane assembly, which comprises a membrane and a permeation side separation net arranged on the permeation liquid side of the membrane;
the permeation side separation net is a polypropylene hard elastic film.
Preferably, the rolled membrane module comprises a membrane sheet and a separation net;
the membrane comprises one or more of a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, a microfiltration membrane and a pervaporation membrane.
Preferably, the mesh comprises a permeate side mesh;
the separation net also comprises a water inlet side separation net.
Preferably, the thickness of the polypropylene hard elastic film is 20-35 mil;
the aperture of the polypropylene hard elastic membrane is 1-10 mm.
Preferably, the molecular weight of the polypropylene hard elastic membrane is 180-400 kDa;
the elastic modulus of the polypropylene hard elastic film is 0.9-2.8 Gpa;
the membrane comprises one or more of a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, a microfiltration membrane and a pervaporation membrane.
Preferably, the spiral-wound membrane module further comprises a water inlet side separation net, a perforated central pipe and a shell, wherein the water inlet side separation net is arranged on the other side of the membrane;
the water inlet side separation net is made of one or more of polyethylene, polypropylene, polyethylene terephthalate, polyacrylonitrile and polystyrene;
the thickness of the water inlet side separation net is 13-27 mil.
Preferably, the membrane sheet is compounded with the active separation layer facing inwards and the support layer facing outwards to form a membrane sheet group;
the compounding comprises one or more of folding, pressing, bonding, kneading and rolling;
and a water inlet side separation net is arranged between the active separation layers of the membrane group.
Preferably, the set of membranes comprises a single set or a plurality of sets;
a permeation side separation net is arranged between the membrane groups;
and a permeation side separation net is arranged between the membrane group and the perforated central pipe.
Preferably, the number of the multiple groups is 2-10 groups;
the perforated center tube is 9-19 inches in length.
Preferably, the permeation side separation net and the membrane group are sequentially wound and wrapped on the perforated central pipe;
and the membrane group are sealed and compounded.
The utility model provides a roll-type membrane assembly, which comprises a membrane and a permeation side separation net arranged on the permeation liquid side of the membrane; the permeation side separation net is a polypropylene hard elastic film. Compared with the prior art, the utility model aims at the problems that in the research of the existing roll-type membrane module, the related industrialized research on the permeate side separation net of the roll-type membrane module is less, and the permeate side separation net is usually neglected due to the influence that the pressure drop in a permeate channel can be ignored.
The present invention is based on the insight that the importance of the permeate side spacer net should be emphasized more in the development requirements of a roll-to-roll membrane element design from an industrial point of view, and in particular the understanding of the permeate side pressure drop effect in relation to the membrane width, largely determines the efficiency of large roll-to-roll membrane elements within the industry. And the traditional roll-type membrane component permeation side separation net is a relatively dense fabric woven by thin plastic fibers, and the mesh fabric can deform to a certain extent under the thrust action of the high-pressure water inlet side, so that the fluid flow, pollutant accumulation and flow pressure drop are changed, and the overall performance of the roll-type membrane component is influenced.
The utility model provides a roll-type membrane component. The utility model adopts the polypropylene macromolecule hard elastic membrane to replace the traditional roll-type membrane component permeation side separation net, and is used for preparing the roll-type membrane component. Under the action of large axial force (thrust) generated by high-pressure inlet flow, the membrane and the separation net are subjected to considerable stress in the direction perpendicular to the axis of the membrane element, and in order to ensure the integrity and the integral rigidity of the roll-type membrane assembly, the membrane, the polypropylene high-molecular hard elastic membrane and the water inlet side separation net are tightly wrapped on the perforated central pipe. The permeation side separation net can bear extra normal stress due to the high pressure commonly existing on the water inlet side in the roll-type membrane component, and compared with the conventional permeation side separation net of the roll-type membrane component, the polypropylene high-molecular hard elastic membrane provides effective back lining for the membrane in the roll-type membrane component and protects the membrane from being damaged by external force; and the polypropylene macromolecule hard elastic membrane has a relatively irregular network pore structure, so that a wider flow channel space is provided for penetrating fluid which penetrates through the membrane and enters a permeation side, namely, the obstruction of feed liquid separation in the process of pressure-driven membrane filtration is reduced, the system operation pressure is reduced, the service life of the membrane assembly is prolonged, and the energy conservation and consumption reduction of the roll-type membrane assembly are facilitated.
The utility model adopts the polypropylene high polymer material meeting the requirements of membrane module manufacturing hardness and stability to manufacture the polypropylene high polymer hard elastic membrane to replace the traditional spiral membrane element permeation side separation net, and the network pore structure of the polypropylene high polymer hard elastic membrane provides wide flow channel space for the permeation liquid entering the permeation side through the membrane, thereby effectively improving the water flux in the membrane filtration process. The polypropylene macromolecule hard elastic membrane replaces the traditional roll-type membrane component permeation side separation net, the integral performance of the roll-type membrane component is effectively improved on the one hand from the aspect of membrane component manufacturing technology, and the application method is simple and beneficial to industrial realization.
Experimental results show that the water yield of the roll-type membrane module prepared by the utility model is more than or equal to 0.15m according to 1812 domestic reverse osmosis membrane element in the national standard document GB/T34241-containing 2017 roll-type polyamide composite reverse osmosis membrane element3D, stable desalination rate of more than or equal to 96 percent, and the water yield of the obtained membrane element is 0.166m3And d, the water yield of the membrane element is effectively improved by more than 10%, and the desalination rate is stabilized to more than 99.5%.
Drawings
Fig. 1 is a schematic diagram of the structure of a roll-type membrane module provided by the utility model.
Detailed Description
For a further understanding of the utility model, preferred embodiments of the utility model are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate the features and advantages of the utility model and are not intended to limit the utility model to the claims.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in purity, and the present invention preferably employs purity which is conventional in the field of analytical pure or rolled membrane modules.
The utility model provides a roll-type membrane assembly, which comprises a membrane and a permeation side separation net arranged on the permeation liquid side of the membrane;
the permeation side separation net is a polypropylene hard elastic film.
In the present invention, the spiral wound membrane is a spiral wound membrane.
The utility model is not particularly limited to other components of the spiral-wound membrane module in principle, and a person skilled in the art can adjust and select the components according to actual production conditions, quality requirements and application requirements.
The specific type of the membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements.
The utility model is not particularly limited in scope of the separation net in principle, and can be adjusted and selected by those skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the roll-type membrane module, the separation net preferably comprises a permeation side separation net, and more preferably, the separation net further comprises a water inlet side separation net.
The utility model provides a roll-type membrane assembly, which comprises a membrane and a permeation side separation net arranged on the permeation liquid side of the membrane;
the permeation side separation net is a polypropylene hard elastic film.
The thickness of the polypropylene hard elastic membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the thickness of the polypropylene hard elastic membrane is preferably 20-35 mils, more preferably 22-33 mils, and more preferably 25-30 mils.
The pore diameter of the polypropylene hard elastic membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the pore diameter of the polypropylene hard elastic membrane is preferably 1-10 mm, more preferably 3-8 mm, and more preferably 5-6 mm.
The molecular weight of the polypropylene hard elastic membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the molecular weight of the polypropylene hard elastic membrane is preferably 180-400 kDa, more preferably 230-350 kDa, and more preferably 280-300 kDa.
The elastic modulus of the polypropylene hard elastic membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the elastic modulus of the polypropylene hard elastic membrane is preferably 0.9-2.8 Gpa, more preferably 1.3-2.4 Gpa, and more preferably 1.7-2.0 Gpa.
The specific selection of the membrane is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements.
The utility model is a complete and detailed integral technical scheme, better improves the application effect of the polypropylene macromolecule hard elastic membrane in the roll-type membrane component, and the roll-type membrane component preferably also comprises a water inlet side separation net, a perforated central pipe and a shell which are arranged on the other side of the membrane.
The material of the water inlet side separation net is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements.
The thickness of the water inlet side separation net is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the thickness of the water inlet side separation net is preferably 13-27 mils, more preferably 16-24 mils, and more preferably 19-21 mils.
The utility model is a complete and refined integral technical scheme, and better improves the application effect of the polypropylene high-molecular hard elastic membrane in the roll-type membrane assembly.
The mode of the compounding is not particularly limited in principle, and can be adjusted and selected by those skilled in the art according to actual production conditions, quality requirements and application requirements, and the compounding preferably includes one or more of folding, pressing, bonding, kneading and rolling, more preferably folding, pressing, bonding, kneading or rolling, and more preferably folding. In the present invention, the complexing preferably includes unilateral or multilateral complexing, and more preferably unilateral complexing.
The utility model is a complete and detailed integral technical scheme, better improves the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, and a water inlet side separation net is preferably arranged between the active separation layers of the membrane module.
The utility model is a complete and detailed integral technical scheme, better improves the application effect of the polypropylene high-molecular hard elastic membrane in the roll-type membrane component, and the membrane component preferably comprises one or more groups.
The utility model is a complete and refined integral technical scheme, better improves the application effect of the polypropylene macromolecule hard elastic membrane in the spiral wound membrane module, and a permeation side separation net is preferably arranged between the membrane groups.
The utility model is a complete and refined integral technical scheme, better improves the application effect of the polypropylene macromolecule hard elastic membrane in the spiral wound membrane module, and a permeation side separation net is preferably arranged between the membrane group and the perforated central pipe.
The number of the multiple groups of the spiral-wound membrane module is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the spiral-wound membrane module, the number of the multiple groups is preferably 2-10 groups, more preferably 3-9 groups, more preferably 4-8 groups, and more preferably 5-7 groups.
The length of the perforated central pipe is not particularly limited in principle, and can be adjusted and selected by a person skilled in the art according to actual production conditions, quality requirements and application requirements, in order to better improve the application effect of the polypropylene high-molecular hard elastic membrane in the roll-type membrane module, the length of the perforated central pipe is preferably 9-19 inches, more preferably 11-17 inches, and more preferably 13-15 inches.
The utility model is a complete and refined integral technical scheme, better improves the application effect of the polypropylene macromolecule hard elastic membrane in the roll type membrane component, and the permeation side separation net and the membrane component are preferably wound and wrapped on the perforated central tube in sequence.
The utility model is not particularly limited to the compounding manner between the membrane group and the membrane group in principle, and a person skilled in the art can adjust and select the compounding manner according to the actual production condition, the quality requirement and the application requirement.
The utility model is a complete and refined integral technical scheme, better improves the application effect of the polypropylene macromolecule hard elastic membrane in the roll type membrane component, adopts the polypropylene macromolecule hard elastic membrane to replace the traditional roll type membrane component permeation side separation net for preparing the roll type membrane component, also provides the implementation process of the roll type membrane component preparation, and concretely comprises the following steps:
the diaphragm used for rolling the roll-type membrane assembly is cut into a 45-60 cm diaphragm assembly along the length direction of the diaphragm, the cut diaphragm is folded along the width edge direction with a blank of 1-2 cm, the diaphragm active separation layer faces inwards and the diaphragm supporting layer faces outwards during folding, the water inlet side separation net with the same size is placed between the folded diaphragm active layers according to the size of the cut diaphragm, and in addition, the diaphragm assemblies are separated by a polypropylene high-polymer hard elastic membrane.
The polypropylene high-molecular hard elastic membrane not only provides an effective backing for the membrane assembly, but also has a relatively irregular network pore structure, so that a wide flow channel space of a permeation side channel is formed, and the permeation flux performance of the roll-type membrane assembly is promoted. More importantly, the polypropylene macromolecule hard elastic membrane reduces the obstruction of feed liquid separation in the process of pressure-driven membrane filtration, so that the system operation pressure is reduced and the energy consumption is reduced.
According to the sequence of the polypropylene macromolecule hard elastic membrane and the membrane group (the middle is provided with the water inlet side separation net), the membrane group is tightly wrapped on the perforated central pipe in a winding mode after being coated with glue, and finally the periphery is wound and sealed by an adhesive tape to obtain the roll-up membrane component.
In the utility model, the membrane of the roll-type membrane component comprises a reverse osmosis membrane, a nanofiltration membrane and other membranes used for preparing the roll-type membrane component.
In the rolled membrane modules of the present invention, the perforated center tube may have a length of 9 inches, 10 inches, 12 inches, 13 inches, etc. The membrane groups may preferably be 2, 2.5 and 3 groups for 9 inch, 10 inch and 12 inch center tubes and 5-10 groups for 13 inch long perforated center tubes.
Referring to fig. 1, fig. 1 is a schematic diagram of a structure of a rolled membrane module provided by the present invention. Wherein, 1 is the diaphragm group that the folding diaphragm formed, 2 is the side of intaking and separates the net, 3 is the infiltration side and separates the net, 4 is the glue line, 5 is the perforation center tube, 6 is the end cover, 7 is the feed flow direction, 8 is the permeate flow direction
The utility model provides a spiral wound membrane module, which comprises a polypropylene hard elastic membrane permeation side separation net. The utility model adopts the polypropylene macromolecule hard elastic membrane to replace the traditional roll-type membrane component permeation side separation net, and is used for preparing the roll-type membrane component. Under the action of large axial force (thrust) generated by high-pressure inlet flow, the membrane and the separation net are subjected to considerable stress in the direction perpendicular to the axis of the membrane element, and in order to ensure the integrity and the integral rigidity of the roll-type membrane assembly, the membrane, the polypropylene high-molecular hard elastic membrane and the water inlet side separation net are tightly wrapped on the perforated central pipe. The permeation side separation net can bear extra normal stress due to the high pressure commonly existing on the water inlet side in the roll-type membrane component, and compared with the conventional permeation side separation net of the roll-type membrane component, the polypropylene high-molecular hard elastic membrane provides effective back lining for the membrane in the roll-type membrane component and protects the membrane from being damaged by external force; and the polypropylene macromolecule hard elastic membrane has a relatively irregular network pore structure, so that a wider flow channel space is provided for penetrating fluid which penetrates through the membrane and enters a permeation side, namely, the obstruction of feed liquid separation in the process of pressure-driven membrane filtration is reduced, the system operation pressure is reduced, the service life of the membrane assembly is prolonged, and the energy conservation and consumption reduction of the roll-type membrane assembly are facilitated.
The utility model adopts the polypropylene high polymer material meeting the requirements of membrane module manufacturing hardness and stability to manufacture the polypropylene high polymer hard elastic membrane to replace the traditional spiral membrane element permeation side separation net, and the network pore structure of the polypropylene high polymer hard elastic membrane provides wide flow channel space for the permeation liquid entering the permeation side through the membrane, thereby effectively improving the water flux in the membrane filtration process. The polypropylene macromolecule hard elastic membrane replaces the traditional roll-type membrane component permeation side separation net, the integral performance of the roll-type membrane component is effectively improved on the one hand from the aspect of membrane component manufacturing technology, and the application method is simple and beneficial to industrial realization.
Experimental results show that 2 pages of the polyamide reverse osmosis composite membrane are cut into 2 groups of membranes, a water inlet side separation net with the thickness of 22mil which is traditionally applied is arranged between folded active separation layers of the membranes, the permeation side separation net between the membrane groups is replaced by the polypropylene high polymer hard elastic membrane, the thickness of the adopted polypropylene high polymer hard elastic membrane is 29mil, the pore diameter is 8mm, the length of a perforated central tube is 12 inches, the membrane groups and the polypropylene high polymer hard elastic membrane are sequentially wound and wrapped on the perforated central tube, and a 1812 type spiral wound polyamide reverse osmosis composite membrane element is obtained after glue is solidified. The spiral wound polyamide reverse osmosis composite membrane element rolled by the polypropylene high-molecular hard elastic membrane is applied, according to the requirements of 1812 household reverse osmosis membrane element water yield more than or equal to 0.15m3/d and stable desalination rate more than or equal to 96% in the national standard document GB/T34241-2017 wound polyamide composite reverse osmosis membrane element, the obtained membrane element water yield is 0.166m3/d, the water yield of the membrane element is effectively increased by more than 10%, and the desalination rate is stabilized at more than 99.5%.
For further illustration of the present invention, the following will describe a rolled membrane module in detail with reference to the following examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and the detailed implementation and specific operation procedures are given only for further illustration of the features and advantages of the present invention, not for limiting the claims of the present invention, and the protection scope of the present invention is not limited to the following examples.
Example 1
The diaphragm used for rolling the roll-type membrane assembly is cut into a 45-60 cm diaphragm assembly along the length direction of the diaphragm, the cut diaphragm is folded along the width edge direction with a blank of 1-2 cm, the diaphragm active separation layer faces inwards and the diaphragm supporting layer faces outwards during folding, the water inlet side separation net with the same size is placed between the folded diaphragm active layers according to the size of the cut diaphragm, and in addition, the diaphragm assemblies are separated by a polypropylene high-polymer hard elastic membrane.
Wherein, the membrane is a high desalting polyamide reverse osmosis composite membrane sold in the company, the thickness of the polypropylene hard elastic membrane is 28mil, and the aperture is 10 mm. The molecular weight of the polypropylene hard elastic membrane is 300kDa, and the elastic modulus is 1.2 Gpa. The side of intaking separates the net for polypropylene material, thickness is 22mil traditional application and separates the net.
According to the sequence of the polypropylene macromolecule hard elastic membrane and the membrane group (the middle is provided with the water inlet side separation net), the membrane group is tightly wrapped on the perforated central tube in a winding mode after being glued, and finally the periphery is wound and sealed by an adhesive tape to obtain the 1812 type roll-up membrane component.
The obtained 1812 type roll-type membrane component is evaluated according to the test requirements of 1812 household reverse osmosis membrane components in the national standard document GB/T34241-containing 2017 roll-type polyamide composite reverse osmosis membrane component, namely 250 +/-5 mg/L NaCl test solution, 0.41 +/-0.02 MPa test pressure, 7.5 +/-0.5 test solution pH value and 15 +/-1% recovery rateAnd the water yield of the obtained roll-type membrane module is 0.166m3And d, the water yield of the membrane element is higher than that of a 1812 household reverse osmosis membrane element in a national standard document GB/T34241-containing 2017 rolled polyamide composite reverse osmosis membrane element (the water yield is not less than 0.15 m)3And d) effectively improving the salt rejection rate by 10.7 percent and stabilizing the salt rejection rate to more than 99.5 percent.
Example 2
The diaphragm used for rolling the roll-type membrane assembly is cut into a 45-60 cm diaphragm assembly along the length direction of the diaphragm, the cut diaphragm is folded along the width edge direction with a blank of 1-2 cm, the diaphragm active separation layer faces inwards and the diaphragm supporting layer faces outwards during folding, the water inlet side separation net with the same size is placed between the folded diaphragm active layers according to the size of the cut diaphragm, and in addition, the diaphragm assemblies are separated by a polypropylene high-polymer hard elastic membrane.
Wherein, the membrane adopts the high desalination polyamide reverse osmosis composite membrane, and the thickness of the polypropylene hard elastic membrane is 28mil, and the aperture is 10 mm. The molecular weight of the polypropylene hard elastic membrane is 300kDa, and the elastic modulus is 1.2 Gpa. The side of intaking separates the net for polypropylene material, thickness is 22mil traditional application and separates the net.
According to the sequence of the polypropylene macromolecule hard elastic membrane and the membrane group (the middle part is provided with the water inlet side separation net), the membrane group is tightly wrapped on the perforated central pipe in a winding mode after being glued, and finally the periphery is wound and sealed by an adhesive tape to obtain the 2012 type roll-up membrane component.
The 2012 type roll-type membrane module is evaluated according to the test method of the 2012 household reverse osmosis membrane element in the national standard document GB/T34241-2017 roll-type polyamide composite reverse osmosis membrane element, namely the test requirements of 250 +/-5 mg/L NaCl test solution, 0.41 +/-0.02 MPa test pressure, 7.5 +/-0.5 test solution pH value and 15 +/-1% recovery rate, and the water yield of the obtained roll-type membrane module is 0.31m3And d, the water yield of the membrane element is higher than that of a 1812 household reverse osmosis membrane element in a national standard document GB/T34241-containing 2017 rolled polyamide composite reverse osmosis membrane element (the water yield is not less than 0.28 m)3And d) effectively improving the salt rejection rate by 10.7 percent and stabilizing the salt rejection rate to more than 99.5 percent.
Example 3
The diaphragm used for rolling the roll-type membrane assembly is cut into a 45-60 cm diaphragm assembly along the length direction of the diaphragm, the cut diaphragm is folded along the width edge direction with a blank of 1-2 cm, the diaphragm active separation layer faces inwards and the diaphragm supporting layer faces outwards during folding, the water inlet side separation net with the same size is placed between the folded diaphragm active layers according to the size of the cut diaphragm, and in addition, the diaphragm assemblies are separated by a polypropylene high-polymer hard elastic membrane.
Wherein, the membrane is an ultra-low pressure polyamide reverse osmosis composite membrane sold in the company, the thickness of the polypropylene hard elastic membrane is 30mil, and the pore diameter is 10 mm. The molecular weight of the polypropylene hard elastic membrane is 300kDa, and the elastic modulus is 1.2 Gpa. The side of intaking separates the net for polypropylene material, thickness is 22mil traditional application and separates the net.
According to the sequence of the polypropylene polymer hard elastic membrane and the membrane group (the middle is provided with the water inlet side separation net), the membrane group is tightly wrapped on a perforated central pipe in a winding mode after being glued, and finally the periphery is wound and sealed by an adhesive tape to obtain a 2521 type roll-up membrane component.
The obtained 2521 type roll-type membrane module is evaluated according to the test method of 2521 type ultra-low pressure reverse osmosis membrane element in the national standard document GB/T34241-2017 roll-type polyamide composite reverse osmosis membrane element, namely the test requirements of 500 +/-10 mg/LNaCl test solution, 0.69 +/-0.02 MPa test pressure, 7.5 +/-0.5 test solution pH value and 8 +/-1% recovery rate, and the water yield of the obtained roll-type membrane module is 1.22m3And d, the water yield of the membrane element is higher than the water yield requirement (more than or equal to 1.1 m) of 2521 type ultra-low pressure reverse osmosis membrane element in the national standard document GB/T34241-ion 2017 rolled polyamide composite reverse osmosis membrane element3And d) effectively improving the salt rejection rate by 10.9 percent and stabilizing the salt rejection rate to more than 99.2 percent.
While the present invention has been described in detail with respect to permeate side spacer networks of a rolled membrane module, the principles and embodiments of the present invention are described herein with particular reference to examples, which are provided only to facilitate an understanding of the methods and their core concepts, including the best mode, and to enable any person skilled in the art to practice the utility model, including making and using any devices or systems and performing any incorporated methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the utility model is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. A roll-type membrane component is characterized by comprising a membrane and a permeate side separation net arranged on the permeate side of the membrane;
the permeation side separation net is a polypropylene hard elastic film;
the spiral-wound membrane module further comprises a water inlet side separation net, a perforated central pipe and a shell, wherein the water inlet side separation net, the perforated central pipe and the shell are arranged on the other side of the membrane.
2. The rolled membrane module according to claim 1, characterized in that it comprises a membrane sheet and a spacer mesh;
the membrane comprises one or more of a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, a microfiltration membrane and a pervaporation membrane.
3. The rolled membrane module according to claim 1, characterized in that the spacer mesh comprises a permeate side spacer mesh;
the separation net also comprises a water inlet side separation net.
4. The roll film assembly of claim 1 wherein the polypropylene hard elastic film has a thickness of 20 to 35 mil;
the aperture of the polypropylene hard elastic membrane is 1-10 mm.
5. The roll-type membrane module according to claim 1, characterized in that the molecular weight of the polypropylene hard elastic membrane is 180-400 kDa;
the elastic modulus of the polypropylene hard elastic film is 0.9-2.8 Gpa;
the membrane comprises one or more of a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, a microfiltration membrane and a pervaporation membrane.
6. The roll-type membrane module according to claim 1, wherein the water inlet side barrier net is made of polyethylene, polypropylene, polyethylene terephthalate, polyacrylonitrile or polystyrene;
the thickness of the water inlet side separation net is 13-27 mil.
7. The rolled membrane module according to claim 6, wherein said membrane sheets are composited with active separation layers facing inwards and support layers facing outwards to form a membrane sheet set;
the compounding comprises one or more of folding, pressing, bonding, kneading and rolling;
and a water inlet side separation net is arranged between the active separation layers of the membrane group.
8. The membrane roll assembly according to claim 7 wherein the set of membranes comprises a single set or multiple sets;
a permeation side separation net is arranged between the membrane groups;
and a permeation side separation net is arranged between the membrane group and the perforated central pipe.
9. The rolled membrane module according to claim 8, wherein the number of the plurality of groups is 2 to 10 groups;
the perforated center tube is 9-19 inches in length.
10. The rolled membrane module according to claim 8, characterized in that the permeate side barrier web, membrane sheet group are wound in sequence and wrapped on a perforated central tube;
and the membrane group are sealed and compounded.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112619426A (en) * | 2020-12-29 | 2021-04-09 | 宁波日新恒力科技有限公司 | Application of spiral-wound membrane module permeation side separation net and polypropylene hard elastic membrane in spiral-wound membrane module |
| CN114272758A (en) * | 2022-01-27 | 2022-04-05 | 南京新核复合材料有限公司 | Carbon fiber combined permeable membrane |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112619426A (en) * | 2020-12-29 | 2021-04-09 | 宁波日新恒力科技有限公司 | Application of spiral-wound membrane module permeation side separation net and polypropylene hard elastic membrane in spiral-wound membrane module |
| CN114272758A (en) * | 2022-01-27 | 2022-04-05 | 南京新核复合材料有限公司 | Carbon fiber combined permeable membrane |
| CN114272758B (en) * | 2022-01-27 | 2022-10-28 | 南京新核复合材料有限公司 | Carbon fiber combined permeable membrane |
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