CN115677926A - Cationic polyelectrolyte type sludge dehydrating agent and preparation method and application thereof - Google Patents
Cationic polyelectrolyte type sludge dehydrating agent and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a cationic polyelectrolyte type sludge dehydrating agent, which comprises the following steps: s1: preparing a water phase: dissolving acrylamide solid with water, adding cationic ester polymerization monomer and cationic amide polymerization monomer, and mixing at 40-45 deg.C to obtain water solution; preparing an initiator, adding the initiator into the monomer aqueous solution, and uniformly mixing to obtain a water phase; preparing an oil phase: adding a surfactant sorbitan monostearate, a sorbitan fatty acid ester, an initiator azobisisobutyronitrile and cyclohexane and/or methylcyclohexane into a reaction vessel to prepare an oil phase; s2: polymerization reaction and S3: and (3) post-treatment: and after the reaction is finished, filtering and drying the product in an oven to obtain the cationic polyelectrolyte sludge dehydrating agent. The invention has the advantages of safe and simple preparation method, low cost, convenient storage and transportation, no acrylamide produced in the degradation process and no secondary pollution.
Description
Technical Field
The invention relates to the field of preparation of water-soluble functional high molecular compounds, in particular to a cationic polyelectrolyte type sludge dehydrating agent, and a preparation method and application thereof.
Background
With the increasing severity of water pollution and the gradual improvement of environmental awareness of people, china builds a large number of sewage treatment plants to carry out centralized treatment on industrial wastewater and urban domestic sewage, greatly improves the treatment rate of the industrial wastewater and the domestic sewage, and reduces the pollution of the industrial wastewater and the domestic sewage to natural water. At the same time, the production of sludge, which is a by-product of sewage treatment in sewage treatment plants, is also dramatically increased. The sludge is used as a product in the sewage treatment process, has very complex composition components, and comprises a large amount of solid particles such as silt, animal and plant residues and the like trapped in the industrial wastewater or domestic sewage treatment process, a large amount of zooglea consisting of microbial communities and organic matters adsorbed by the zooglea, and other toxic and harmful substances such as heavy metal elements, parasitic ova, a small amount of pathogenic microorganisms and the like. If the sludge directly enters the natural environment without effective treatment, the sludge can cause serious pollution to the natural environment. On the other hand, since the sludge contains a large amount of water, and the water content is generally as high as 97.5% to 99.5%, the volume of the sludge is very large, which causes great difficulty in subsequent treatment processes and transportation and greatly increases treatment cost, and therefore, the sludge must be dewatered to reduce the volume of the sludge.
The commonly used sludge dehydrating agents comprise an inorganic sludge dehydrating agent, an organic polymer sludge dehydrating agent, a composite sludge dehydrating agent, a biological sludge dehydrating agent and the like, cationic Polyacrylamide (CPAM) is one of the organic polymer sludge dehydrating agents and is the most widely used sludge dehydrating agent at present, and patent CN176922 1A discloses a cationic sludge dehydrating agent, a plurality of organic play components of formaldehyde, organic amine and the like are adopted, so the sludge dehydrating agent is not friendly to human and environment, and the sludge treatment effect is not obvious. Patent CN 104261651A discloses a modified cationic polyacrylamide sewage treatment agent, which has better dehydration effect than the traditional polyacrylamide dehydrating agent, but the dehydration rate is still about 70%. Patent CN101 172748A discloses a compound sludge dehydrating agent, which can only control the dehydrating rate to be about 72% when being used after being compounded with other patent products, and the process is relatively complicated; the ionic dispersants used in the sludge dewatering agent disclosed in patent CN101100345A are up to 5, and the filtrate causes secondary pollution. In addition, although the literature 'test of graft copolymerization and flocculation property of acrylamide and D-fructose-acrylamide derivatives' mentions that crosslinking agents such as MBA can be used, the grafting rate is low during grafting, and it is difficult to achieve the desired application effect. Patent CN112480310A discloses a method for preparing cross-linked cationic polyacrylamide sludge, the water content of the sludge can be reduced to below 70%, but the sludge dewatering agent still belongs to Cationic Polyacrylamide (CPAM), although it has good sludge dewatering effect, it is difficult to degrade under natural conditions, and the Acrylamide Monomer (AM) produced by slow degradation is also a highly toxic substance with neurotoxicity, which causes secondary pollution to the environment.
Most of solid particles forming the sludge are colloid particles which usually have negative charges and have strong hydrophilicity, the shapes of the particles are fine and uneven, the specific surface area is large, the particles are mutually repelled and stably exist due to electrostatic repulsion, and the colloid particles and water have strong binding force, so that the moisture in the sludge is difficult to remove, and the sludge dewatering performance is poor.
Disclosure of Invention
The invention provides a cationic polyelectrolyte type sludge dehydrating agent, which aims to solve the problems that the sludge dehydrating agent prepared by the conventional method has common sludge dehydrating performance and is easy to cause secondary pollution, and provides a preparation method with simple steps and low cost.
In order to solve the problems, the invention provides a preparation method of a cationic polyelectrolyte type sludge dehydrating agent, which comprises the following steps:
s1: preparing a water phase: dissolving acrylamide solid with water, adding cationic ester polymerization monomer and cationic amide polymerization monomer, and mixing at 40-45 deg.C to obtain water solution; preparing an initiator, adding the initiator into the monomer aqueous solution, and uniformly mixing to obtain a water phase; the initiator is one or more of ammonium persulfate, 2' -azobisisobutyl ether dihydrochloride and azo diisopropyl imidazoline hydrochloride;
preparing an oil phase: adding a surfactant sorbitan monostearate, sorbitan fatty acid ester, an initiator azobisisobutyronitrile and cyclohexane and/or methylcyclohexane of which the volume is 1-3 times that of the water phase into a reaction vessel provided with a stirrer, a condenser pipe and a nitrogen guide pipe to prepare an oil phase;
s2: polymerization reaction: respectively carrying out nitrogen deoxidization on the water phase and the oil phase obtained in the step S1, heating the temperature of the oil phase to 40-45 ℃ under the protection of nitrogen, then dripping the water phase into the oil phase at the speed of 1-10mL/min by using an injection pump, stirring the liquid, after the water phase is added, preserving the heat at the temperature of 40-45 ℃ for 0.5-1h, then heating to 60-70 ℃, preserving the heat at the temperature for 2-4h, finally heating to 75-80 ℃, continuing to react for 0.5-1h, and finishing the reaction;
s3: and (3) post-treatment: after the reaction is finished, the product is filtered and dried by a Buchner funnel and dried in a hot air oven at the temperature of 60-65 ℃ to obtain the cationic polyelectrolyte sludge dehydrating agent.
Preferably, in step S1, the cationic amide-based polymeric monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride or (3-acrylamidopropyl) trimethyl ammonium chloride; the cationic ester polymerization monomer is methacryloyloxyethyl trimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride.
As a preferable scheme, when the cationic amide polymerization monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride and the cationic ester polymerization monomer is acryloyloxyethyl trimethyl ammonium chloride, the reaction process of the preparation method is as follows:
preferably, the weight ratio of the cationic amide polymerization monomer to the cationic ester polymerization monomer is (5-95): (95-5), the total solubility of the cationic amide polymerization monomer and the cationic ester polymerization monomer in the aqueous solution is 1-5g/ml, and the mass of the initiator is 0.5% -2% of the total mass of the cationic amide polymerization monomer and the cationic ester polymerization monomer.
Preferably, the organic solvent is 1 to 3 times the volume of the aqueous dispersant.
Preferably, in the step S1, the weight ratio of the sorbitan monostearate to the sorbitan fatty acid ester is (1-4): (4-1).
Preferably, in the step S2, the rotation speed of the stirring is 100 to 600r/min.
Preferably, the method further comprises, after obtaining the sludge-dewatering agent: and (3) separating the solution remaining in the reaction to obtain a water phase and an oil phase, and reusing the water phase and the oil phase in the step S2.
The preparation method adopts water-in-oil reversed-phase suspension polymerization, adopts multi-step temperature rise to control the polymerization speed, and important control steps comprise placing different types of initiators in different reaction phases to ensure the maximum dispersion of the initiators; the initial temperature of the system is set at 40-45 ℃, the dosage and the temperature of the initiator are controlled, and the polymerization volume of the water-in-oil reversed phase suspension polymerization is well controlled, so that the coordination effect of the composite initiator is greatly improved.
The invention aims to solve one technical problem of providing the sludge dehydrating agent prepared by the method, and the sludge dehydrating agent has better dehydrating performance and cannot cause secondary pollution.
In order to solve the above problems, the present invention provides a cationic polyelectrolyte type sludge-dewatering agent prepared by any one of the above preparation methods.
The invention also provides an application of the cationic polyelectrolyte sludge dehydrating agent, which aims to solve the problems that the conventional sludge dehydrating agent is easy to cause secondary pollution when applied to sludge and sewage and has general dehydration performance.
In order to solve the above problems, the present invention provides an application of a cationic polyelectrolyte type sludge-dewatering agent, comprising applying the cationic polyelectrolyte type sludge-dewatering agent to dewatering of industrial sludge.
In order to solve the problems, the invention utilizes a reverse suspension polymerization method to prepare the cationic polyelectrolyte type sludge dehydrating agent by taking ester cationic polymerization monomers and amide cationic polymerization monomers as main raw materials, and the molecular weight and the polymerization mode of the cationic polyelectrolyte are effectively regulated and controlled by accurately regulating and controlling the reaction micro-environment cavity of the monomers in the polymerization process, so as to control the physical form of the cationic polyelectrolyte type sludge dehydrating agent product and obtain the microbead-shaped cationic polyelectrolyte product with the diameter of 0.8-1.5mm, which is easy to disperse. The microbead-like cationic polyelectrolyte avoids the phenomenon of water agglomeration, can greatly increase the dissolution speed of the microbead-like cationic polyelectrolyte in water, simultaneously solves the key technical problem that the fluidized drying bed is dead bed phenomenon caused by the adhesion of high-content cationic group particles in the fluidized bed drying section after the granulation of the gel block in the traditional water dispersion polymerization process of the cationic polyelectrolyte, and is beneficial to the large-scale commercial application.
Drawings
FIG. 1 is a schematic view of a sample of a sludge-dewatering agent of cationic polyelectrolyte type;
FIG. 2 is a schematic view of an enlarged structure of a sample of a cationic polyelectrolyte type sludge-dewatering agent by a microscope.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a cationic polyelectrolyte type sludge dehydrating agent, a preparation method and application thereof, wherein the preparation method comprises the following steps:
s1: preparation of an aqueous phase: dissolving acrylamide solid with water, adding cationic ester polymerization monomer and cationic amide polymerization monomer, and mixing at 40-45 deg.C to obtain water solution; preparing an initiator, adding the initiator into the monomer aqueous solution, and uniformly mixing to obtain a water phase; the initiator is one or more of ammonium persulfate, 2' -azobisisobutyl ether dihydrochloride and azodiisopropyl imidazoline hydrochloride;
preparing an oil phase: adding a surfactant sorbitan monostearate, a sorbitan fatty acid ester, an initiator azobisisobutyronitrile and cyclohexane and/or methylcyclohexane with the volume 1-3 times that of the water phase into a reaction vessel provided with a stirrer, a condensation pipe and a nitrogen guide pipe to prepare an oil phase;
s2: polymerization reaction: respectively carrying out nitrogen deoxygenation on the water phase and the oil phase obtained in the step S1, heating the temperature of the oil phase to 40-45 ℃ under the protection of nitrogen, then dripping the water phase into the oil phase at the speed of 1-10mL/min by using an injection pump, stirring the liquid, after the addition of the water phase is finished, preserving the heat for 0.5-1h at the temperature of 40-45 ℃, then heating to 60-70 ℃, preserving the heat for 2-4h at the temperature, finally heating to 75-80 ℃, continuing to react for 0.5-1h, and finishing the reaction;
s3: and (3) post-treatment: and after the reaction is finished, filtering and drying the product by using a Buchner funnel, and drying in a hot air oven at 60-65 ℃ to obtain the cationic polyelectrolyte sludge dehydrating agent.
Preferably, in step S1, the cationic amide-based polymeric monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride or (3-acrylamidopropyl) trimethyl ammonium chloride; the cationic ester polymerization monomer is methacryloyloxyethyl trimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride.
As a preferable scheme, when the cationic amide polymerization monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride and the cationic ester polymerization monomer is acryloyloxyethyl trimethyl ammonium chloride, the reaction process of the preparation method is as follows:
preferably, the weight ratio of the cationic amide polymerization monomer to the cationic ester polymerization monomer is (5-95): (95-5), the total solubility of the cationic amide polymerization monomer and the cationic ester polymerization monomer in the aqueous solution is 1-5g/ml, and the mass of the initiator is 0.5% -2% of the total mass of the cationic amide polymerization monomer and the cationic ester polymerization monomer.
Preferably, the organic solvent is 1 to 3 times the volume of the aqueous dispersant.
Preferably, in the step S1, the weight ratio of the sorbitan monostearate to the sorbitan fatty acid ester is (1-4): (4-1).
Preferably, in the step S2, the rotation speed of the stirring is 100 to 600r/min.
Preferably, the method further comprises, after obtaining the sludge-dewatering agent: and (3) separating the solution remaining in the reaction to obtain a water phase and an oil phase, and reusing the water phase and the oil phase in the step S2.
The sludge dehydrating agent is prepared by the preparation method.
The invention also provides an application of the cationic polyelectrolyte type sludge dehydrating agent, which comprises the step of applying the cationic polyelectrolyte type sludge dehydrating agent to dehydration of industrial sludge.
The following description will be made by combining specific experimental data, experimental conditions and experimental equipment to describe the above technical scheme:
example 1
S1: preparation of an aqueous phase: weighing 14.5g of 2.5g of 3- (methacrylamido) propyl trimethyl ammonium chloride (MA PTAC), 2.5g of cationic monomer acryloyloxyethyl trimethyl ammonium chloride (DAC), dissolving in 50ml of deionized water at 40-45 ℃ to form a transparent monomer aqueous solution, adding 0.015g of initiator V-50 (2, 2' -azobisisobutyl ether dihydrochloride) and ammonium persulfate (weight ratio is 1: 1), and uniformly mixing to prepare a water phase;
preparing an oil phase: weighing 0.80g of emulsifier Span-60 (sorbitan monostearate), 0.80g of emulsifier Span-80 (sorbitan fatty acid ester) and 0.20g of initiator V60 (azobisisobutyronitrile), putting the mixture into a 500mL four-neck round-bottom flask provided with a mechanical stirrer, a condenser pipe and a nitrogen guide pipe, adding 200mL of cyclohexane, introducing condensed water, starting stirring, heating to 45 ℃ until the emulsifier and the initiator are completely dissolved, and forming a transparent oil phase;
s2: polymerization reaction: respectively carrying out nitrogen deoxidization on two systems (water phase and oil phase), uniformly stirring in a constant-temperature water bath at 45 ℃ in a four-neck round-bottom flask (the stirring speed is 150 r/min), introducing nitrogen to remove 30 min, slowly injecting the water phase into the oil phase at the speed of 2ml/min by using an injection pump, introducing condensed water, keeping the reaction temperature at 45 ℃ at the beginning, stirring for 0.5-1h, quickly heating to 65 ℃, reacting for 3h at the temperature, heating to 75 ℃, continuing to react for 0.5h until the reaction is finished, and keeping the stirring speed constant in the whole reaction process, wherein the stirring speed is 150r/min;
s3: and (3) post-treatment: after the reaction is finished, stopping stirring, settling the granular polymer to the bottom of the flask, filtering the product by using a Buchner funnel, and drying the product in a hot air oven at 60 ℃ to obtain a beaded sludge dewatering agent Poly (MAPTAC-DAC) with the diameter of 1.4 +/-0.2 mm and the solid content of 88 percent.
Example 2
The same procedures as in example 1 were repeated except that the cationic monomer in the aqueous phase preparation step was changed from 2.5g of the cationic monomer acryloyloxyethyltrimethylammonium chloride (DAC) in example 1 to 2.7g of methacryloyloxyethyltrimethylammonium chloride (DM C), to obtain sludge-dewatering agent Poly (M APTAC-DMC) having a diameter of 1.2. + -. 0.2mm in a bead shape and a solid content of 90%.
Example 3
The same procedures as in example 1 were repeated except that the amount of the initiator used in the aqueous phase preparation step was changed to V-50 and 0.03g (weight ratio: 1) based on ammonium persulfate to obtain sludge-dewatering agent Poly (MAPTAC-DAC) in the form of beads having a diameter of 1.3. + -. 0.2mm and a solid content of 88%.
Example 4
The same procedures as in example 3 were repeated except that the amount of the initiator used in the aqueous phase preparation step was changed to 0.03g (1: 1 weight ratio) based on VA044 (azobisisopropylimidazoline hydrochloride) and V50, to obtain sludge dewatering agent Poly (MAPTAC-DAC) in the form of beads having a diameter of 1.3. + -. 0.2mm and a solid content of 90%.
FIG. 1 and FIG. 2 are a sample schematic view and a microscope magnification structural schematic view of a cationic polyelectrolyte type sludge-dewatering agent according to the present invention.
The performance test method and the test equipment of the sludge dewatering agent have the following conditions:
(I) sample preparation
1. Experimental sludge: activated sludge sample of a water treatment tank of a certain pharmaceutical factory, sludge index characteristics: water content: 98.5%, sludge specific resistance SRF: 15.33X 10 13 /m·kg -1 。
2. Experimental drugs: (1) the cationic polyelectrolyte type sludge-dewatering agent products prepared in examples 1 to 4, (2) other products in the same industry: comparative example 1-cationic polyacrylamide type sludge dewatering agent GPAM1 from A, comparative example 2-cationic polyacrylamide type sludge dewatering agent G PAM2 from B, and comparative example 3-cationic polyacrylamide type sludge dewatering agent XY8163 from Xin.
3. Dissolution concentration of experimental drug: 0.2 percent.
4. An experimental instrument: JJ-4A six-connection electric stirrer, sludge specific resistance measuring device and 202-0A electric heating constant temperature drying box
(II) sample test
Performance testing of sludge dewatering Agents
Firstly, preparing a sludge dehydrating agent into a 0.2% solution, firstly taking 200ml of a sludge water sample, adding a sludge dehydrating agent solution, slowly stirring for 90s (50 r/min), after stirring is finished, putting a sample into a sludge specific resistance measuring device, and measuring the performance parameters of the sludge dehydrating agent: sludge moisture content and sludge Specific Resistance (SRF) sludge dehydrating agent dosage: 35mg/L;
the test results are shown in table 1:
TABLE 1 Performance parameters of the products of examples 1 to 4 and comparative example
The data in the above table show that the moisture content of the sludge and the specific resistance of the sludge are obviously reduced by using the sludge dehydrating agent manufactured by the embodiment of the invention.
Through the comparison of the experiments of the above examples 1 to 4 with the comparative examples, it is further demonstrated that the cationic polyelectrolyte sludge-dewatering agent obtained by the present invention has better sludge dewatering performance than similar cationic polyacrylamide enhancers under the same dosage.
The prior sludge dewatering agent technology is a production method of a cationic polyacrylamide aqueous dispersion polymerization method, and the application is obviously different from the prior technical invention and mainly comprises the following steps: the reverse phase suspension polymerization is adopted, the dosage and the system of an initiator are controlled, a water phase is added into an oil phase by using an injection pump, so that local supersaturation is avoided, the polymerization can be carried out stably and controllably at a certain temperature, and simultaneously, the characteristics of water-in-oil are utilized, and a micro polymerization unit with controllable volume is obtained by using the stirring speed and a dispersing agent to form bead-shaped cationic polyelectrolyte. Cationic amide polymerization monomers and cationic ester polymerization monomers with good performance are selected for copolymerization, and a beaded sludge dewatering agent solid product with good performance is obtained.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. A preparation method of a cationic polyelectrolyte type sludge dehydrating agent is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing a water phase: dissolving acrylamide solid with water, adding cationic ester polymerization monomer and cationic amide polymerization monomer, and mixing at 40-45 deg.C to obtain water solution; preparing an initiator, adding the initiator into the monomer aqueous solution, and uniformly mixing to obtain a water phase; the initiator is one or more of ammonium persulfate, 2' -azobisisobutyl ether dihydrochloride and azo diisopropyl imidazoline hydrochloride;
preparing an oil phase: adding a surfactant sorbitan monostearate, a sorbitan fatty acid ester, an initiator azobisisobutyronitrile and cyclohexane and/or methylcyclohexane with the volume 1-3 times that of the water phase into a reaction vessel provided with a stirrer, a condensation pipe and a nitrogen guide pipe to prepare an oil phase;
s2: polymerization reaction: respectively carrying out nitrogen deoxygenation on the water phase and the oil phase obtained in the step S1, heating the temperature of the oil phase to 40-45 ℃ under the protection of nitrogen, then dripping the water phase into the oil phase at the speed of 1-10mL/min by using an injection pump, stirring the liquid, after the addition of the water phase is finished, preserving the heat for 0.5-1h at the temperature of 40-45 ℃, then heating to 60-70 ℃, preserving the heat for 2-4h at the temperature, finally heating to 75-80 ℃, continuing to react for 0.5-1h, and finishing the reaction;
s3: and (3) post-treatment: after the reaction is finished, the product is filtered and dried by a Buchner funnel and dried in a hot air oven at the temperature of 60-65 ℃ to obtain the cationic polyelectrolyte sludge dehydrating agent.
2. The method for preparing a cationic polyelectrolyte-type sludge-dewatering agent according to claim 1, wherein: in the step S1, the cationic amide-based polymeric monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride or (3-acrylamidopropyl) trimethyl ammonium chloride; the cationic ester polymerization monomer is methacryloyloxyethyl trimethyl ammonium chloride or acryloyloxyethyl trimethyl ammonium chloride.
3. The method for preparing the cationic polyelectrolyte type sludge-dewatering agent according to claim 2, wherein: when the cationic amide polymerization monomer is [3- (methacrylamido) propyl ] trimethyl ammonium chloride and the cationic ester polymerization monomer is acryloyloxyethyl trimethyl ammonium chloride, the reaction process of the preparation method is as follows:
4. the method for preparing a cationic polyelectrolyte-type sludge-dewatering agent according to claim 1, wherein: the weight ratio of the cationic amide polymerization monomer to the cationic ester polymerization monomer is (5-95): (95-5), the total solubility of the cationic amide polymerization monomer and the cationic ester polymerization monomer in the aqueous solution is 1-5g/ml, and the mass of the initiator is 0.5% -2% of the total mass of the cationic amide polymerization monomer and the cationic ester polymerization monomer.
5. The method for preparing a cationic polyelectrolyte-type sludge-dewatering agent according to claim 1, wherein: the volume of the organic solvent is 1 to 3 times of that of the aqueous dispersant.
6. The method for preparing the cationic polyelectrolyte type sludge-dewatering agent according to claim 1, wherein: in the step S1, the weight ratio of the sorbitan monostearate to the sorbitan fatty acid ester is (1-4): (4-1).
7. The method for preparing a cationic polyelectrolyte-type sludge-dewatering agent according to claim 1, wherein: in the step S2, the rotating speed of the stirring is 100-600r/min.
8. The method for preparing a cationic polyelectrolyte-type sludge-dewatering agent according to claim 1, wherein: in the step S3, after obtaining the sludge-dewatering agent, the method further includes: and (3) separating the solution remaining in the reaction to obtain a water phase and an oil phase, and reusing the water phase and the oil phase in the step S2.
9. A cationic polyelectrolyte type sludge-dewatering agent, characterized in that it is produced by the production method according to any one of claims 1 to 8.
10. Use of a cationic polyelectrolyte-type sludge-dewatering agent, comprising applying the cationic polyelectrolyte-type sludge-dewatering agent of claim 9 to dewatering of industrial sludge.
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|---|---|---|---|---|
| JP2003041137A (en) * | 2001-07-26 | 2003-02-13 | Hymo Corp | Water-soluble polymer dispersion and method for producing the same |
| JP2010053234A (en) * | 2008-08-28 | 2010-03-11 | Hymo Corp | Powdered ionic water-soluble polymer and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003041137A (en) * | 2001-07-26 | 2003-02-13 | Hymo Corp | Water-soluble polymer dispersion and method for producing the same |
| JP2010053234A (en) * | 2008-08-28 | 2010-03-11 | Hymo Corp | Powdered ionic water-soluble polymer and application thereof |
| CN109293827A (en) * | 2018-09-26 | 2019-02-01 | 浙江鑫甬生物化工股份有限公司 | The preparation method of pearl cationic polyacrylamide class retention agent and its retention application to pulp |
| CN109824819A (en) * | 2019-01-18 | 2019-05-31 | 湖北康创科技有限公司 | A kind of inverted polymer lotion of cross-linked structure and its application in sludge dewatering |
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| Title |
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| 冯大春 等: "AM／AQ的反相悬浮共聚合", 《中国矿业大学学报》, vol. 30, no. 6, 30 November 2001 (2001-11-30), pages 624 - 626 * |
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