CN111992054A - Variable-tension winding roller and method for processing non-equal-diameter hollow fiber membrane - Google Patents

Abstract

The present invention relates to a variable tension winding roller and a method for processing an unequal diameter hollow fiber membrane. The variable tension winding roller includes a winding roller body, and the winding roller body is three or more arc-shaped convex It is an irregular shape formed by connecting the edges in sequence, and the middle position of each arc-shaped convex edge is convex and the two sides are symmetrically distributed about the middle position. The method for processing the non-equal diameter hollow fiber membrane is as follows: preparation of a casting solution; adding the casting solution into the hollow fiber membrane spinning machine for spinning, and converting from a liquid phase to a solid phase through an air bath, a coagulation bath and a cleaning bath, The circular winding roller is wound, and then wound through the body of the winding roller to periodically change the spinning tension, so that the diameter of the hollow fiber membrane changes periodically along its length direction; slitting. In the present invention, the spinning tension is periodically changed during the spinning and winding by changing the tension of the winding roller body, so that the diameter of the hollow fiber membrane changes periodically along the length direction, thereby obtaining an unequal diameter hollow fiber membrane, which is more convenient to process and more efficient. high.

Description

A kind of variable tension winding roller and method for processing unequal diameter hollow fiber membrane

technical field

The present invention relates to the technical field of membrane separation components, in particular to a variable tension winding roll and a method for processing non-equal diameter hollow fiber membranes.

Background technique

During the use of traditional hollow fiber membranes, due to pressure loss, the pollution of the first half of the membrane is more serious than that of the second half of the membrane, the efficient utilization of the second half of the membrane cannot be achieved, and the phenomenon of concentration polarization is serious. In order to solve such problems, the non-equal diameter hollow fiber membrane was invented, which can alleviate the problem of uneven membrane fouling, and realize efficient utilization of the second half of the membrane, which is conducive to alleviating the phenomenon of concentration polarization in the cavity of the hollow fiber membrane and reducing the membrane pollution. pollution, and prolong the cleaning cycle and service life of hollow fiber membrane modules.

In the preparation method of the non-equal diameter hollow fiber membrane, the non-equal diameter hollow fiber membrane can be prepared by using the mechanical control to move the winding roller up and down, but there is a problem that the mechanical control complicates the process.

SUMMARY OF THE INVENTION

The present invention aims to solve the deficiencies of the prior art, and provides a variable tension winding roller and a method for processing an unequal diameter hollow fiber membrane.

The present invention adopts the following technical solutions to achieve the above object:

A variable tension winding roller, comprising a winding roller body, the winding roller body is an irregular shape composed of three or more arc-shaped convex edges connected in sequence, and the middle position of each arc-shaped convex edge protrudes And the two sides are symmetrically distributed about the middle position.

In particular, all the arc-shaped ridges that make up the body of each winding roll are of the same shape.

The number of arc-shaped convex edges of the winding roller body is three.

In particular, when the number of arc-shaped ridges constituting each winding roller body is even, the two opposite arc-shaped ridges have the same shape and the same length, and the two adjacent arc-shaped ridges are inconsistent in shape.

The number of arc-shaped convex edges of the winding roller body is four.

A method for processing non-equal diameter hollow fiber membranes using the above-mentioned variable tension winding roller, the specific steps are:

S1. Preparation of casting solution

Adding the film casting liquid matrix into the polymer solvent, mixing uniformly and filtering through a filter to obtain the film casting liquid;

S2. Preparation of non-isodiametric hollow fiber membranes

The film casting liquid obtained in step S1 was added to the feed liquid kettle of the hollow fiber membrane spinning machine equipment by a metering pump, and was allowed to stand at 80 ° C for defoaming for 12 hours, and then nitrogen was introduced into the feed liquid kettle to the pressure in the kettle. Maintained at 0.4MPa, the casting liquid enters the coagulation bath through the air bath, the cleaning bath is converted from the liquid phase to the solid phase, and is wound through a circular winding roller, and then wound through the winding roller body. Periodically change the spinning tension, so that the diameter of the hollow fiber membrane periodically changes along its length;

S3. Slitting

The periodically changing hollow fiber membranes produced in step S2 are divided into non-equal diameter fiber membranes according to their period lengths.

In step S1, the casting liquid matrix is prepared by using a molding polymer material or a plurality of molding polymer materials, wherein the molding polymer materials are polyvinylidene fluoride, polysulfone, polysulfone, polyether One of sulfone, polyvinyl chloride, polyacrylonitrile, polyvinylpyrrolidone, and polymetaphenylene isophthalamide.

In step S1, the polymer solvent is one solvent or a mixture of multiple solvents among dimethylformamide, dimethylacetamide, glycerol, CaCl ₂ , and triethyl phosphate.

In step S2, the liquid in the coagulation bath and the cleaning bath is one of water, acid solution, alkali solution and organic solution.

An internal pressure type non-equal diameter hollow fiber membrane module, comprising a hollow fiber membrane shell, one end of the hollow fiber membrane shell is provided with a water inlet and the other end is provided with a concentrated water outlet, and the hollow fiber membrane shell has a water inlet. There are several water purification outlets on the side wall, the hollow fiber membrane shell is encapsulated with a bundle composed of non-equal diameter hollow fiber membranes, and the larger diameter end of the non-equal diameter hollow fiber membrane bundle is located at the inlet. One end of the water outlet and the end with a smaller diameter is located at one end of the concentrated water outlet.

The beneficial effects of the present invention are: the present invention periodically changes the spinning tension during spinning and winding through the variable tension winding roller body, so that the diameter of the hollow fiber membrane periodically changes along the length direction, thereby obtaining an unequal diameter hollow fiber membrane , the processing is more convenient and the efficiency is higher.

Description of drawings

Figure 1 is a schematic diagram of the structure of a winding roller body with three arc-shaped convex edges;

Figure 2 is a schematic diagram of the structure of a winding roller body with four identical arc-shaped convex edges;

3 is a schematic diagram of the structure of a winding roller body having four arc-shaped ridges, two opposite arc-shaped ridges having the same shape, and two adjacent arc-shaped ridges having inconsistent shapes;

Figure 4 is a diagram of a device for processing non-equal diameter hollow fiber membranes using variable tension winding rolls;

Fig. 5 is the schematic diagram of the unequal diameter hollow fiber membrane that adopts the variable tension winding roller to process;

Figure 6 is a schematic structural diagram of an internal pressure type non-equal diameter hollow fiber membrane module;

In the figure: 1-winding roller body; 2-curved edge; 3-filter; 4-metering pump; 5-hollow fiber membrane spinning machine equipment; 6-coagulation bath; 7-cleaning bath; 8-circle shaped winding roller;

The following will be described in detail with reference to the accompanying drawings in conjunction with the embodiments of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

As shown in Fig. 1 to Fig. 5, a variable tension winding roller includes a winding roller body 1, and the winding roller body 1 is an irregular formed by connecting three or more arc-shaped convex edges 2 in sequence The middle position of each arc-shaped convex edge 2 is convex and the two sides are symmetrically distributed with respect to the middle position.

In particular, all the arc-shaped flanges 2 constituting each winding roll body 1 have the same shape.

The number of arc-shaped convex edges 2 of the winding roller body 1 is three.

In particular, when the number of arc-shaped convex sides 2 constituting each winding roller body 1 is an even number, the two opposite arc-shaped convex sides 2 have the same shape and the same length, and the adjacent two arc-shaped convex sides 2 have the same shape and the same length. inconsistent.

The number of arc-shaped convex edges 2 of the winding roller body 1 is four.

A method for processing non-equal diameter hollow fiber membranes using the above-mentioned variable tension winding roller, the specific steps are:

S1. Preparation of casting solution

Adding the film casting liquid matrix into the polymer solvent, mixing uniformly and filtering through the filter 3 to obtain the film casting liquid;

S2. Preparation of non-isodiametric hollow fiber membranes

The film casting liquid obtained in step S1 was added to the feed liquid kettle of the hollow fiber membrane spinning machine equipment 5 by the metering pump 4, and was allowed to stand for degassing at 80 ° C for 12 hours, and then nitrogen was introduced into the feed liquid kettle to the kettle. The medium pressure is maintained at 0.4MPa, the casting liquid enters the solidification bath 6 through the air bath, the cleaning bath 7 is converted from the liquid phase to the solid phase, and is wound by the circular winding roller 8, and then is wound by the winding roller body 1, Periodically changing the spinning tension during spinning and winding, so that the diameter of the hollow fiber membrane periodically changes along its length direction;

S3. Slitting

The periodically changing hollow fiber membranes produced in step S2 are divided into non-equal diameter fiber membranes according to their period lengths.

In step S1, the casting liquid matrix is prepared by using a molding polymer material or a plurality of molding polymer materials, wherein the molding polymer materials are polyvinylidene fluoride, polysulfone, polysulfone, polyether One of sulfone, polyvinyl chloride, polyacrylonitrile, polyvinylpyrrolidone, and polymetaphenylene isophthalamide.

In step S1, the polymer solvent is one solvent or a mixture of multiple solvents among dimethylformamide, dimethylacetamide, glycerol, CaCl ₂ , and triethyl phosphate.

In step S2, the liquid in the coagulation bath 6 and the cleaning bath 7 is one of water, acid solution, alkali solution and organic solution.

In the present invention, if all the arc-shaped flanges 2 constituting each winding roller body 1 are the same, as shown in Figures 1 and 2, it is convenient to process the non-equal diameter fiber film of the same type and the same length. At this time, it is only necessary to control the length of each arc-shaped convex edge 2 to be twice the length of the non-equal diameter fiber film to be processed. If the side length of the winding roller body 1 is n, then the winding roller body 1 rotates once. , 2n non-equal diameter fiber membranes of the same length can be produced.

In the present invention, if the shapes of the adjacent two arc-shaped convex edges 2 that make up each winding roller body 1 are inconsistent, but the two opposite arc-shaped convex edges 2 are consistent, as shown in FIG. 3 , it can be processed. A variety of models and different lengths of non-equal diameter fiber membranes, so that every two opposite arc-shaped convex edges 2 can produce the same type of non-equal diameter fiber membranes. Divide.

An internal pressure type non-equal diameter hollow fiber membrane module, as shown in Figure 6, includes a hollow fiber membrane shell, one end of the hollow fiber membrane shell is provided with a water inlet and the other end is provided with a concentrated water outlet, the The side wall of the hollow fiber membrane shell is provided with several water purification outlets, and the hollow fiber membrane shell is encapsulated with a bundle composed of non-equal diameter hollow fiber membranes. The larger diameter end is located at the water inlet end and the smaller diameter end is located at the concentrated water outlet end.

In the present invention, through the variable tension winding roller body 1, the spinning tension is periodically changed during spinning and winding, so that the diameter of the hollow fiber membrane periodically changes along the length direction, thereby obtaining an unequal diameter hollow fiber membrane, and the processing is more convenient and efficient. higher. The application of non-equal diameter hollow fiber membrane in the membrane module device can alleviate the problem of uneven membrane fouling, and achieve efficient utilization of the second half of the membrane, which is conducive to alleviating the phenomenon of concentration polarization in the hollow fiber membrane cavity and reducing membrane fouling , prolong the cleaning cycle and service life of hollow fiber membrane modules.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various improvements made by the method concept and technical solution of the present invention are adopted, or it is directly applied to other It is within the protection scope of the present invention.

Claims (10)

1. The utility model provides a become tension winding up roller, its characterized in that includes winding up roller body (1), winding up roller body (1) is the irregular shape that three or more than three arc chimb (2) connect gradually and constitute, and every arc chimb (2) intermediate position protrusion and both sides are about the intermediate position symmetric distribution.

2. A variable tension winding roller according to claim 1, characterized in that all the arched convex edges (2) constituting each winding roller body (1) are identical in shape.

3. A variable tension winding roller according to claim 2, characterized in that the number of the curved flanges (2) of the winding roller body (1) is three.

4. A variable tension winding roller according to claim 1, characterized in that when the number of the arc-shaped flanges (2) constituting each winding roller body (1) is even, two opposite arc-shaped flanges (2) have the same shape and the same length, and two adjacent arc-shaped flanges (2) have different shapes.

5. A variable tension winding roller according to claim 4, characterized in that the number of the curved flanges (2) of the winding roller body (1) is four.

6. A method for processing a non-uniform-diameter hollow fiber membrane by using the variable-tension winding roller as claimed in any one of claims 1 to 5 is characterized by comprising the following specific steps:

s1 preparation of casting solution

Adding the membrane casting solution matrix into a polymer solvent, uniformly mixing, and filtering through a filter (3) to obtain a membrane casting solution;

s2 preparation of non-isodiametric hollow fiber membrane

Adding the casting solution obtained in the step S1 into a feed liquid kettle of a hollow fiber membrane spinning machine device (5) by a metering pump (4), standing and defoaming for 12h at 80 ℃, introducing nitrogen into the feed liquid kettle until the pressure in the kettle is kept at 0.4MPa, introducing the casting solution into a coagulating bath (6) and a cleaning bath (7) through an air bath, converting a liquid phase into a solid phase, winding through a circular winding roller (8), and then winding through a winding roller body (1), wherein the spinning tension is periodically changed during spinning winding so that the diameter of the hollow fiber membrane is periodically changed along the length direction of the hollow fiber membrane;

s3, slitting

The periodically varying hollow fiber membrane produced in step S2 is cut into a non-uniform diameter fiber membrane having a large diameter at one end and a small diameter at the other end according to the periodic length.

7. The method for processing the hollow fiber membrane with the unequal diameter by the variable-tension winding roller according to claim 6, wherein in step S1, the casting solution matrix is prepared by one or more molding polymer materials, wherein the molding polymer material is one of polyvinylidene fluoride, polysulfone, polyethersulfone, polyvinyl chloride, polyacrylonitrile, polyvinyl pyrrolidone and polyisophthaloyl metaphenylene diamine.

8. The method of claim 7, wherein in step S1, the polymer solvent is dimethylformamide, dimethylacetamide, glycerol, CaCl₂And triethyl phosphate or a mixture of a plurality of solvents.

9. The method for processing hollow fiber membrane with unequal diameters by using the variable tension winding roll according to claim 8, wherein in step S2, the liquid in the coagulating bath (6) and the cleaning bath (7) is one of water, acid solution, alkali solution and organic solution.

10. The internal pressure type non-isometric hollow fiber membrane module is characterized by comprising a hollow fiber membrane shell, wherein one end of the hollow fiber membrane shell is provided with a water inlet, the other end of the hollow fiber membrane shell is provided with a concentrated water outlet, the side wall of the hollow fiber membrane shell is provided with a plurality of purified water outlets, a bundle body formed by non-isometric hollow fiber membranes is sealed in the hollow fiber membrane shell, and the larger diameter end of the non-isometric hollow fiber membrane bundle body is located at one end of the water inlet and the smaller diameter end of the non-isometric hollow fiber membrane bundle body is located at one end of the concentrated water outlet.

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