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Hollow fiber compound film, preparation and application

A fiber composite and hollow technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high energy consumption, long process flow, complicated refining system, etc., and achieve simple preparation process and rich raw material sources. , the effect of high separation performance

Inactive Publication Date: 2008-09-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This dehydration process has the following disadvantages: (1) energy consumption is high
The water content of the gas entering the adsorption tower is high, the adsorbent needs to be regenerated frequently, and the energy consumption of the regeneration process is high
(2) Large waste of propylene (3) High replacement cost of silica gel and molecular sieve
[0004] (4) The refining system is complicated, the process flow is long, and the investment is large
Improving membrane dehumidification performance by introducing ethylenediaminetetramethylenephosphonic acid (EDTMPA) into PVA has not been reported

Method used

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  • Hollow fiber compound film, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation of embodiment 1 PVA-EDTMPA / PS hollow fiber composite membrane (membrane 1)

[0016] Weigh 5.0g of polyvinyl alcohol with a degree of polymerization of 1750±50 and 95g of deionized water into a three-necked flask, heat in a constant temperature water bath at 90°C, and dissolve for 1.5h while stirring at 900r / min. After completely dissolving, it is lowered to 25° C. to prepare an aqueous solution of polyvinyl alcohol with a mass concentration of 5%. Add 0.25 g of EDTMPA to the polyvinyl alcohol aqueous solution under the condition of stirring at 900 r / min, stir for 2 hours and mix evenly, filter the membrane-forming liquid through a screen to remove impurities, and then let stand for defoaming. Then the polysulfone (PS) hollow fiber support layer was soaked in the foam-free casting solution for 10 minutes, and dried at 20-25° C. for 12 hours to obtain a PVA-EDTMPA / PS hollow fiber composite membrane (membrane 1).

[0017] The prepared film 1 is subjected t...

Embodiment 2

[0018] The preparation of embodiment 2 PVA-EDTMPA / PS hollow fiber composite membrane (membrane 2)

[0019] Weigh 5.0g of polyvinyl alcohol with a degree of polymerization of 1750±50 and 95g of deionized water into a three-necked flask, heat in a constant temperature water bath at 90°C, and dissolve for 1.5h while stirring at 900r / min. After completely dissolving, it is lowered to 25° C. to prepare an aqueous solution of polyvinyl alcohol with a mass concentration of 5%. Add 0.5 g of EDTMPA to the aqueous solution of polyvinyl alcohol under stirring at 900 r / min, stir for 2 hours and mix evenly, filter the membrane-forming solution through a sieve to remove impurities, and then let stand for defoaming. Then the polysulfone (PS) hollow fiber support layer was soaked in the foam-free casting solution for 10 minutes, and dried at 20-25° C. for 12 hours to obtain a PVA-EDTMPA / PS hollow fiber composite membrane (membrane 2).

[0020] The prepared film 1 is subjected to scanning ele...

Embodiment 3

[0021] The preparation of embodiment 3 PVA-EDTMPA / PS hollow fiber composite membrane (membrane 3)

[0022] Weigh 5.0g of polyvinyl alcohol with a degree of polymerization of 1750±50 and 95g of deionized water into a three-necked flask, heat in a constant temperature water bath at 90°C, and dissolve for 1.5h while stirring at 900r / min. After completely dissolving, it is lowered to 25° C. to prepare an aqueous solution of polyvinyl alcohol with a mass concentration of 5%. Add 1.0 g of EDTMPA to the polyvinyl alcohol aqueous solution under stirring at 900 r / min, stir for 2 hours and mix evenly, filter the membrane-forming solution through a screen to remove impurities, and then let stand for defoaming. Then the polysulfone (PS) hollow fiber support layer was soaked in the foam-free casting solution for 10 minutes, and dried at 20-25° C. for 12 hours to obtain a PVA-EDTMPA / PS hollow fiber composite membrane (membrane 1).

[0023] The prepared film 1 is subjected to scanning elect...

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Abstract

The invention relates to a preparation method and application of a hollow fibre compound membrane; PVA, EDTMPA and PS are taken as raw materials; the mass ratio of the EDTMPA to the PVA is 1 to 50 : 50 to 99; a PS hollow fibre is used as a supporting layer; the preparation method includes that: the PVA is dissolved into water to be prepared into a solution with a mass concentration of 4 to 7 percent; the EDTMPA is added into the PVA water solution, the mixture is subject to stirring and filtering for impurity removal so as to obtain a casting solution which stands for defoaming, then the PS hollow fibre supporting layer is dipped into the foam-free casting solution and is dried. The invention has simple preparation, strong controllability, high separating property, abundant raw materials and low price; when the invention is used for removing the water in propylene, the permeability coefficient can reach 2851GPU and the separation factor is 302000.

Description

technical field [0001] The present invention relates to a hollow fiber composite membrane and its preparation method and application. Specifically, it is a blend material of ethylenediaminetetramethylenephosphonic acid (EDTMPA) and polyvinyl alcohol (PVA) as an active separation layer, polysulfone hollow fiber A preparation method and application of a hollow fiber composite membrane with a porous membrane as a support layer. Background technique [0002] Gas membrane separation is a process of separating components in a dense membrane by utilizing their different dissolution and diffusion properties. Membrane dehumidification is to use the membrane as a mass separation agent to prepare a suitable membrane module and remove trace water in the gas through the gas separation process. Membrane dehumidification technology is currently mainly used in natural gas dehumidification, air dehumidification and other industrial gas dehumidification. Compared with traditional separation...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/08B01D71/68B01D71/38
Inventor 姜忠义潘福生贾会平崔莉
Owner TIANJIN UNIV
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