Preparation method of hollow fiber dispersion and dialysis alkali recycling membrane

A diffusion dialysis and hollow technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of small membrane area and small processing capacity, and achieve large processing capacity, small footprint and economic benefits significant effect

Active Publication Date: 2013-02-06
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the disadvantages of flat membrane diffusion dialysis is that the membrane a

Method used

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  • Preparation method of hollow fiber dispersion and dialysis alkali recycling membrane
  • Preparation method of hollow fiber dispersion and dialysis alkali recycling membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The polypropylene hollow fiber ultrafiltration commercial membrane is selected as the hollow fiber base membrane. The inner diameter of the hollow fiber base membrane is 0.45mm, the wall thickness is 0.2mm, and the membrane pore size is 0.1 micron. The hollow fiber base membrane is placed in a plasma chamber for plasma activation, the vibration frequency is 40MC, the purity of oxygen used is 99.5%, and the activation time is 30 minutes. The activated hollow fiber base membrane was immersed in a mixed solution of 85% styrene, 14.5% divinylbenzene and 0.5% benzoyl peroxide to carry out functional group grafting.

[0028] The grafted base membrane is sulfonated with silver sulfate as a catalyst and concentrated sulfuric acid as a sulfonating agent at 45°C for 8 hours. After cooling, separating and taking out, a hollow fiber diffusion dialysis alkali recovery membrane can be obtained. The ion exchange capacity is 0.7 meq / g film.

[0029] In this embodiment, the schematic d...

Embodiment 2

[0031] The polyacrylonitrile hollow fiber ultrafiltration commercial membrane is selected as the hollow fiber base membrane. The inner diameter of the hollow fiber base membrane is 0.6 mm, the wall thickness is 0.3 mm, and the membrane pore size is 0.15 microns. The hollow fiber base membrane is placed in a plasma chamber for plasma activation, the vibration frequency is 50MC, the purity of oxygen used is 99.8%, and the activation time is 40 minutes. The activated hollow fiber base membrane was soaked in a mixed solution of 75% styrene, 24% divinylbenzene and 1% benzoyl peroxide to carry out functional group grafting.

[0032] The grafted base membrane is sulfonated with silver sulfate as a catalyst and concentrated sulfuric acid as a sulfonating agent at 50°C for 6 hours. After cooling, separating and taking out, a hollow fiber diffusion dialysis alkali recovery membrane can be obtained. The ion exchange capacity is 0.6 meq / g film.

Embodiment 3

[0034] The nylon hollow fiber ultrafiltration commercial membrane is selected as the hollow fiber base membrane. The inner diameter of the hollow fiber base membrane is 0.7mm, the wall thickness is 0.4mm, and the membrane pore size is 0.1 micron. The hollow fiber base membrane is placed in a plasma chamber for plasma activation, the vibration frequency is 45MC, the purity of oxygen used is 99.5%, and the activation time is 50 minutes. The activated hollow fiber base membrane was immersed in a mixed solution of 80% styrene, 20% divinylbenzene and 1% benzoyl peroxide to carry out functional group grafting.

[0035] The grafted base membrane is sulfonated with silver sulfate as a catalyst and concentrated sulfuric acid as a sulfonating agent at 50°C for 7 hours. After cooling, separation and removal, a hollow fiber diffusion dialysis alkali recovery membrane can be obtained. The ion exchange capacity is 0.7 meq / g film.

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Abstract

The invention discloses a preparation method of a polymeric membrane and particularly relates to a preparation method of a hollow fiber dispersion and dialysis alkali recycling membrane. The preparation method comprises the steps of selecting a hollow fiber ultra-filtration membrane of polypropylene, polyacrylonitrile or nylon as a hollow fiber base membrane; putting the base membrane into a plasma chamber to carry out plasma activation; immersing the activated hollow fiber base membrane into a solution of styrene, divinylbenzene and benzoyl peroxide to carry out functional group grafting; and sulfonating the hollow fiber base membrane with the grafted functional group by taking silver sulfate as a catalyst and taking concentrated sulfuric acid as a sulfonating agent. The preparation method has the advantages that a membrane material in unit area has the characteristics of large processing amount, small occupied area of an assembly made of the membrane and the like. The preparation method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a preparation method of a hollow fiber diffusion dialysis alkali recovery membrane. Background technique [0002] A large amount of spent caustic soda is produced in papermaking, aluminum casting, chemical fiber, ion exchange resin regeneration and other processes. If it is allowed to be discharged directly, it will cause serious environmental pollution. If neutralization is used to treat waste alkali, a large amount of acid will be consumed, and a large amount of inorganic salt will be formed in the wastewater, so alkali recovery must be carried out. At present, the alkali recovery technology is mainly based on cooking and incineration, and a few fields use nanofiltration membrane recovery. These methods have the disadvantage of high recovery and operation costs. The recovery of alkali by diffusion dialysis is a new and economical method for alkali reco...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/08B01D67/00
Inventor 金可勇金水玉高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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