Method for preparing hollow fiber type forward osmotic membrane

A forward osmosis membrane, hollow technology, applied in the field of preparation of hollow fiber forward osmosis membrane, can solve the problems of unsatisfactory application, difficult membrane cleaning, small specific surface area, etc., and achieve anti-pollution cleaning, easy cleaning, and large filtration area Effect

Active Publication Date: 2014-12-10
SUZHOU FAITH HOPE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The configuration of the membrane module is mainly flat-plate membrane module, the filling rate is low, the specific surface area is small, the membrane cleaning is difficult, etc., which cannot meet its application in large-scale separation occasions

Method used

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  • Method for preparing hollow fiber type forward osmotic membrane
  • Method for preparing hollow fiber type forward osmotic membrane
  • Method for preparing hollow fiber type forward osmotic membrane

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] A preparation method of hollow fiber type composite forward osmosis membrane specifically includes the following steps:

[0029] 1. Take a certain amount of PEI hollow fiber porous base membrane into a membrane module, and place the membrane module in the membrane filtration device;

[0030] 2. Wash the residual glycerin on the surface of the membrane module with distilled water, remove the residual moisture from the membrane module with an air compressor, and dry the hollow fiber base membrane in the shade;

[0031] 3. Prepare a polyamine aqueous solution, make the polyamine aqueous solution pass through the inner surface of the membrane module, and then use an air compressor to remove excess water on the membrane module surface. The polyamine is m-phenylenediamine with a concentration of 2.0% by weight, and the passage time of the polyamine aqueous solution is 120 seconds.

[0032] 4. Prepare an organic solution containing polybasic acid chloride, make the organic solution pa...

example 2- Embodiment 10

[0036] The hollow fiber type composite forward osmosis membrane was prepared using the same process as in Example 1, and tested. The difference lies in the use of different hollow fiber porous base membranes listed in Table 1, polyamines and their concentrations, additives and their concentrations, polyacid chloride organic solutions and polyacid chloride concentrations, alcohol aqueous solutions, passage time, treatment time. The test results of the prepared film are also shown in Table 1.

[0037] Table 1

[0038]

[0039]

[0040]

[0041] It can be seen from Table 1 that the hollow fiber composite forward osmosis membrane prepared by the method of the present invention has high pure water permeation flux and low salt permeation flux, combining the definition and formula of pure water permeation flux and salt permeation flux ( 1) (2) It can be inferred, the effective filtration area of ​​the same size components is large, which is suitable for the forward osmosis separation pr...

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Abstract

The invention discloses a method for preparing a hollow fiber type forward osmotic membrane, which specifically comprises the following steps that: 1, a hollow fiber substrate membrane is made into a membrane component, and the membrane component is put in a membrane filtration device; 2, the residual glycerol on the surface of the membrane component is washed with water, the residual water of the membrane component is removed, and the hollow fiber substrate membrane is dried; 3, a polyamine aqueous solution is prepared and is enabled to pass through the internal surface of the membrane component, and then, the residual water on the surface of the membrane component is removed; 4, an organic solution which contains multi-acyl chloride is prepared, and is enabled to pass through the internal surface of the membrane component to react for a certain while; and 5, after the reaction is completed, the aqueous solution which contains alcohol is used to treat the membrane which is obtained from the reaction, so the hollow fiber type forward osmotic membrane is obtained. The hollow fiber composite forward osmotic membrane which is prepared by the method for preparing the hollow fiber type forward osmotic membrane has high filling rate and pollution resistance, is easy to clean, has a large effective filter area compared with components of the same size, and is suitable for a forward osmotic separation process.

Description

Technical field [0001] The invention relates to a method for preparing a membrane, in particular to a method for preparing a hollow fiber type forward osmosis membrane. Background technique [0002] Forward osmosis technology is a membrane separation technology developed in recent years. It is a technology that relies on solution osmotic pressure as a driving force to achieve target solution separation. Its characteristics are that the separation of the target system can be achieved without external pressure, and it has strong anti-pollution ability and can be operated under normal temperature and pressure. It is an energy-saving, environmentally-friendly and sustainable separation method. The forward osmosis membrane separation technology is therefore suitable for many fields such as seawater desalination, hard water softening, wastewater treatment, salt water concentration, food concentration, slow drug release, and field survival. [0003] As a selective permeation membrane, fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08
Inventor 王开宇程喜全杨乾李屹肖有昌邵路
Owner SUZHOU FAITH HOPE MEMBRANE TECH
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