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Process for preparing organic and inorganic composite film by autoassembling tech

An inorganic composite membrane and self-assembly technology, which is applied in the field of organic-inorganic composite membranes prepared by self-assembly technology, can solve the problems of unsatisfactory membrane permeability and high cost, and achieve excellent pervaporation separation performance, high controllability, and repeatability Good results

Active Publication Date: 2007-03-21
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, methods such as grafting organic matter on ceramic membranes, interfacial polymerization, and partial pyrolysis of organic matter are generally used to prepare organic-inorganic composite membranes, but most of them are in the experimental stage, or the permeability of the membrane is not ideal, or the cost is too high

Method used

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  • Process for preparing organic and inorganic composite film by autoassembling tech
  • Process for preparing organic and inorganic composite film by autoassembling tech
  • Process for preparing organic and inorganic composite film by autoassembling tech

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of organic-inorganic composite membrane

[0024] A mixture of 50ml of tetraethyl orthosilicate, 50ml of absolute ethanol, 30ml of deionized water, and 5ml of nitric acid was placed in a water bath at 60°C and refluxed for 2 hours to obtain a silica sol, which was sealed and aged in an oven at 25°C.

[0025] The prepared silica sol was coated on Al 2 o 3 The inner side of the porous ceramic membrane tube is dried in an oven at 25°C for 3 days, and then fired at 500°C for 4 hours, then the inner side of the ceramic membrane tube is coated with SiO 2 The membrane layer was washed alternately with acetone, ethanol, and deionized water, and repeated washing 5 times, and then in pure N 2 Blow dry in air.

[0026] Add hydrochloric acid to polyallyl ammonium chloride to prepare a cationic solution, wherein the concentration of polyallyl ammonium chloride is 0.01mol / L, and the concentration of hydrochloric acid is 0.01mol / L. Add hydrochloric acid to sodium polyst...

Embodiment 2

[0029] Pervaporation performance test of composite membrane in the above example

[0030] On the self-made pervaporation experimental device, the separation research of the ethanol / water mixture of the composite membrane is carried out. The weight concentration of raw material ethanol is 95% (that is, the water content is 5%), and the osmotic pressure is 500Pa. The experimental results are shown in Figure 2 and Figure 3 .

[0031] It can be seen from Fig. 3 that the water content of the raw material solution increases from 5% to 16% on the permeate side, and the composite membrane preferentially permeates water, thereby further concentrating the ethanol in the raw material solution.

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Abstract

A process for preparing the composite organic-inorganic membrane by self-assembling technique includes such steps as mixing ethyl silicate, de-ionized water, absolute alcohol and acid catalyst, heating to obtain SiO2 sol, ageing, coating it on the one surface of Al2O3 ceramic substrate, drying, calcining, washing to obtain SiO2-Al2O3 substrate, preparing poly-cationic electrolyte solution and poly-anionic electrolyte solution by use of hydrochloric acid, immersing the SiO2 side of said substrate in the poly-cationic solution and washing with clean water, immersing in polyanionic solution and washing with clean water, and repeating said alternative immersing and washing steps to form nano-class compact membrane layer.

Description

technical field [0001] The invention relates to a method for preparing a membrane for separation, in particular to a method for preparing an organic-inorganic composite membrane by self-assembly technology. Background technique [0002] As a separation method, membrane separation has the advantages of high selectivity, simple operation, low energy consumption, less land occupation, and no pollution. In recent years, it has gradually become a unit operation in the field of separation, and has formed a considerable industrial scale. From the perspective of the development process of membrane separation technology, the research on organic separation membranes started early, developed rapidly, and was widely used. The organic membrane has good flexibility, high selectivity, simple preparation process, relatively mature process, and cheap price, but its thermal stability is poor, it is not resistant to acids, alkalis and organic solvents, and its service life is short in harsh en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12
Inventor 徐南平金万勤陈祎玮相里粉娟
Owner NANJING TECH UNIV