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Method for preparing organic pervaporation membrane

A pervaporation membrane, organic technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problem that pervaporation membrane cannot realize the microscopic chemical structure and microstructure structure of separation layer and support layer interface. , to achieve the effect of improving permeation flux and separation factor, simplifying preparation steps and reducing preparation cost

Active Publication Date: 2013-07-17
JIANGSU JIUMO HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current pervaporation membrane cannot realize the microchemical structure and microstructure and the interface between the separation layer and the support layer can be regulated at the same time, and proposes a method for preparing an organic pervaporation membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Using (v / v) 7:3 concentrated sulfuric acid and hydrogen peroxide solution to soak the mullite support overnight for hydroxylation pretreatment, and then wash it with deionized water. Get 4 grams of polydimethylsiloxane (PDMS) and 72g of n-hexane, stir and mix at 800rpm for 1h, then add 0.75g of vinyltrimethoxysilane as a crosslinking agent, 0.6g of n-octyltrichlorosilane and 0.1g of anilinomethyltriethoxysilane was used as a dual-functional modifier, stirred at 800rpm for 2h, then added 0.08g of dibutyltin dilaurate catalyst, stirred at 400rpm for 8h to obtain a uniform PDMS membrane coating solution, Finally, the impregnation-pulling method is used to coat the tubular mullite support to obtain a PDMS composite pervaporation membrane with improved permeability and selectivity.

Embodiment 2

[0029] Example 2: The polyethersulfone support was soaked in deionized water for 12 hours to carry out hydroxylation pretreatment. Take 5 g of polyoctylmethylsiloxane (POMS) and 55 g of toluene, stir at 650 rpm for 2 h, then add 0.05 g of vinyltriethoxysilane as a crosslinking agent, 0.03 g of γ-aminopropyltriethoxy Base silane and 0.12g hexadecyltriethoxysilane are used as dual-functional regulators, stir at 650rpm for 2h, add 0.1g of oxalic acid catalyst, stir at 450rpm for 4h to get a uniform PDMS membrane coating solution, and finally use A PDMS composite pervaporation membrane with improved permeability and selectivity can be obtained by coating the polyethersulfone support with a casting method.

Embodiment 3

[0032] Example 3: Soak the cellulose acetate support in 5 wt% dilute sulfuric acid solution overnight for hydroxylation pretreatment. Take 5 grams of polyvinyl alcohol (PVA) and 75g of xylene and mix them, stir at 300rpm for 10h, then add 0.04g of ethyl silicate as a crosslinking agent, 0.03g of hexadecyltrichlorosilane and 0.05g of N-β (Aminoethyl)-γ-aminopropyltriethoxysilane was used as a dual-functional modifier, after stirring at 300rpm for 8h, 0.04g of platinum catalyst was added, and stirring at 700rpm for 10h to obtain uniformly dispersed and stable PDMS composites Finally, the scrap coating method is used to coat the cellulose acetate support to obtain a PDMS composite membrane with microphase separation and equilibrium.

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PUM

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Abstract

The invention relates to a method for preparing a composite pervaporation membrane. The method comprises the following steps of: dissolving an organic matter in a solvent to prepare a homogeneous phase membrane forming solution; adding a crosslinking agent and a difunctional conditioning agent into the membrane forming solution, uniformly mixing and adding a catalyst; coating the prepared membrane forming solution containing the difunctional conditioning agent on a supporting body; and finally performing aftertreatment on the composite membrane to prepare the composite pervaporation membrane.By the method, the permeability and selectivity of the pervaporation membrane can be improved simultaneously, and the stability of the composite membrane is also improved.

Description

technical field [0001] The invention relates to a technology for preparing and regulating organic pervaporation membranes, specifically refers to regulating the microchemical structure and microstructure of organic pervaporation membranes as well as the organic separation layer and support by utilizing the synergistic effect of "reaction inhibition and interface wetting" Interfacial bond strength between layers. Background technique [0002] The pervaporation process is a good method for separating liquid mixtures, including dehydration of aqueous solutions of organic matter, separation of organic matter in water, separation of binary organic mixtures, etc. Organic membrane materials are widely used in pervaporation processes. Organic pervaporation membranes have become the preferred materials for the preparation of pervaporation membranes because of their low price and good film-forming properties. However, there is still a lack of effective means to achieve the controlla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D67/00B01D61/36
Inventor 金万勤卫旺赵旭红徐南平
Owner JIANGSU JIUMO HIGH TECH CO LTD
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