Preparation method of modified organosilicone dephenolized membrane

A silicon dephenolization membrane, organic technology, applied in the field of preparation of modified organosilicon membranes, can solve the problems of affecting the toughness of PDMS membranes, degraded separation performance, large amount of zeolite added, etc., achieves strong innovation and application prospects, and inhibits swelling. , to ensure the effect of operating stability

Inactive Publication Date: 2015-01-07
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation process of all-silica zeolite is relatively complicated and requires hydrothermal synthesis. In addition, zeolite can only promote separation within a certain content range. If the content exceeds a critical content, the separation performance will be significantly reduced due to particle agglomeration and interface defects. , and generally the addition of zeolite is relatively large, which affects the toughness of PDMS membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Preparation of 1% oleyl alcohol modified silicone pervaporation membrane

[0015] First, the hydroxyl-terminated polydimethylsiloxane and n-octane were mechanically stirred until dissolved to form a transparent solution; then, ethyl orthosilicate and the catalyst dibutyltin dilaurate were added and mechanically stirred for 20 minutes, and the mass ratio of the four was terminal Hydroxypolydimethylsiloxane: n-octane: tetraethyl orthosilicate: catalyst=33:60:5:2; Next, add oleyl alcohol, and the quality of oleyl alcohol is that of hydroxyl-terminated polydimethylsiloxane 1%, and mechanically stirred for 10 minutes to mix evenly. Finally, cast the obtained solution on the bottom membrane of ultrafiltration to form a film. After standing at room temperature for 4 hours, put the film into a vacuum drying oven at 60 degrees to dry for 8 hours.

[0016] 2) The 1% oleyl alcohol modified organosilicon pervaporation membrane prepared by the above method was used to test its ph...

Embodiment 2

[0020] 1) Preparation of 5% oleyl alcohol modified silicone pervaporation membrane

[0021] First, mechanically stir the hydroxyl-terminated polydimethylsiloxane and n-heptane until it dissolves to form a transparent solution; then, add orthosilicate and the catalyst dibutyltin dilaurate and mechanically stir for 5 minutes, and the mass ratio of the four is terminal Hydroxypolydimethylsiloxane: n-heptane: ethyl orthosilicate: catalyst=33:60:5:2; Next, add oleyl alcohol, the quality of oleyl alcohol is the quality of hydroxyl-terminated polydimethylsiloxane 5%, mechanically stirred for 2 minutes to mix evenly, and finally, cast the obtained solution on the nanofiltration bottom membrane to form a film, and after standing at room temperature for 5 hours, put the film in a vacuum drying oven at 80 degrees to dry for 12 hours.

[0022] 2) The 5% oleyl alcohol modified organosilicon pervaporation membrane prepared by the above method was used to test its phenol / water pervaporation ...

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Abstract

The invention belongs to the technical field of pervaporation membrane separation and in particular relates to a preparation method of a modified organosilicone dephenolized membrane. The preparation method of the modified organosilicone dephenolized membrane comprises the following steps: firstly, mechanically stirring room temperature vulcanization liquid silicone rubber with a solvent until the room temperature vulcanization liquid silicone rubber is dissolved and a transparent solution is formed; then, adding a crosslinking agent and a catalyst, and mechanically stirring for 5-20 minutes, wherein the mass ratio of the room temperature vulcanization liquid silicone rubber to the solvent to the crosslinking agent to the catalyst is 33:60:5:2; then adding oleic alcohol the mass of which is 1%-5% of that of the room temperature vulcanization liquid silicone rubber, mechanically stirring for 2-10 minutes, and uniformly mixing; and finally, casting the obtained solution on a supporting basement membrane to form a membrane, standing at room temperature for 4-5 hours, and then drying the membrane in a vacuum drying oven at the temperature of 60-80 DEG C for 8-12 hours. A preparation process of the modified membrane is simple and easy, and the obtained membrane has good comprehensive performance of separating phenol from water when being used for separating a phenol/water mixture; permeation flux of the membrane can be 526g.m<-2>.h<-1>, and a separation factor of the membrane can be 8.63; great potential in industrialized application is shown.

Description

Technical field: [0001] The invention relates to a preparation method of a modified organic silicon membrane that can be used for separating phenol in water by a pervaporation method, and belongs to the technical field of pervaporation membrane separation Background technique: [0002] Pervaporation (PV) is a process in which components are separated by using the difference in dissolution and diffusion rates of components through the membrane under the impetus of the vapor pressure difference of the components of the liquid mixture. Pervaporation membrane separation technology has significant advantages such as low investment, low operating cost, high separation efficiency, easy scale, good scalability, easy control, and easy replacement. It is considered to be able to replace traditional separation methods such as distillation and liquid-liquid extraction. The main applications of pervaporation include solvent dehydration, removal of organic substances (such as alcohols and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/10B01D67/00B01D61/36
Inventor 叶宏廖怡平王玉
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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