Phenyl-modified PDMS separation membrane, preparation method and application of phenyl-modified PDMS separation membrane in aromatic compound separation

A technology for separating membranes and compounds, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low permeation flux, low selective separation, etc., to avoid entanglement, improve spacing, and improve separation selection. Effects of sex and permeability

Active Publication Date: 2022-03-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: traditional PDMS membranes have low permeation flux and low selectivity for separation of aromatic compounds.

Method used

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  • Phenyl-modified PDMS separation membrane, preparation method and application of phenyl-modified PDMS separation membrane in aromatic compound separation
  • Phenyl-modified PDMS separation membrane, preparation method and application of phenyl-modified PDMS separation membrane in aromatic compound separation
  • Phenyl-modified PDMS separation membrane, preparation method and application of phenyl-modified PDMS separation membrane in aromatic compound separation

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Embodiment 1

[0047] The consistent mobility between the main chain and the side chain groups leads to the stacking of PDMS segments in a highly entangled structure. PDMS membranes used for membrane separation usually require tetraethylorthosilicate as a cross-linking agent for curing.

[0048] The synthetic route of the present embodiment is as follows:

[0049]

[0050] The preparation method is:

[0051] A certain amount of hydroxyl-terminated PDMS-(C 6 h 5 ) 2 Dissolve in n-heptane to make a 10 wt% polymer solution. The casting liquid is crosslinked by using the crosslinking agent tetraethyl orthosilicate and the catalyst dibutyltin dilaurate, wherein the polymer: crosslinking agent: catalyst = 100:10:1 (mass ratio). When the casting solution reaches a suitable viscosity, use a scraper to scrape and coat the porous PVDF support to form a film. The prepared composite film was evaporated at room temperature for 24 hours, and then thermally cross-linked at 70° C. for 12 hours to o...

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Abstract

The invention relates to a phenyl-modified PDMS separation membrane, a preparation method and application of the phenyl-modified PDMS separation membrane in aromatic compound separation, and belongs to the technical field of separation membrane materials. According to the technical scheme, a rigid spacer is introduced into a polysiloxane chain segment to construct a high-speed permeation transmission channel of aromatic molecules, and under the action of phenyl, the chain spacing of the polymer is increased, so that the lower steric hindrance promotes the residual methyl to have higher motility, and meanwhile, the high-speed permeation transmission of aromatic molecules is realized. The larger phenyl group inhibits the synergistic movement between main chains of the polymer so as to inhibit the winding between chain segments, and the increased freedom and lower mass transfer resistance enable aromatic substances closer to the free volume of the polymer to be quickly transferred in the membrane.

Description

technical field [0001] The invention relates to a phenyl-modified PDMS separation membrane, a preparation method and its application in the separation of aromatic compounds, belonging to the technical field of separation membrane materials. Background technique [0002] Efficient recovery of VOCs from aqueous solutions has important environmental and economic value. Aromatic compounds are a typical VOCs with high boiling point and large molecular size. Selective recovery of these compounds currently involves processes such as distillation, solvent extraction, and adsorption, which exhibit considerable energy intensity and complex workup. As an energy-saving process, pervaporation membrane technology is widely used in the separation process of organic-water or organic-organic mixtures. The separation performance of the pervaporation process relies on the preferential adsorption and diffusion of components in the membrane material. Therefore, compared with distillation sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/70B01D69/02B01D67/00B01D61/36
CPCB01D71/82B01D71/70B01D69/02B01D67/0006B01D67/0011B01D67/0013B01D61/362B01D69/107B01D71/701C02F1/448B01D2323/30B01D69/12C02F2101/322C02F2101/345B01D2323/08B01D2323/081C02F2101/32C02F2101/34
Inventor 刘公平潘阳金万勤朱海鹏
Owner NANJING UNIV OF TECH
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