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A phenyl-modified PDMS separation membrane, preparation method and use thereof in the separation of aromatic compounds

A technology for separating membranes and compounds, applied 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 good separation selection sexual and penetrative effects

Active Publication Date: 2022-06-24
NANJING TECH UNIV
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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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  • A phenyl-modified PDMS separation membrane, preparation method and use thereof in the separation of aromatic compounds
  • A phenyl-modified PDMS separation membrane, preparation method and use thereof in the separation of aromatic compounds
  • A phenyl-modified PDMS separation membrane, preparation method and use thereof in the separation of aromatic compounds

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Embodiment 1

[0047] The mobility consistency between the main chain and the side chain groups results in the stacking of PDMS segments in a highly entangled structure. PDMS membranes for membrane separation typically require curing using tetraethylorthosilicate as a crosslinking agent.

[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 Dissolved in n-heptane to make a 10 wt% polymer solution. The casting solution was crosslinked by using a crosslinking agent, tetraethyl orthosilicate, and a catalyst, dibutyltin dilaurate, wherein polymer:crosslinking agent:catalyst=100:10:1 (mass ratio). When the casting solution reaches a suitable viscosity, a doctor blade is used to draw a film on the porous PVDF support. The prepared composite film was evaporated at room temperature for 24 hours, and then further thermally cross-linked at 70°C for 12 hours to obtain...

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Abstract

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. The technical scheme of the present invention is to construct a high-speed permeation transmission channel for aromatic molecules by introducing a rigid spacer in the polysiloxane chain segment. The hindrance promotes the higher mobility of the remaining methyl groups, and at the same time, the larger phenyl group inhibits the cooperative movement between the polymer main chains, thereby inhibiting the entanglement between the chain segments, increasing freedom and lower transmission. The mass resistance allows the aromatic substances closer to the free volume of the polymer to be rapidly transported in the membrane.

Description

technical field [0001] The invention relates to a phenyl-modified PDMS separation membrane, a preparation method and its use in the separation of aromatic compounds, and belongs to the technical field of separation membrane materials. Background technique [0002] The efficient recovery of volatile organic compounds from aqueous solutions has significant environmental and economic value. Aromatic compounds are typically high-boiling, macromolecular-sized VOCs. The selective recovery of these compounds currently involves processes such as distillation, solvent extraction, and adsorption, which exhibit considerable energy intensity and complex work-up. 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 pervaporation processes relies on the preferential adsorption and diffusion of components in the membrane material. Therefore, compared with distil...

Claims

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Application Information

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Patent Type & Authority Patents(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 TECH UNIV
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