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High-flux hyperbranched polysiloxane pervaporation membrane and preparation method thereof

A technology of pervaporation membrane and polysiloxane, which is applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of lack of high-performance membrane materials and difficulty of permeate flux to meet the requirements of fermentation process, etc. Achieve high permeation flux, stable structure and performance, and good film-forming properties

Active Publication Date: 2012-10-03
WUXI UNMIXED CLEANSE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current problem of pervaporation membranes is the lack of high-performance membrane materials, and the permeation flux of the membrane is often difficult to meet the requirements of the fermentation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of large flux hyperbranched polysiloxane pervaporation membrane comprises the following steps, and the described formula ratio is by weight:

[0022] (1) Synthesis of hyperbranched polysiloxane: Mix 15 parts of vinyltriethoxysilane and 2.5 parts of potassium hydroxide in 78.4 parts of tetrahydrofuran, react at 0°C for 6 hours, and then add 4 parts of acetic acid Filter after neutralization to get AB x type monomer solution. Add 0.1 part of dibutyltin dilaurate to the monomer solution, react at 30°C for 36h, and remove the solvent by rotary evaporation at 35°C to obtain hyperbranched polysiloxane.

[0023] (2) Preparation of pervaporation membrane: Mix 5 parts of terminated hydroxymethyl polydimethylsiloxane, 20 parts of hyperbranched polysiloxane, and 0.1 part of dibutyltin dilaurate in 74.9 parts of tetrahydrofuran, And react at 60°C for 24 hours to form a casting solution. The casting solution is evenly coated on the polyacrylonitrile base fi...

Embodiment 2

[0026] The preparation method of large flux hyperbranched polysiloxane pervaporation membrane comprises the following steps, and the described formula ratio is by weight:

[0027] (1) Synthesis of hyperbranched polysiloxane: Mix 40 parts of tetraethoxysilane and 10 parts of sodium hydroxide in 44.5 parts of toluene, react at 10°C for 2 hours, then add 5 parts of hydrochloric acid to neutralize After filtering, get AB x type monomer. Add 0.5 parts of dibutyltin oxide to the monomer solution, react at 100°C for 12h, and remove the solvent by rotary evaporation at 45°C to obtain hyperbranched polysiloxane.

[0028] (2) Preparation of pervaporation membrane: Mix 30 parts of hydroxyethyl-terminated polydimethylsiloxane, 10 parts of hyperbranched polysiloxane, and 0.5 parts of dibutyltin oxide in 59.5 parts of toluene, and mix them in React at 120°C for 12 hours to form a casting solution. The casting solution is evenly coated on the polyvinylidene fluoride base film with an aver...

Embodiment 3

[0031] The preparation method of large flux hyperbranched polysiloxane pervaporation membrane comprises the following steps, and the described formula ratio is by weight:

[0032] (1) Synthesis of hyperbranched polysiloxane: Mix 34.5 parts of tetramethoxysilane and 10 parts of lithium hydroxide in 40 parts of n-hexane, react at 10°C for 2 hours, and then add 15 parts of phosphoric acid and after filtering, get AB x type monomer. Add 0.5 parts of monobutyltin oxide to the monomer solution, react at 100°C for 12h, and remove the solvent by rotary evaporation at 40°C to obtain hyperbranched polysiloxane.

[0033] (2) Preparation of pervaporation membrane: Mix 30 parts of hydroxymethyl-terminated polydiphenylsiloxane, 29.5 parts of hyperbranched polysiloxane, and 0.5 parts of monobutyltin oxide in 40 parts of n-hexane evenly, and React at 120°C for 12 hours to form a casting solution. The casting solution is evenly coated on the polyethersulfone base film with an average pore s...

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Abstract

The invention relates to a high-flux hyperbranched polysiloxane pervaporation membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The preparation method for the membrane comprises the following process steps: mixing and reacting hyperbranched polysiloxane, hydroxyl terminated polysiloxane, a catalyst and a solvent to obtain a casting solution, coating the casting solution on a polymer porous basement membrane, and drying to obtain the high-flux hyperbranched polysiloxane pervaporation membrane. The hyperbranched polysiloxane pervaporation membrane prepared by the method has the characteristics of high permeation flux and high swelling resistance; and moreover, the preparation method is simple, convenient to operate, high in production repeatability and high in membrane structure controllability, and the high-flux hyperbranched polysiloxane pervaporation membrane is suitable for removing low-concentration alcohols from water, particularly suitable for separating low molecular alcohols from fermentation liquor.

Description

technical field [0001] The invention relates to a large flux hyperbranched polysiloxane pervaporation membrane and a preparation method thereof, which belong to the technical field of high technology and membrane separation. Background technique [0002] With the increasing depletion of petroleum resources worldwide, the importance of developing renewable energy sources such as ethanol and butanol and other low-molecular-weight alcohols is beyond doubt. In the process of bio-fermentation to prepare fuel low-molecular-weight alcohols, timely removal of low-molecular-weight alcohols from the fermentation broth is the key to obtaining low-molecular-weight alcohol products, reducing the inhibitory effect of low-molecular-weight alcohols on the fermentation process, and making the process continue. Membrane process is a new separation technology with high efficiency and energy saving, especially pervaporation membrane process, its energy consumption is only 1 / 2-1 / 3 of traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00
Inventor 白云翔朱元华张春芳顾瑾孙余凭
Owner WUXI UNMIXED CLEANSE EQUIP
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