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Cellulose ethanol concentration by employing modified dimethyl polysiloxane polymer membrane

A technology of dimethylsiloxane and polymer membranes, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of complex concentration process, low product concentration, high energy consumption, etc., and achieve separation performance Good, improved fermentation yield, high film-forming effect

Inactive Publication Date: 2008-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low product concentration, high cost, complicated follow-up concentration process and high energy consumption in the existing process of producing ethanol from cellulose, and provide a method of using membrane pervaporation to concentrate corn stalk raw materials after pre-processing The process of low concentration ethanol produced by treatment, cellulose enzymatic hydrolysis and pentose hexose fermentation

Method used

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  • Cellulose ethanol concentration by employing modified dimethyl polysiloxane polymer membrane
  • Cellulose ethanol concentration by employing modified dimethyl polysiloxane polymer membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of Film 1

[0042] Film-making material preparation: the mass percentage of each component is: polydimethylsiloxane 1 (molecular weight 3500), 5%, polydimethylsiloxane 2 (molecular weight 4500), 15%; inorganic additive ZSM -5, 1%; initiator azobisisovaleronitrile, 0.1%; solvent n-hexane 79%. Add catalyst at 25°C, 0.1%; stir for 10-20h, then cross-link at 60°C for 2-6h. Pour the reacted casting solution on a polytetrafluoroethylene plate, scrape the film with a scraper, and dry it in the air for 24 hours. The film thickness of the finally obtained interpenetrating network water deethanol pervaporation film is about 100 μm.

Embodiment 2

[0043] Example 2 Preparation of Membrane 2

[0044] Film-making material preparation: the mass percentage of each component is: polydimethylsiloxane 1 (molecular weight 3000), 10%, polydimethylsiloxane 2 (molecular weight 5000), 10%; inorganic additive ZSM -5, 2%; initiator azobisisoheptanonitrile, 0.2%; solvent n-hexane 78%. Add catalyst at 25°C, 0.2%; stir for 10-20h, then cross-link at 60°C for 2-6h. Pour the reacted casting solution on a polytetrafluoroethylene plate, scrape the film with a scraper, and dry it in the air for 24 hours. The film thickness of the finally obtained interpenetrating network water deethanol pervaporation film is about 100 μm.

Embodiment 3

[0045] Example 3 Preparation of Membrane 3

[0046] Film-making material preparation: the mass percentage of each component is: polydimethylsiloxane 1 (molecular weight 3500), 15%, polydimethylsiloxane 2 (molecular weight 5000), 15%; inorganic additive HZSM -5, 1%; initiator dimethyl azobisisobutyrate, 0.1%; solvent n-hexane 69%. Add catalyst at 25°C, 0.5%; stir for 10-20h, then cross-link at 60°C for 2-6h. Pour the reacted casting solution on a polytetrafluoroethylene plate, scrape the film with a scraper, and dry it in the air for 24 hours. The film thickness of the finally obtained interpenetrating network water deethanol pervaporation film is about 100 μm.

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Abstract

The invention discloses a cellulose ethanol technology which can use modified Polydimethylsiloxane polymer film to concentrate. Firstly, the raw material of wood cellulose can be smashed; and then hemicellulose can be eluted and hydrolyzed by diluted acid in a circulatory way. The obtained hydrolyzing sugar solution which mainly contains pentose can be fermented to produce ethanol. Solid residue left after the hydrolysis of the diluted acid can be mashed by a ball grinder to remove lignin, and then can be broken down by the cellulose. The obtained hydrolyzing sugar solution which mainly contains hexose can be fermented to produce ethanol. The ethanol fermentation liquid produced by fermenting pentose and hexose can be infiltrated and vaporized to concentrate ethanol after being filtered by an inorganic microfiltration membrane. The technology of the invention is simple and has low energy- consumption, low cost, but high yield; in addition, the invention has high selectivity to ethanol, and the operational conditions can be controlled easily. The after processing is easy without pollution.

Description

technical field [0001] The invention belongs to the field of new energy, and specifically relates to a process for preparing fuel ethanol by using cellulose material as a raw material through pretreatment, enzymatic hydrolysis, fermentation, and inorganic hybrid modified polymer membrane pervaporation. Background technique [0002] Compared with the production of ethanol by fermentation of starch and sugar, the concentration of cellulosic ethanol in the fermentation broth is usually 5-7%, and the energy cost of the subsequent concentration process is too high, which has become one of the bottlenecks restricting the large-scale industrialization of cellulosic ethanol. one. Moreover, the accumulation of ethanol will produce product inhibition and reduce the fermentation rate, so it is very necessary to separate ethanol in time during fermentation. [0003] Traditional methods for separating and extracting ethanol from fermentation broth include solvent extraction, adsorption,...

Claims

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Application Information

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IPC IPC(8): C12P7/06C08L83/04C08K7/24C08K7/26C12R1/865
CPCY02E50/17Y02E50/10
Inventor 张红漫陈敬文黄和张林陈欢林贾红华严立石金强
Owner CHINA PETROLEUM & CHEM CORP
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