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Method for disposing straws by sulfur trioxide gas

A sulfur trioxide and gas treatment technology, which is applied in fiber raw material treatment, textile and papermaking, fermentation, etc., can solve the problems of high energy consumption of steam blasting, limited processing capacity of ultra-high pressure equipment, large equipment investment, etc., and achieve pollution Small size, high saccharification rate and low energy consumption

Inactive Publication Date: 2009-09-23
安徽安生生物化工科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as, the steam explosion that Rebeller Michelr (French patent FR2580669 date of application 1985.4.18 publication date 1986.10.24) proposes and dilute acid is used to pretreat lignocellulose method, but there is waste acid treatment problem; Application date 1985.5.21 Publication date 1987.2.17) Invented supercritical lignocellulose pretreatment technology combined with liquid ammonia, but the processing capacity of this type of ultra-high pressure equipment is limited and it is difficult to be used in large-scale production processes. Ammonia recovery system; Nanjing University Zhengzheng (Chinese patent CN200710130844.8 application date: 2007.08.20 publication date: 2008.02.06) disclosed the pretreatment technology of ammonia water and vacuum blasting method, which also needs to solve the problem of ammonia recovery; Chinese Academy of Sciences Chen Hongzhang from the Institute of Process Engineering and others (Chinese invention patent CN100999739A, application date 2006.1.13 and publication date 2007.7.18) invented the "Method for Coupling Treatment of Straw with Steam Explosion and Alkaline Hydrogen Peroxide Oxidation". This method has a small amount of wastewater and a simple process, but The steam explosion method consumes a lot of energy and requires a large investment in equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Crush rice straw to 20-80 mesh, take 100 grams, put it into a 500mL flask, and pass a mixed gas of 20%v / v sulfur trioxide and air in a water bath at 70°C until the pressure in the bottle is ≤0.1MPa , Heat preservation for 2 hours; then, treat with dilute lye at 70°C for 3 hours to obtain 53g (dry weight) of lignocellulose; then use cellulase produced by Trichoderma viride ZY-1 solid-state fermentation for saccharification Degradation produces reducing sugars, using 30FPIU / g substrate, solid-liquid ratio of 1:6, saccharification and degradation at 50°C for 36 hours, terminating the reaction, and extracting the saccharification liquid to obtain (equivalent) reducing sugar 49g.

Embodiment 2

[0022] Example 2: Crush the rice straw to 20-80 mesh, take 100 grams, pass in sulfur trioxide gas from 20 ml of fuming sulfuric acid, and keep it in a water bath at 70°C for 2 hours; then, treat it with dilute lye at 70°C In 3 hours, 60g (dry weight) of lignocellulose was obtained; the cellulase produced by Trichoderma viride ZY-1 solid-state fermentation was used for saccharification and degradation to produce reducing sugars. The substrate was selected as 20FPIU / g, and the solid-liquid ratio was 1:6, saccharification and degradation at 50°C for 36 hours, the reaction is terminated, and the saccharification liquid is extracted to obtain 57g (reduced) reducing sugar.

Embodiment 3

[0023] Example 3: Cotton stalks were crushed into 20-80 mesh, 100 grams were taken, 30% v / v sulfur trioxide and air mixed gas were introduced until the pressure in the bottle was ≤0.1MPa, and the water bath was kept at 70°C for 3 hours; Treated with dilute lye at ℃ for 3 hours to obtain 74.3g (dry weight) of lignocellulose; then use the cellulase produced by Trichoderma viride ZY-1 solid-state fermentation for saccharification and degradation to produce reducing sugars, using 50FPIU / g substrate, solid-liquid ratio of 1:7, saccharification and degradation at 50°C for 48 hours, termination of the reaction, and extraction of the saccharification liquid to obtain 33.4 g (equivalent to) reducing sugar.

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Abstract

A method for disposing straws by sulfur trioxide gas is characterized in that the method comprises the following steps of firstly pumping the sulfur trioxide gas in the straws to carry out a reaction; subsequently, soaking the reacted straws in a diluted aqueous alkaline solution or disposing the reacted straws by an ammonia to obtain a lignocellulose; finally putting the lignocellulose into a buffer solution with cellulase to carry out saccharification, thus obtaining saccharification liquid. The method adopts the sulfur trioxide gas to dispose and obtain the plant cellulose easy to be saccharified and fermented by the cooperation function together with the suitable diluted lye, has simple pre-disposal process, low consumption of raw materials and auxiliary materials, hardly produces wastewater and the produced cellulose is easy to be saccharified. The prepared saccharification liquid has no inhibition to the subsequent fermentation and can be used for producing chemical products such as ethanol, butanol, butyric acid, lactic acid, and the like, by fermentation.

Description

Technical field [0001] The invention relates to a new method for synergistically treating lignocellulosic biomass such as straws with sulfur trioxide, mixed gas containing sulfur trioxide and dilute lye, and then obtaining fermentable sugar through cellulase hydrolysis and saccharification. It belongs to lignocellulose pretreatment and saccharification technology. Background technique [0002] Alleviating the shortage of petroleum resources, solving the contradiction of “competing food with people”, and reducing air pollution are of extremely important strategic significance at present. Fuel ethanol, butanol, etc., as renewable energy sources, have excellent environmental benefits and can significantly reduce emissions into the atmosphere. The amount of greenhouse gases, so the demand and supply of biofuels are constantly expanding. The biofuel production process is divided into two steps, the first step is saccharification; the second step is fermentation. Most of them are prepa...

Claims

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Application Information

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IPC IPC(8): C12P19/14D21C5/00
Inventor 姚日生胡华佳邓胜松余三喜崔玉杰杨世明
Owner 安徽安生生物化工科技有限责任公司
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