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Method for disposing straws by sulfur trioxide gas

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

Inactive Publication Date: 2011-06-08
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 application date 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) discloses 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". 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 feed 20% v / v sulfur trioxide and air mixture gas into the bottle at 70°C until the pressure inside the bottle is ≤0.1MPa , keep warm for 2 hours; then, treat with dilute alkaline solution at 70°C for 3 hours to obtain 53g (dry weight) of lignocellulose; then use the cellulase produced by solid-state fermentation of Trichoderma viride (Trichoderma viride) ZY-1 to carry out saccharification Degradate to produce reducing sugar, choose 30FPIU / g substrate, solid-liquid ratio is 1:6, saccharification and degradation at 50 ℃ for 36 hours, stop the reaction, extract the saccharification liquid, get (equivalent) 49g of reducing sugar.

Embodiment 2

[0022] Example 2: crush rice straw to 20-80 mesh, take 100 grams, pass through sulfur trioxide gas from 20 milliliters of oleum, keep it in a water bath at 70°C for 2 hours; then, treat it with dilute lye at 70°C 3 hours, get lignocellulose 60g (dry weight); Utilize again the cellulase produced by Trichoderma viride (Trichoderma viride) ZY-1 solid-state fermentation to carry out saccharification and degradation to produce reducing sugar, select 20FPIU / g substrate for use, solid-liquid ratio is 1:6, saccharification and degradation at 50°C for 36 hours, the reaction was terminated, and the saccharification solution was extracted to obtain (reduced) 57g of reducing sugar.

Embodiment 3

[0023] Example 3: Cotton stalks are crushed to 20-80 mesh, 100 grams are taken, and 30% v / v sulfur trioxide and air mixed gas are introduced to the bottle pressure ≤ 0.1MPa, and the water bath is kept at 70° C. for 3 hours; then, at 70 Treat with dilute alkali solution at ℃ for 3 hours to obtain 74.3g (dry weight) of lignocellulose; then use cellulase produced by solid-state fermentation of Trichoderma viride (Trichoderma viride) ZY-1 to carry out saccharification and degradation to produce reducing sugar, select 50FPIU / g of substrate, the solid-to-liquid ratio was 1:7, saccharified and degraded at 50° C. for 48 hours, the reaction was terminated, and the saccharified solution was extracted to obtain (converted) 33.4 g of 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 novel method for synergistically treating lignocellulosic biomass such as straw and other lignocellulosic biomass with sulfur trioxide, sulfur trioxide-containing mixed gas 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 oil resources, solving the contradiction of "competing with people for food" and reducing air pollution are all extremely important strategic significance at present. Fuel ethanol and butanol, as renewable energy sources, have excellent environmental benefits and can significantly reduce emissions into the atmosphere The amount of greenhouse gases, so the supply of biofuel demand is expanding. The biofuel production process is divided into two steps, the first step is saccharification; the second step is fermentation. Mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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