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Method for preparing fuel ethanol from bamboo fibers

A technology of fuel ethanol and bamboo, which is applied in the field of preparing fuel ethanol from bamboo fiber, and can solve the problems of high cost of cellulase, long hydrolysis time, high operating cost, etc.

Inactive Publication Date: 2009-08-26
RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of cellulase production, long hydrolysis time, and the yield largely depends on the effect of pretreatment, pretreatment requires large equipment and high operating costs

Method used

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  • Method for preparing fuel ethanol from bamboo fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The moso bamboo leftovers are cut off, dried and crushed. Pass 80 mesh sieves, those that pass through the 80 mesh sieves are bamboo fine powders, those that fail to pass are bamboo coarse powders. Take by weighing 400 grams of bamboo meal and add in the cooking reactor, add the mixed solution of formic acid / acetic acid / water (10 / 70 / 20) with liquid-solid ratio 10:1, cook at 105 DEG C for 2h, filter to get 50.2% filter residue (main component cellulose); the filtrate was diluted with water and precipitated out, and 16% lignin was obtained by filtration; the filtrate was concentrated and tested to contain 20% pentosan.

Embodiment 2

[0026] Add the cellulose obtained in Example 1 into a hydrolysis reactor, add 85% formic acid and 4% hydrochloric acid at a liquid-solid ratio of 25:1, and hydrolyze it at 60° C. for 6 hours. After the formic acid is recovered by distillation under reduced pressure, 55% reducing sugar can be obtained.

Embodiment 3

[0028] Take by weighing 400 grams of bamboo fine powder prepared in Example 1 and add it to a hydrolysis reactor, add 85% formic acid and 4% hydrochloric acid with a liquid-solid ratio of 25:1 and hydrolyze it for 6 hours at 60° C., after formic acid and hydrochloric acid are recovered by distillation under reduced pressure , to obtain 72.7% reducing sugars.

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Abstract

The invention discloses a method for preparing fuel ethanol from bamboo fibers. The method comprises the following steps that: waste from bamboo (or other non-wood biomass) processing is used as a raw material, the raw material is cut, dried, crushed and passed through a 80-mesh sieve, the powder passing through the 80-mesh sieve is fine bamboo powder and the powder failing to pass through the 80-mesh sieve is coarse bamboo powder; the coarse bamboo powder is cooked in a mixed liquid of formic acid, acetic acid and water for hydrolyzing hemicellulose and delignification, and fibers are obtained and subjected to hydrolysis by an organic acid to form a reducing monosaccharide; the fine bamboo powder is hydrolyzed directly by the organic acid to form the reducing monosaccharide; the reducing monosaccharide obtained from the hydrolysis of the hemicelluloses, the fibers and the fine bamboo powder are detoxicated by an excess amount of Ca(OH)2, the pH of the mixture is reduced, and the fuel ethanol is obtained after fermentation and rectification. The method for producing the fuel ethanol ensures the yield of the fuel ethanol, reduces the energy consumption for hydrolysis, and allows the organic acid used for hydrolysis to be recycled. In addition, the process of the fuel ethanol preparation using the method requires less water, and reduces environmental pollution and cost.

Description

technical field [0001] The invention relates to a method for preparing fuel ethanol from bamboo fiber, that is, taking bamboo as raw material, hydrolyzing the bamboo fiber with an organic acid to obtain reducing sugar, and then fermenting the obtained reducing sugar to obtain fuel ethanol. Among them, the used organic acid can be recycled. technical background [0002] With the increase of the world's population and the improvement of the industrialization of various countries, energy and environmental issues have become the focus of global attention. Fossil energy materials such as petroleum, coal and natural gas are gradually depleted. In order to protect the environment and achieve the goal of sustainable human development, the production of high value-added chemical products from renewable resources, especially woody biomass, has become an important development strategy and scientific research in many countries. hotspot areas. Biomass energy is a renewable and clean en...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12P19/00C12P19/02C12R1/865C12R1/72
CPCY02E50/16Y02E50/10
Inventor 张金萍周本智王敬文杜孟浩
Owner RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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