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Methods for producing fuel ethanol by using cellulosic waste plants

A technology of waste plants and fuel ethanol, applied in the direction of microorganism-based methods, biofuels, liquid carbon-containing fuels, etc., can solve the problems of impregnation with concentrated sulfuric acid, large consumption of sulfuric acid, and large volume of raw materials, so as to reduce production costs, The effect of reducing pollution and simplifying the production process

Inactive Publication Date: 2009-12-30
张羡信
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under current normal conditions, enzymatic hydrolysis of cellulose requires very harsh conditions and high costs.
The article "Research and Development Trend of Cellulose Ethanol" published on June 15, 2008 introduced that the current production of one ton of cellulosic ethanol requires an enzyme preparation cost of 2000-2600 yuan, which is very expensive
But there are three difficulties: one is that the volume of raw materials is large, and more concentrated sulfuric acid is required for impregnation. Generally, the heap specific gravity of sawdust is 6, and the heap specific gravity of wheat straw reaches 12. The volume of sulfuric acid to impregnate these raw materials is quite large; The molecular weight is similar, so it cannot be recovered by the ion exchange membrane of reclaiming sulfuric acid; the third is that the lignin in the material absorbs a large amount of hydrolyzate and sulfuric acid, causing a lot of waste. Therefore, the method for hydrolyzing cellulose with concentrated sulfuric acid requires a large amount of sulfuric acid. and unable to produce

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: the method for producing ethanol from sawdust

[0060] 1. 100g of sawdust (heap specific gravity is 6) that is ground to be less than 1mm is carried out pre-hydrolysis with 600ml of sulfuric acid with a concentration of 3% by weight, and filtered after heating at 100°C for 1 hour. The monosaccharide in the filtrate detected by Peilin method is about 21g, the residue was rinsed with water, and the rinse solution was also incorporated into the above-mentioned filtrate.

[0061] 2. Lime is added to the above-mentioned filtrate to form calcium sulfate precipitate, and then filtered to remove the precipitate. The amount of lime added is about 10.5g, so that the pH value of the solution is equal to 7.

[0062] 3. Remove lignin: get 2.4g of sodium hydroxide accounting for 3% of residue weight, 0.6g of 0.8% biocatalyst, 0.2g of 0.2% lignin, mix with 79ml of water, and add the The remaining residue was heated at 80° C. for 2 hours, kept warm for 8 hours, washed wi...

Embodiment 2

[0074] Embodiment 2: the method for producing fuel ethanol with rice straw and waste sulfuric acid

[0075] 1. Waste sulfuric acid is filtered and purified with activated carbon to remove organic impurities. The sulfuric acid with a concentration of about 3% and 75% by weight is obtained by adding water and blending.

[0076] 2, 100g is ground to the rice straw (heap specific gravity is 6) that is finer than 1mm, is that 3% sulfuric acid 600ml carries out pre-hydrolysis with weight percentage concentration, 100 ℃ of heating 1 hour, and the xylose in the Perrin's method detection filtrate is about 17g. The residue is rinsed with water, and the rinse solution is also incorporated into the above-mentioned filtrate.

[0077] 3. Add lime to the above filtrate to form calcium sulfate precipitate, then filter to remove the precipitate, so that the pH value of the solution is equal to 7.

[0078] 4. Add 165 g of concentrated sulfuric acid with a weight percentage concentration of 75...

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Abstract

The invention provides methods for producing fuel ethanol by using cellulosic waste plants. One method comprises the following steps of: cleaning and grinding the waste plants, adding dilute sulfuric acid to lead hemicellulose to be hydrolyzed, filtering, adding lime in filtrate, and removing precipitation; and carrying out delignification treatment on residue, adding sulfuric acid, heating to lead cellulose to be hydrolyzed, diluting till the weight percentage concentration of the sulfuric acid is 30-40%, recycling the sulfuric acid, heating acidiferous sugar liquor again, hydrolyzing, adding calcium oxide for neutralization, and removing calcium sulfate. The other method comprises the following steps of: cleaning and grinding the waste plants, adding waste dilute sulfuric acid to lead hemicellulose to be hydrolyzed, filtering, then adding lime in filtrate, and removing precipitation; adding waste concentrated sulfuric acid in residue, heating, cooling, diluting, heating again, hydrolyzing, adding calcium oxide for neutralization, and removing calcium sulfate; and adding yeast in the product obtained by the method for fermentation, distilling, and dehydrating to obtain the finished product of the fuel ethanol. The methods greatly reduce the cost, have simple process, and are convenient for wide range of generalization and application.

Description

【Technical field】 [0001] The invention relates to the field of reutilization of renewable resources, in particular to a method for producing fuel ethanol by using various cellulose-containing waste plants. 【Background technique】 [0002] Due to the high price of gasoline, it is urgent to find fuel ethanol (alcohol) which can produce cheap fuel to gradually replace gasoline. At present, the main raw materials for the production of fuel ethanol in my country are corn and cassava, and the technology is quite mature, but it is not allowed to compete with the people for food and affect people's livelihood, and the production cost is also high, so the best way to develop fuel ethanol is to use waste wood , rice straw, wheat straw, corn straw and other waste and renewable resources containing cellulose as raw materials. On the one hand, the cost of raw materials is greatly reduced, on the other hand, resources will not be exhausted like oil. [0003] The chemical composition and c...

Claims

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Application Information

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IPC IPC(8): C12P7/10C10L1/02C12R1/645
CPCY02E50/16Y02E50/10
Inventor 张羡信
Owner 张羡信
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