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Method for co-production of lactic acid and alcohol by lignocellulose

A technology for lignocellulose and ethanol production, which is applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., and can solve the problems of high cost per unit of ethanol production and low utilization value added.

Inactive Publication Date: 2012-02-29
熊鹏
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for the joint production of lactic acid and ethanol by using lignocellulose for the low added value of existing lignocellulose such as straws, especially for the current high cost of lignocellulose per unit production of ethanol. The production method uses different components in lignocellulose to produce fuel ethanol and lactic acid, the production process is simple, and the added value is high

Method used

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  • Method for co-production of lactic acid and alcohol by lignocellulose
  • Method for co-production of lactic acid and alcohol by lignocellulose

Examples

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Effect test

Embodiment 1

[0035] Example 1: 3 kilograms of straw were placed in a 50-liter pretreatment reactor, 3 kilograms of water were added, 1.6Mpa saturated steam was introduced for 10 minutes, and 6.5 liters of pretreated liquid obtained after the straw was squeezed, in the liquid Add 13 milliliters of 98% concentrated sulfuric acid, transfer the liquid into another reaction kettle and heat it to 160 degrees Celsius with steam for 30 minutes; use lime to neutralize to pH 5.0, leave standstill for 3 hours, and filter out the crystalline sulfuric acid by centrifugal filtration. Calcium; the neutralized xylose-containing liquid obtained from pretreatment is concentrated 10 times under reduced pressure at 80 degrees Celsius; at this time, the concentration of xylose is about 450 g / l, and the mass of the pretreated straw after pressing is 5.5 kg , the water content accounts for 60% (mass percentage); add 5.5 kg of pretreated straw into a 20-liter fermenter, add culture medium for disinfection, add...

Embodiment 2

[0036] Embodiment 2: place 3 kilograms of straws in the pretreatment reactor of 50 liters, add 20 kilograms of water and 300 grams of calcium hydroxide, directly feed 200 degrees Celsius of saturated steam to make the temperature of reaction reach 150 degrees Celsius, and keep for 1 hour; After passing through plate-and-frame pressure filtration, the liquid part was neutralized to pH 6 by adding sulfuric acid, left standing for 3 hours, and the crystallized calcium sulfate was filtered off by centrifugation. A unit of xylanase was reacted for 2 hours, and the final xylose concentration was 85 g / l. After fermentation by Rhizopus oryzae as in Example 1, the final lactic acid concentration was 50.5 g / l, and the lactic acid liquid was obtained by separation and purification. 99% lactic acid solution; after the solid part is added to the 20-liter fermentor, the medium is added for disinfection, the volume is 15 liters, and hydrolysis and fermentation are carried out as in Example 1,...

Embodiment 3

[0037] Embodiment 3: place 3 kilograms of straws in 50 liters of pretreatment reactors, start to feed the steam of 1.2Mpa for 5 minutes, reduce the temperature to 50-60 degrees Celsius, and use a plate and frame filter press to filter and wash to obtain liquid 8 liter, the remaining grass is still placed in the pretreatment reactor of 50 liters, and the steam of 2.0Mpa is passed into for 5 minutes, and the temperature is reduced to 50-60 degrees Celsius, and the plate and frame filter press is used to filter and wash to obtain 9 liters of liquid; The two liquids were mixed, transferred to another reactor and heated to 160 degrees Celsius with steam, and kept for 60 minutes; the treated liquid was concentrated to 2 liters, and the obtained xylose concentration was 150 g / l, as shown in Example 1. After the fermentation of Rhizopus oryzae, the final concentration of lactic acid was 90 g / l, and the lactic acid liquid was separated and purified to obtain a 99% lactic acid solution; ...

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Abstract

The invention discloses a method for co-production of lactic acid and alcohol by lignocellulose. The co-production method comprises the following steps of: (A) preprocessing the lignocellulose, converting the hemicellulose in the lignocellulose into soluble xylose, and getting the xylose liquid and the solid; (B) concentrating the xylose liquid obtained in the step (A), fermenting the microbe, which can produce the lactic acid by taking the xylose as the carbon source, to get the lactic acid fermentation coarse liquid, and purifying the fermentation coarse liquid to get the high-purity lactic acid; (C) hydrolyzing the solid obtained in the step (A) into glucose with cellulose, fermenting the microbe, which can produce the alcohol with the glucose, to produce the alcohol-containing fermentation broth, and distilling and dehydrating the alcohol-containing fermentation broth to get the high-concentration alcohol. In the method provided by the invention, different components in the lignocellulose are used for producing energy and bulk chemical products including the fuel alcohol and the lactic acid, production technology is simple, products have high additional value, and waste materials are turned into valuable things, so that the method has strong economic and social meaning.

Description

technical field [0001] The invention belongs to the field of high value-added utilization of lignocellulose such as straw, and particularly relates to fully utilizing lignocellulose components to synthesize fuel and chemical products. Background technique [0002] my country has a large number of renewable straw resources, and the annual output can reach more than 600 million tons. At present, with the development of my country's agriculture and the improvement of farmers' living standards, the use of straw in rural areas is becoming less and less, and most of them are still treated by burning them back to the fields. Pollution also has adverse effects on some roads and air traffic. Efficient utilization of cellulosic wastes such as straw and turning waste into treasure has also become a good thing for the country and the people. [0003] At present, there are mainly the following ways to utilize waste lignocellulose in agriculture and forestry such as straw: 1. The lignoce...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12P7/56C12R1/245C12R1/07C12R1/225C12R1/845C12R1/865C12R1/84C12R1/645
CPCY02E50/10
Inventor 熊鹏周玉珍熊涛程益红
Owner 熊鹏
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