Method for performing lignocelluloses raw material high-temperature diluted acid pretreatment by using extremely small amount of water

A lignocellulose and pretreatment technology, applied in biofuel, fermentation and other directions, can solve the problems of large water consumption, high energy consumption, high pressure of wastewater treatment, etc., and achieve the effect of improving utilization efficiency, simplifying process and saving costs.

Inactive Publication Date: 2011-04-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this pretreatment process consumes a lot of water, usually requiring 6 to 10 tons of water / ton of dry straw, and consumes a lot of energy. Only after separation can the subsequent enzymatic hydrolysis and fermentation sections be carried out, and the pressure of wastewater treatment is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 800g of crushed and dried corn stalks, measure 400mL or 400g of prepared 5% (w / w) dilute sulfuric acid, then slowly pour the dilute acid into the straw in the plastic box, and stir repeatedly until Mix the solid and liquid evenly (the bulk density of the mixed corn stalk is about 150g / L), then put it into a plastic bag, seal it and place it at room temperature for pre-soaking for 15 hours. Then add the pre-soaked stalks into the pretreatment reactor (10L), open the inlet valve and feed high-temperature steam with a pressure of about 3.0MPa, keep the temperature in the reactor at 190°C and 1.2MPa for 3min, and then open the The exhaust valve releases the pressure to normal pressure, takes out the pretreated material in the reactor and cools it rapidly to normal temperature, and then the treated material can be obtained. The solid content of the obtained treated material was 48.8% (w / w), the total amount of water used in the whole pretreatment process was 782.4 g, a...

Embodiment 2

[0029] Weigh 800g of crushed and dried corn stalks, weigh 800mL or 800g of prepared 5% (w / w) dilute sulfuric acid, then slowly pour the dilute acid into the straw in the plastic box, and stir repeatedly until Mix the solid and liquid evenly (the bulk density of the mixed corn stalk is about 150g / L), then put it into a plastic bag, seal it and place it at room temperature for pre-soaking for 15 hours. Then add the pre-soaked stalks into the pretreatment reactor (10L), open the inlet valve and feed high-temperature steam with a pressure of about 3.0MPa, keep the temperature in the reactor at 190°C and 1.2MPa for 3min, and then open the The exhaust valve releases the pressure to normal pressure, takes out the pretreated material in the reactor and cools it rapidly to normal temperature, and then the treated material can be obtained. The solid content of the obtained treated material was 37.2% (w / w), the total water used in the whole pretreatment process was 1300.0 g, and the stea...

Embodiment 3

[0031]Weigh 800g of crushed and dried corn stalks, weigh 400mL or 400g of prepared 2% (w / w) dilute sulfuric acid, then slowly pour the dilute acid into the straw in the plastic box, and stir repeatedly until Mix the solid and liquid evenly (the bulk density of the mixed straw is about 150g / L), then put it into a plastic bag, seal it and place it at room temperature for pre-soaking for 15 hours. Then add the pre-soaked stalks into the pretreatment reactor (10L), open the inlet valve to feed high-temperature steam with a pressure of about 3.0MPa, keep the temperature in the reactor at 200°C and 1.4MPa for 3min, and then open the The exhaust valve releases the pressure to normal pressure, takes out the pretreated material in the reactor and cools it rapidly to normal temperature, and then the treated material can be obtained. The solid content of the obtained treated material was 47.9% (w / w), the total amount of water used in the whole pretreatment process was 812.0 g, and the am...

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Abstract

The invention provides a method for performing lignocelluloses raw material high-temperature diluted acid pretreatment by using extremely small amount of water, which comprises the following steps: (1) pre-treating a lignocelluloses raw material to remove impurities; (2) mixing the raw material with 0.2 to 10 weight percent acidic solution in an extremely high solid to liquid ratio, uniformly stirring, and standing at normal temperature to infiltrate the acidic solution into the lignocelluloses raw material completely, wherein the extremely high solid to liquid ratio is 1:2-3:1; and (3) filling the obtained raw material into a pretreatment reactor at a 100 percent material filling rate, heating the raw material to a required temperature and pressure directly by high-temperature steam, keeping the temperature and pressure for a certain period of time, relieving pressure, taking the material out and cooling. When the method is used, water consumption and energy consumption are reduced greatly on the premise of ensuring the pretreatment effect, zero discharge of sewage is realized, a pretreated lignocelluloses raw material with high solid content is obtained, and the perfect connection with a subsequent high-solid-content biological processing process is realized.

Description

【Technical field】 [0001] The invention relates to the fields of chemical industry and bio-energy, more specifically, to a high-temperature dilute acid pretreatment method for lignocellulosic raw materials in the production process of cellulosic ethanol. 【Background technique】 [0002] Extensive exploitation and use of fossil fuels have made human beings face the crisis of exhaustion of traditional energy sources, and have also triggered increasingly serious environmental crises, such as air pollution and the greenhouse effect. Countries all over the world have to accelerate the research and development of alternative energy sources. Among them, bio-liquid fuels, especially bio-ethanol, have become the focus of research and development of alternative energy sources due to their advantages of environmental protection, practicality, renewability, and ease of transportation. [0003] Cellulosic ethanol is the second generation of bio-ethanol, which mainly uses the most abundant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/06
CPCY02E50/17Y02E50/10
Inventor 鲍杰张建王修胜楚德强张怀庆
Owner EAST CHINA UNIV OF SCI & TECH
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