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Method for separating straw components by carrying steam explosion-microwave coupling treatment to plant straw

A technology for plant straw and steam explosion, which is applied in the straw field, can solve the problems of environmental pollution, explosive danger, and high equipment cost, and achieves the effects of easy popularization and application, low equipment requirements, and environmental friendliness.

Inactive Publication Date: 2008-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a method aimed at the low utilization rate of straw renewable resources, serious environmental pollution and low economic efficiency of pretreatment, and the technical concepts of full ecological utilization and high-value graded utilization of straw biomass A new method for component separation of straw pretreated with steam explosion-microwave coupled with glycerin
That is, after fully infiltrating and washing the hemicellulose polysaccharide of the steamed straw with water, add glycerin and stir well and then carry out microwave treatment; after the treatment is completed and slightly cooled, add hot water to stir and keep warm to dissolve lignin; then wash and filter with warm water, and the straw is finished. The pretreatment of three components and the fractional separation of three components; the present invention solves the industrialization problems such as high equipment cost and explosive danger caused by the pretreatment of low-boiling organic solvents such as ethanol, and avoids the problems that occur during traditional acid-base pretreatment. environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: After 100g of dry rice straw was treated under 1.0MPa water vapor for 2 minutes, together with water vapor, it was released rapidly from the steam explosion tank and a sharp explosion occurred; the steam explosion steam explosion straw material was obtained; the steam explosion rice straw Add 40°C water to the material to fully moisten and expand for 4 hours; after fully moistening and expand, wash 3 times, adjust the pH of the washing liquid to 5.5-6.0, and let it stand for 12 hours to obtain hemicellulose with a content of 67% in rice straw, which is air-dried and stored; after washing The water content of the steam-exploded rice straw is 300ml. After adding 500ml glycerin and stirring evenly, microwave treatment for 4 minutes at an output power of 400W, then microwave for 2 minutes when the temperature is naturally cooled to 140°C, and then microwave for 2 minutes when the temperature is naturally cooled to 120°C. After repeated treatment for 10 minutes, st...

Embodiment 2

[0025] Example 2: 100 g of dry wheat straw was treated under 1.3 MPa water vapor for 10 minutes, and the steam was released rapidly from the steam explosion tank together with rapid explosion to obtain steam-exploded wheat straw. Add the steam-exploded wheat straw material to 60°C water to fully moisten it for 6 hours; after fully moistening it, wash it 5 times, adjust the pH of the washing liquid to 5.5-6.0, let it stand for 20 hours, and obtain 80 % hemicellulose, air-dried and stored; the water content of the steam-exploded wheat straw stalk after washing is 500ml, after adding 700ml glycerin and stirring evenly, microwave treatment for 3min at an output power of 800W, and then microwave for 1min when the temperature is naturally cooled to 140°C (the temperature can reach 220 or above), then add 1.5L of hot water at about 100°C to 120°C after natural cooling, stir and heat-preserve to dissolve for 90 minutes;

[0026] Wash and filter with tap water at 60°C for 5 times to ob...

Embodiment 3

[0028] Example 3: Explode 100g of dry corn stalks under 1.5MPa water vapor for 5 minutes to obtain steam-exploded corn stalk material; add 50°C water to the steam-exploded corn stalk material and fully moisten it for 6 hours; fully moisten and expand After washing for 5 times, adjust the pH of the washing solution to 5.5-6.0, let it stand for 20 hours, and obtain hemicellulose accounting for 74% of the original content of corn stalks, and store it in air-dry; the water content of steam-exploded corn stalks after washing is 420ml, add 600ml of glycerin After stirring evenly, microwave at an output power of 800W for 3 minutes, then naturally cool down to 140°C, then microwave for 1min (the temperature can reach 220-260°C), then naturally cool down to 120°C, microwave for 1min, and then cool. So repeated microwave treatment for 6min. After the microwave has finished cooling down, add 1L of hot water at about 100°C and stir to keep warm and dissolve for 60 minutes;

[0029] Wash ...

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Abstract

The steam blasting and microwave treating process for separating plant stalk components includes the following steps: steam blasting plant stalk, expanding and washing in hot water at 40-60 deg.c and letting stand to deposit semi-cellulose; dewatering semi-cellulose, mixing with glycerin and microwave treating intermittently; dissolving in hot water for 30-90 min; washing with 40-60 deg.c water and filtering for 3-5 times to obtain filter cake as the coarse fiber; and depositing the filtrate to obtain lignin. The process has coarse cellulose yield of 52-70 %, semi-cellulose yield and lignin yield in 67-80 % and 70-85 % of content in the stalk separately; and glycerin recovered and reused. The process has high efficiency, environment friendship and other advantages.

Description

technical field [0001] The invention belongs to the field of straw biochemical industry, and particularly relates to a method for separating straw components through steam explosion-microwave coupling treatment on plant straws. The method performs steam explosion coupling microwave pretreatment on plant straws, which can effectively fractionate and separate plant straws The hemicellulose, lignin and cellulose in the straw can greatly improve the enzymatic attackability of the straw fiber, which is conducive to realizing the high value of straw and the full utilization of biomass. Background technique [0002] The water-insoluble lignocellulose present in straw is difficult to be hydrolyzed by microorganisms or enzymes, mainly because of the crystallinity, polymerization degree of cellulose and the lignin sheath surrounding the association of cellulose and hemicellulose. Lignin Combined with hemicellulose in the form of covalent bonds, embed cellulose molecules in it, forming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/30D21B1/36
Inventor 陈洪章孙付保
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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