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Industry glycerol normal pressure pretreatment method of eco-efficient conversion of agricultural straw cellosugar

A technology of straw cellulose and industrial glycerin, which is applied in the direction of fermentation, etc., can solve the problems of lignocellulosic biomass that have not yet been developed, and achieve the effect of achieving high-efficiency conversion and improving enzymatic crackability

Inactive Publication Date: 2008-12-17
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

At present, there is no research on glycerol pretreatment of lignocellulosic biomass in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The corn stalks with a length of 10-20 mm and a weight of 10 g are fully soaked with tap water to moisten and swell, and then excess water is removed to a water content of 40-60 ml per gram of dry stalk. Then put the wet straw into a digester, add 100g of glycerin and stir evenly, then heat up in a cooker with a power of 800-1200w, and the heating time is 30-60min. Boiling temperature is raised to 200°C, after heat preservation and boiling for 2 hours, cooking basically completes the replacement process of water in the straw and external glycerin, which also causes a large amount of hemicellulose-lignin complexes to peel off from the cellulose and dissolve in the boiling glycerin . When cooling down to 120-160°C, add 100-200ml of boiling 30-40% glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so as to fully dissolve the hemicellulose and lignin peeled off from the cellulose .

[0017] After cooling, carry out solid-liquid separat...

Embodiment 2

[0020] Fully soak rice stalks with a length of 10-20mm and a weight of 10g with tap water to moisten and swell, and then remove excess water until the water content per gram of dry straw is 40-60ml. Then put the wet straw into a digester, add 200g of glycerin and stir evenly, then heat up in a cooker with a power of 800-1200w, and the heating time is 30-60min. After boiling and heating to 250°C for 6 hours, the cooking basically completed the replacement process of moisture in the straw and external glycerin, which also caused a large amount of hemicellulose-lignin complexes to peel off from the cellulose and dissolve in the boiling glycerol . When cooling down to 120-160°C, add 100-200ml of boiling 30-40% glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so as to fully dissolve the hemicellulose and lignin peeled off from the cellulose .

[0021] After cooling, carry out solid-liquid separation: use a G3 sand core funnel for vacuum filt...

Embodiment 3

[0024] Straws such as wheat with a length of 10-20 mm and a weight of 10 g are fully soaked with tap water to moisten and swell, and then excess water is removed until the water content per gram of dry straw is 40-60 ml. Then put the wet straw into a digester, add 150g of glycerin and stir evenly, then heat up in a cooker with a power of 800-1200w, and the heating time is 30-60min. After boiling the temperature to 240°C and holding it for 4 hours, the cooking basically completed the replacement process of moisture in the straw and external glycerin, which also caused a large amount of hemicellulose-lignin complexes to peel off from the cellulose and dissolve in the boiling glycerol . When cooling down to 120-160°C, add 100-200ml of boiling 30-40% glycerin aqueous solution, fully dissolve and stir to continue cooling down to 60-80°C, so as to fully dissolve the hemicellulose and lignin peeled off from the cellulose .

[0025] After cooling, carry out solid-liquid separation: ...

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Abstract

The invention relates to an economical preprocessing method for efficiently transforming crop straw cellulose sugar, with technical glycerin under normal temperature. Straw which is sufficiently soaked in water can be rapidly heated up under normal pressure after the addition of the technical glycerin so as to realize pre-treatment to straws by high temperature steaming. Water insoluble fiber section obtained by the pre-treatment can be transformed efficiently into glucose by direct enzymolysis without airing or baking. By the pre-treatment method, under the condition that the temperature is between 180 DEG C and 250 DEG C, and the dosage of the technical glycerin is equal to 10 times to 25 times of the weight of the straw, the pre-treatment is carried out for 1hour to 6 hours to obtain the crop straw fiber section, the weight of which accounts for 48 percent to 78 percent of the net weight of the straw; after the pre-treatment for 24 hours, the transformation rate of the cellulose sugar of the straw fiber section is 62 percent to 95 percent, and after the pre-treatment for 48 hours, the transformation rate of the cellulose sugar reaches 71 percent to 98 percent. The method is economical, high efficient, safe to be operated, easy and convenient, environment friendly and convenient to popularization and application.

Description

technical field [0001] The invention belongs to the field of crop straw biomass biochemical engineering. Due to the inhomogeneity and complex structure of the natural straw, the enzymatic hydrolysis and fermentability of the natural straw are poor, and it is difficult to make high-value utilization of the natural straw. Therefore, finding an economically feasible, simple, efficient and environmentally friendly pretreatment method to release the binding of hemicellulose-lignin to cellulose and increase the conversion rate and amount of cellulose-sugar is the key to high-value utilization of cellulosic biomass. the bottleneck. This patent uses industrial glycerin, a by-product of the oil industry, as an atmospheric cooking solvent to pretreat crop straw, which greatly improves the enzymatic attack of straw, realizes the efficient conversion of straw cellulose sugar, and is conducive to further high-value utilization of straw. Background technique [0002] The water-insoluble ...

Claims

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Application Information

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IPC IPC(8): C12P19/04
Inventor 陈洪章孙付保
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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