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Method for preparing xylooligosaccharide, lignin and microcrystalline cellulose by completely utilizing straws

A technology of microcrystalline cellulose and xylo-oligosaccharide, applied in the fields of chemical industry and food, can solve the problems of insufficient utilization, uneven physical and chemical properties, environmental pollution, etc., and achieve the effect of mild conditions and complete utilization.

Active Publication Date: 2014-08-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of lignin on the earth is second only to cellulose, and it is the second most natural polymer material. Due to the complex structure of lignin, the heterogeneity of physical and chemical properties, and the difficulty of separation and extraction, lignin is generally discarded as xylooligosaccharides. are not fully utilized and become environmental pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 takes rice stalks as raw material

[0026] (1) Crush the rice straw to 10 mesh, soak it for 6 hours at a material-to-water ratio of 1:3, and perform flash explosion treatment on the obtained straw. Glycan enzymatic hydrolysis treatment, the dosage of xylan is 100U / mL, the temperature is 40°C, and the enzymatic hydrolysis time is 2 hours;

[0027] (2) Filtration after enzymolysis, filtrate microfiltration membrane removal of impurities, decolorization, ultrafiltration membrane separation and nanofiltration membrane desalination, to obtain a xylooligosaccharide product with a purity of 80% (calculated as total sugar), and a yield of 90% ;

[0028] (3) The enzymatic filter residue of step (2) is subjected to flash explosion treatment again. The flash explosion pressure is 3.0MPa, and the pressure holding time is 3 minutes. The hydrolysis time was 6 hours, 500U / mL laccase was added, the enzymolysis temperature was 40°C, the enzymolysis time was 2 hours and fi...

Embodiment 2

[0030] Embodiment 2 takes wheat straw as raw material

[0031] (1) Crush the wheat straw to 50 mesh, soak it for 1 hour at a material-to-water ratio of 1:2, and perform flash explosion treatment on the obtained straw. Glycan enzymatic hydrolysis treatment, the dosage of xylan is 1000U / mL, the temperature is 50°C, and the enzymatic hydrolysis time is 1 hour;

[0032] (2) Filtration after enzymolysis, filtrate microfiltration membrane removal of impurities, decolorization, ultrafiltration membrane separation and nanofiltration membrane desalination, to obtain a xylooligosaccharide product with a purity of 85% (calculated as total sugar), and a yield of 80% ;

[0033](3) The enzymolysis filter residue of step (2) is subjected to flash explosion treatment again. The flash explosion pressure is 1.8MPa, and the pressure holding time is 20 minutes. The hydrolysis time is 2 hours, 3000U / mL laccase is added, the enzymolysis temperature is 50°C, the enzymolysis time is 1 hour, and the...

Embodiment 3

[0035] Embodiment 3 takes corn stalks as raw material

[0036] (1) Crush corn stalks to 80 mesh, soak for 3 hours at a material-to-water ratio of 1:5, and perform flash explosion treatment on the obtained straw. The flash explosion pressure is 0.8MPa, and the holding time is 5 minutes. Glycan enzymatic hydrolysis treatment, the dosage of xylan is 2000U / mL, the temperature is 40°C, and the enzymatic hydrolysis time is 6 hours;

[0037] (2) Filtration after enzymolysis, filtrate microfiltration membrane removal of impurities, decolorization, ultrafiltration membrane separation and nanofiltration membrane desalination, to obtain a xylooligosaccharide product with a purity of 90% (calculated as total sugar), with a yield of 70% ;

[0038] (3) The enzymatic filter residue of step (2) is subjected to flash explosion treatment again, the flash explosion pressure is 4.0MPa, and the pressure holding time is 5 seconds. The hydrolysis time was 1 hour, 100U / mL laccase was added, the enz...

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PUM

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Abstract

The invention discloses a method for preparing xylooligosaccharide, lignin and microcrystalline cellulose by completely utilizing straws, belonging to the technical fields of food and chemical engineering. The method comprises the following steps: by using straws of wheat, rice, corn and other agricultural crops as raw materials, pulverizing, soaking in water, carrying out certain-intensity steam explosion depolymerization treatment, adding xylanase for enzymolysis, filtering, and carrying out membrane separation on the filtrate to obtain the xylooligosaccharide; carrying out certain-intensity steam explosion treatment on the filtration residue, adding cellulase and laccase for enzymolysis, filtering, carrying out high-pressure value equalizing on the filtrate, decolorizing, concentrating and drying to obtain the microcrystalline cellulose; and immersing the filtration residue in a solution with a certain pH value, reacting at specific temperature, carrying out vacuum filtration under reduced pressure, carrying out solid-liquid separation, and drying to obtain the refined lignin. By adopting the steam explosion and composite enzymolysis, the method has the advantage of mild conditions, avoids using toxic reagents, and implements complete utilization of the hemicellulose, cellulose and lignin components in the straws.

Description

technical field [0001] The invention relates to a method for preparing xylooligosaccharides, lignin and microcrystalline cellulose by fully utilizing straws, belonging to the technical fields of food and chemical industry. Background technique [0002] At present, the comprehensive utilization of straw is mainly used for energy utilization such as straw fertilizer utilization, power generation, biogas, gasification and carbonization, as well as for papermaking, plate processing, weaving, handicraft production and feed utilization. However, some existing key technologies have not been broken through or are immature, such as boiler corrosion, coking and low unit efficiency in straw power generation; straw gasification has problems such as tar removal in the gas supply network and low system load rate; Straw solidification and carbonization have problems such as poor reliability of production equipment, high energy consumption, poor coordination of equipment systems, and unstab...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P19/04C08H7/00
Inventor 赵伟杨瑞金胡建雪
Owner JIANGNAN UNIV
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