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Method for preparing xylooligosaccharide through two-step lactic acid catalytic hydrolysis

A technology for xylo-oligosaccharide and catalytic hydrolysis, which is applied in the directions of sugar production, xylose production, and sugar juice production, etc., and can solve the problem that the yield of xylo-oligosaccharide is not ideal, the yield of xylo-oligosaccharide is low, and the process is complicated. and other problems, to achieve significant economic and social benefits, increase yield, and simple operation.

Active Publication Date: 2021-07-09
NANJING FORESTRY UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Alkali extraction-hydrolysis two-step preparation method adopts alkali treatment to extract xylan, which is complex and produces a large amount of waste liquid, with more pollution, and then acid treatment or enzymatic hydrolysis, the yield of xylo-oligosaccharides obtained is low; direct acid treatment Although the yield of xylooligosaccharides prepared by treatment has been improved, it is still necessary to optimize the reaction parameters repeatedly and the yield of xylooligosaccharides is still not ideal

Method used

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  • Method for preparing xylooligosaccharide through two-step lactic acid catalytic hydrolysis

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preparation example Construction

[0022] The preparation method of the invention has high yield of xylooligosaccharide, simple operation, mature and reliable, no pollution, and is suitable for large-scale production.

[0023] Unless otherwise specified, the present invention has no special requirements on the sources of the raw materials involved in the above methods, and those known to those skilled in the art can be used.

[0024] In the invention, the raw materials are mixed with the lactic acid aqueous solution, the solid-liquid separation is carried out after the first catalytic reaction, and the first reaction liquid and filter residue are obtained. In the present invention, the raw material preferably includes one or more of corn cobs, corn stalks, wheat straws and poplar sawdust, more preferably corn cobs. In the present invention, the raw material is waste in the agricultural and forestry processing industry, contains cellulose and lignin, etc., can be hydrolyzed into xylooligosaccharides, and is used...

Embodiment 1

[0034] according to figure 1 Shown flow chart prepares xylo-oligosaccharide, specifically:

[0035] The first catalytic reaction: Weigh corn cobs with a crushed particle size of 0.25 mm and a dry weight of 1 gram, and add the weighed corn cobs and lactic acid with a volume concentration of 1% in the reaction kettle according to the ratio of material to liquid 1:10 solution, at a temperature of 160°C, after catalytic reaction for 40 minutes, the reaction product was cooled to 25°C in ice water, and solid-liquid separation was carried out by vacuum filtration to obtain the first reaction liquid and filter residue containing xylooligosaccharides, and the first The reaction solution.

[0036] The second catalytic reaction: Weigh the corncob filter residue with an absolute dry weight of 1 g, and carry out the catalytic reaction again according to the first catalytic condition to obtain the second reaction liquid.

[0037] The quality of xylooligosaccharides in the first reaction ...

Embodiment 2

[0045] The conditions of the two-step lactic acid catalytic hydrolysis are the same as in Example 1, except that the volume concentration of the lactic acid solution is 2%. The yields of xylobiose, xylotriose, xylotetraose, xylopentaose and xylohexaose in the first reaction solution were 18.5%, 13.5%, 13.4%, 8.5% and 6.0%, respectively, and the measured xylooligosaccharides The yield was 59.9%; the yields of xylobiose, xylotriose, xylotetraose, xylpentaose and xylohexaose in the second reaction solution were 2.8%, 2.3%, 1.4%, 1.2% and 0.7%, respectively, The measured xylo-oligosaccharide yield was 8.4%. Finally, after combining the two catalytic reaction liquids, the final yield of xylooligosaccharides was 68.3%.

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Abstract

The invention relates to a method for preparing xylooligosaccharide through two-step lactic acid catalytic hydrolysis, and belongs to the technical field of biomass conversion. The method comprises the following steps: mixing a raw material with a lactic acid aqueous solution, carrying out first catalytic reaction, and then carrying out solid-liquid separation to obtain a first reaction solution and filter residues; and mixing the filter residues with a lactic acid aqueous solution, and carrying out a second catalytic reaction to obtain a second reaction solution. The first reaction solution and the second reaction solution are solutions containing xylooligosaccharide. The preparation method disclosed by the invention is high in xylooligosaccharide yield, simple to operate, mature, reliable, pollution-free and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of biomass conversion, in particular to a method for preparing xylooligosaccharides by catalytic hydrolysis of lactic acid in two steps. Background technique [0002] my country's annual corn production ranks second in the world, and corncobs are wastes produced during the processing and utilization of corn grains. Corn cob hemicellulose content is as high as about 32%, mainly xylan, which is one of the best raw materials for the preparation of xylooligosaccharides. At present, the preparation process of xylo-oligosaccharides can be roughly divided into two types: "alkaline extraction-hydrolysis two-step preparation method" and "one-step preparation method". The principle of producing oligosaccharides in these two types of processes is the same: first, hemicellulose is separated from lignin and cellulose, and then hemicellulose is hydrolyzed into xylooligosaccharides. The difference is that the two-step pr...

Claims

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Application Information

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IPC IPC(8): C13K13/00C13B10/00
CPCC13B10/003C13K13/002
Inventor 张军华杨倩倩徐勇连之娜文沛瑶应文俊
Owner NANJING FORESTRY UNIV
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