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Method for converting rice straw into xylitol at high efficiency

A technology of rice straw and xylitol, which is applied in the biological field to achieve the effects of optimizing the purification process, increasing the yield and reducing the loss rate

Inactive Publication Date: 2018-11-16
YIELEAD RICE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But utilize the xylan in the hemicellulose to convert xylitol and still have many problems, such as: 1, how to improve the productive rate of hemicellulose hydrolysis conversion xylose as far as possible; 2, hydrolyzate purification process optimization, improve purification efficiency , reduce the loss rate of xylose; 3, how to improve the conversion rate of xylose into xylitol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Follow the steps below to prepare xylitol:

[0031] (1) Raw material preparation: 10kg of rice straw was killed at 105°C for 20 minutes, dried at 100°C for 1 hour, cut into small pieces of 7cm, put the cut rice straw into the steam explosion machine, and put it under the pressure of 1.8MPa , hold the pressure for 12 minutes and then pop open to get the required raw material steamed and popped rice straw;

[0032] (2) Separation of hemicellulose: Boil the steamed rice straw in a boiling water bath, the mass ratio of the steamed rice straw to water is 1:23, boil for 1h, then centrifuge at 5000rpm for 15min for solid-liquid separation, the same conditions, then boiled for 1 hour, and centrifuged at 5000rpm for 15 minutes for solid-liquid separation, and mixed the two centrifuged liquids to obtain a boiled liquid enriched in hemicellulose;

[0033] (3) Collect the remaining solids in step (2), add 5 mL of sulfuric acid to each gram of solids, the concentration of sulfuric ...

Embodiment 2

[0044] Follow the steps below to prepare xylitol:

[0045] (1) Raw material preparation: 10kg of rice straw was killed at 105°C for 20 minutes, dried at 100°C for 1 hour, cut into small pieces of 10cm, put the cut rice straw into the steam explosion machine, and put it under the pressure of 1.8MPa , hold the pressure for 15 minutes and then pop open to get the required raw material steamed and popped rice straw;

[0046] (2) Separation of hemicellulose: Boil the steamed rice straw in a boiling water bath, the mass ratio of the steamed rice straw to water is 1:30, boil for 1.5h, then centrifuge at 5000rpm for 15min for solid-liquid separation. conditions, then boiled for 1.5h, and centrifuged at 5000rpm for 15min for solid-liquid separation, and mixed the two centrifugal liquids to obtain a boiled liquid enriched in hemicellulose;

[0047] (3) Collect the remaining solids in step (2), add 8 mL of sulfuric acid to each gram of solids, the concentration of sulfuric acid is 0.8M,...

Embodiment 3

[0058] Prepare xylose as follows:

[0059] (1) Raw material preparation: 10kg of rice straw was killed at 105°C for 20 minutes, dried at 100°C for 1 hour, cut into small pieces of 4cm, put the cut rice straw into the steam explosion machine, and put it under the pressure of 1.8MPa , hold the pressure for 10 minutes and then pop open to get the required raw material steamed and popped rice straw;

[0060] (2) Separation of hemicellulose: Boil the steamed rice straw in a boiling water bath, the mass ratio of the steamed rice straw to water is 1:15, boil for 0.6h, and then centrifuge at 5000rpm for 15min for solid-liquid separation. conditions, then boiled for 0.6h, and centrifuged at 5000rpm for 15min for solid-liquid separation, and mixed the two centrifugal liquids to obtain a boiled liquid enriched in hemicellulose;

[0061] (3) Collect the remaining solids in step (2), add 2 mL of sulfuric acid to each gram of solids, the concentration of sulfuric acid is 0.4M, carry out ac...

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Abstract

The invention discloses a method for converting rice straw into xylitol at high efficiency, and relates to the technical field of biology. The method comprises the following steps of converting the hemicellulose in the steam explosive rice straw into xylose at high efficiency by a water boiling method and a microwave acid hydrolysis method; converting the xylose into the xylitol by a catalytic hydrogenation method. The method has the characteristics that the conversion yield rate is high, the purity of the product is high, and the loss rate is low; the method is simple and practical, and is suitable for treating a large amount of rice straw; a fully novel concept is provided for the high-efficiency utilization of the rice straw and the improvement of economic benefit of the rice planting,and the application prospect is broad.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to a method for efficiently transforming rice straw into xylitol. Background technique [0002] Rice straw is an important agricultural resource, which can be used for livestock and poultry feed, papermaking raw materials, building materials, biomass energy and organic fertilizer materials. my country has a long history of rice planting, with a planting area of ​​30 million hectares and rich rice straw resources. Statistics show that my country's annual output of rice straw is about 200 million tons, and rice straw, as an important biological resource, will be used more and more. At present, the use of rice straw is mainly returned to the field by machinery, but the power consumption is large, the machinery is entangled with grass, the mud is seriously blocked, and the operation effect is poor, which seriously affects the utilization of rice straw resources. The rice straw returned to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C31/18
CPCC07C29/14C08B37/0003C13K13/002C07C31/18
Inventor 乔保建任代胜付锡江夏祥华陶元平彭冲
Owner YIELEAD RICE IND
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