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Process for preparing xylose from straw

A straw and xylose technology, which is applied in the field of straw to produce xylose, can solve the problems of complex production process, high production cost, and environmental pollution, and achieve the effects of low cost, reduced process energy consumption, and high sugar content

Inactive Publication Date: 2016-02-03
蒋华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the raw materials for the production of xylose in my country are corncobs. The pretreatment of corncobs requires several processes, such as screening, dust removal, cleaning, hot water washing, dilute acid or dilute alkali washing. The production process is very complicated and the production cost is relatively high. High, straw is mainly composed of cellulose, hemicellulose, lignin and other components. In the past, most of the straw was burned as waste, which not only wastes resources, but also pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of hydrolyzed stock solution

[0018] Adopting the process of the present invention to produce xylose uses wheat dry straw, that is, wheat straw with a moisture content of 5%, and the straw is crushed through a 20-mesh sieve to make straw powder, which is air-selected while pulverizing to remove impurities, and is used in a 80° C. Hot water and sulfuric acid are prepared into 2% dilute sulfuric acid solution, and stirred with straw powder according to the ratio of material to liquid weight ratio of 1:4.5 to form a hydrolysis stock solution.

[0019] (2) The first hydrolysis

[0020] The hydrolyzed stock solution was heated for 60 minutes at a heating temperature of 100° C., and steam was evaporated while heating, so that the weight ratio of the hydrolyzed solution to liquid was reduced to 1:2 after heating. After hydrolysis, the slag is squeezed and separated to obtain xylose hydrolyzate, which is passed through CaCO 3 Neutralization, neutralization PH...

Embodiment 2

[0024] (1) Preparation of hydrolyzed stock solution

[0025] Adopting the process of the present invention to produce xylose uses dry corn stalks, that is, the water content of corn stalks is 8%, and the stalks are crushed and passed through a 15-mesh sieve to make straw powder. At the same time, wind separation is carried out to remove impurities, and hot water at 75° C. Sulfuric acid is prepared into 2.5% dilute acid solution, and stirred with straw powder according to the ratio of material to liquid weight ratio of 1:4.2 to form a hydrolysis stock solution.

[0026] (2) The first hydrolysis

[0027] The hydrolyzed stock solution was heated for 55 minutes at a heating temperature of 102° C., and steam was evaporated while heating, so that the weight ratio of the hydrolyzed solution to liquid was reduced to 1:2.5 after heating. After hydrolysis, the slag is squeezed and separated to obtain xylose hydrolyzate, which is passed through CaCO 3 Neutralization, neutralization pH ...

Embodiment 3

[0031] 1. Preparation of hydrolyzed stock solution

[0032] Adopting the process of the present invention to produce xylose uses dry sorghum stalks, that is, the water content of sorghum stalks is 10%, and the stalks are crushed and passed through a 10-mesh sieve to make straw powder, and wind separation is carried out at the same time as the crushing to remove impurities. Sulfuric acid is prepared into 3% dilute acid solution, and stirred with straw powder according to the ratio of material to liquid weight ratio of 1:4 to form a hydrolysis stock solution.

[0033] 2. The first hydrolysis

[0034] The hydrolyzed stock solution was heated at a heating temperature of 105° C. for 50 minutes, and steam was evaporated while heating, so that the weight ratio of the hydrolyzed solution to liquid was reduced to 1:3 after heating. After hydrolysis, the slag is squeezed and separated to obtain xylose hydrolyzate, which is passed through CaCO 3 Neutralization, neutralization PH = 4, a...

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Abstract

A process for preparing xylose from straw is characterized by comprising the following steps: crushing straw; sieving the crushed straw with a 10 to 20-mesh sieve to obtain straw powder; heating water up to 70-80 DEG C; then adding sulfate to prepare a 2-3% dilute sulfuric acid solution; mixing and stirring according to the weight ratio of straw powder and the dilute sulfuric acid solution of 1:(4-4.5) to prepare a hydrolysis stock solution; heating the hydrolysis stock solution for 50-60 min at the temperature of 100-105 DEG C; enabling water vapor to evaporate while heating; ensuring that the feed liquid weight ratio is reduced to be 1:(2-3) after heating of the hydrolysate; after hydrolysis, performing liquid-slag squeezing separation; neutralizing the separated liquid by CaCO3 till the pH is 3-4; then filtering to obtain xylose hydrolysate.

Description

technical field [0001] The invention relates to a process for producing xylose from straw. Background technique [0002] D-xylose is a fine needle-like crystal, sweet, with a melting point of 153-154°C and a chemical formula of C 5 h 10 o 5 , molecular weight 150. Xylose is mainly used as a raw material for the production of xylitol, and can also be used as a non-caloric sweetener for medicine, food, meat dishes, soy sauce color raw materials, oil antioxidants, food processing improvers, etc., and can also be used as industrial raw materials , to produce glycoside glycerol, and to produce trihydroxyglutaric acid instead of organic acids. [0003] The molecular formula of xylitol is C 5 h 12 o 5 , two more hydrogen than xylose, molecular weight 152, generated by hydrogenation of xylose. Xylitol is mainly used in medicine, as a therapeutic and nutritional agent for diabetics, it can improve liver function and resist ketone bodies. As an intravenous injection, it can r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00C12P7/06
CPCY02E50/10
Inventor 蒋华
Owner 蒋华
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