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Method for producing xylose from wheat straws

A technology of wheat straw and xylose, applied in the production of sugar, sugar production, xylose production and other directions, can solve the problems of air pollution, occupation of land resources, etc., and achieve the effect of improving economic value, high quality and good color.

Inactive Publication Date: 2015-06-17
高枫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wheat straw is a waste of agricultural production, random stacking will occupy land resources, and burning will pollute the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for producing xylose from wheat straw, comprising the following steps:

[0018] 1) Cut the wheat straw into 0.1-1cm long, add water and heat to 80°C, and keep it for 20 minutes;

[0019] 2) Add dilute sulfuric acid with a mass fraction of 3.5% in water, the mass ratio of wheat straw to dilute sulfuric acid is 1:3.5, heat the water to 105°C, and keep it for 2.5 hours, filter the filtrate, and concentrate the filtrate to 33% of the original volume , to obtain straw hydrolyzate;

[0020] 3) Add calcium carbonate to the straw hydrolyzate to neutralize to pH 3.5, add 1% activated carbon by weight of the hydrolyzate, stir at 45°C for 60 minutes, filter the filtrate to obtain a decolorizing solution, which is then absorbed by resin and concentrated to 55% of the original volume, then distilled, crystallized and dried to obtain xylose crystals.

Embodiment 2

[0022] A method for producing xylose from wheat straw, comprising the following steps:

[0023] 1) Cut the wheat straw into 0.1-1cm long, add water and heat to 70°C, and keep it for 15 minutes;

[0024] 2) Add dilute sulfuric acid with a mass fraction of 3.5% in water, the mass ratio of wheat straw to dilute sulfuric acid is 1:4, heat the water to 100°C and keep it for 2.5 hours, filter the filtrate, and concentrate the filtrate to 35% of the original volume , to obtain straw hydrolyzate;

[0025] 3) Add calcium carbonate to the straw hydrolyzate to neutralize to pH 3, add activated carbon with 1% weight of the hydrolyzate, stir at 50°C for 30 minutes, filter the filtrate to obtain a decolorized solution, which is then absorbed by resin and concentrated to the original 55% of the volume, then distilled, crystallized and dried to obtain xylose crystals.

Embodiment 3

[0027] A method for producing xylose from wheat straw, comprising the following steps:

[0028] 1) Cut the wheat straw into 0.1-1cm long, add water and heat to 80°C, and keep it for 20 minutes;

[0029] 2) Add dilute sulfuric acid with a mass fraction of 3.5% in water, the mass ratio of wheat straw to dilute sulfuric acid is 1:3, heat the water to 105°C and keep it for 3 hours, filter the filtrate, and concentrate the filtrate to 30% of the original volume , to obtain straw hydrolyzate;

[0030] 3) Add calcium carbonate to the straw hydrolyzate to neutralize to pH 3.5, add 1.5% activated carbon by weight of the hydrolyzate, stir at 40°C for 60 minutes, filter the filtrate to obtain a decolorized solution, which is then absorbed by resin and concentrated to 60% of the original volume, then distilled, crystallized and dried to obtain xylose crystals.

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Abstract

The invention discloses a method for producing xylose from wheat straws, which comprises the following steps: 1) cutting the wheat straws into 0.1-1cm length, adding water, heating to 70-90 DEG C, and keeping for 10-20 minutes; 2) adding 3.5 wt% dilute sulfuric acid (the mass ratio of the wheat straws to the dilute sulfuric acid is 1:(3-4)), heating to 100-110 DEG C, keeping for 2-3 hours, filtering, and concentrating the filtrate to 30-35% of the original volume, thereby obtaining a straw hydrolysate; and 3) adding the straw hydrolysate into calcium carbonate for neutralization until the pH value is 3-4, adding activated carbon which accounts for 0.5-1.5 wt% of the hydrolysate, stirring at 40-50 DEG C for 30-90 minutes, filtering, taking the filtrate, adsorbing with a resin, concentrating to 50-60% of the original volume, distilling, crystallizing, and drying to obtain the xylose crystal. By using the wheat straws as the raw material, the method effectively utilizes the agricultural waste, changes wastes into valuable substances, and enhances the economic value. The prepared xylose has the advantages of favorable color and high quality.

Description

technical field [0001] The invention relates to a method for producing xylose with wheat straw. Background technique [0002] D-xylose, usually fine needle-like crystals, sweet taste, melting point 153-154°C, chemical formula C5H10O5, molecular weight 150, is mainly used as raw material for the production of xylitol. In addition, xylose can also be used as a non-caloric sweetener for food flavoring agents, soy sauce color raw materials, oil antioxidants, food processing improvers, etc.; and as an industrial raw material for the production of glycoside glycerin Hydroxyglutaric acid in place of organic acids. Therefore, xylose plays an important role in the fields of food, medicine, chemical industry, leather, tobacco and cosmetics, and has important economic and social values. Wheat straw is a waste of agricultural production. Random stacking will occupy land resources, and incineration will pollute the atmosphere. Therefore, using wheat straw to prepare xylose is an effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 高枫
Owner 高枫