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Production method and device for xylose

A production method and technology of a production device, which are applied in the field of functional sugar production, can solve the problems of increasing production costs, easily producing scaling and the like, and achieve the effects of cost saving, green energy-saving manufacturing, and reduced emissions.

Pending Publication Date: 2018-04-10
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional xylose production process mainly uses a large amount of calcium carbonate or lime to neutralize the acid hydrolyzate, which consumes chemicals continuously. Calcium sulfate is difficult to handle and is prone to scaling, and xylose acid hydrolyzate attracts higher Salt; purification is mainly through multi-step evaporation, activated carbon decolorization and ion exchange to achieve the purpose of impurity removal, decolorization and desalination, which not only increases production costs, but also produces more solid waste, waste water, waste acid and waste alkali, which is incompatible with green and energy-saving manufacturing Development trend runs counter to

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  • Production method and device for xylose
  • Production method and device for xylose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Using corncobs as raw materials, add 1.5% hydrochloric acid according to the solid-to-liquid ratio of 1:5 (weight to volume ratio), and keep warm at 125°C for 3 hours. After the reaction, the acid hydrolyzate was obtained by solid-liquid separation, which contained dry matter with a refraction of 7% and a light transmittance of 3%.

[0072] After controlling the temperature of the acid hydrolyzate at 60°C, add 0.5% powdered activated carbon (weight to volume ratio), stir and keep warm for 30 minutes, then plate and frame filter to obtain a decolorizing solution with a light transmittance of 80%.

[0073] The activated carbon decolorization solution enters the nanofiltration membrane recovery system with a molecular weight of 300 Da, an operating pressure of 25 bar, and a temperature of 35°C. The nanofiltration membrane clear liquid is reused for the next acid hydrolysis, and the acid recovery rate is 50%; xylose in the nanofiltration membrane dope solution The refractio...

Embodiment 2

[0080] Using corncobs as raw materials, add 1.2% sulfuric acid according to the solid-to-liquid ratio of 1:5 (weight to volume ratio), and keep warm at 135°C for 2.5h. After the reaction, the acid hydrolyzate was obtained by solid-liquid separation, which contained dry matter with a refraction of 7% and a light transmittance of 2.5%.

[0081] After controlling the temperature of the acid hydrolyzate at 60°C, add 0.8% powdered activated carbon (weight to volume ratio), stir and keep warm for 40 minutes, then plate and frame filter to obtain a decolorizing solution with a light transmittance of 85%.

[0082] The activated carbon decolorization solution enters the nanofiltration membrane recovery system with a molecular weight of 200Da, an operating pressure of 27bar, and a temperature of 40°C. The nanofiltration membrane clear liquid is reused for the next acid hydrolysis, and the acid recovery rate is 55%; the xylose in the nanofiltration membrane dope solution The refraction i...

Embodiment 3

[0089] Bagasse is used as raw material, 1.5% hydrochloric acid is added according to the solid-to-liquid ratio of 1:5 (weight to volume ratio), and the temperature is kept at 135°C for 2.5h. After the reaction is finished, the acid hydrolyzate is obtained by solid-liquid separation, which contains dry matter with a refraction of 6% and a light transmittance of 5%.

[0090] After controlling the temperature of the acid hydrolyzate at 60°C, add 0.6% powdered activated carbon (weight to volume ratio), stir and keep warm for 30 minutes, then plate and frame filter to obtain a decolorizing solution with a light transmittance of 83%.

[0091] The activated carbon decolorization solution enters the nanofiltration membrane recovery system with a molecular weight of 200 Da, an operating pressure of 27 bar, and a temperature of 35°C. The nanofiltration membrane clear liquid is reused for the next acid hydrolysis, and the acid recovery rate is 51%; xylose in the nanofiltration membrane do...

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Abstract

The invention provides a production method for xylose, wherein corncobs, bagasse or other wood fibers are used as raw materials in the method. The method comprises the steps: 1) carrying out acid hydrolysis to obtain a xylose-containing solution; 2) carrying out activated carbon decoloration to obtain a decolorized solution; 3) making the decolorized solution enter a nanofiltration membrane recovery system, and recycling a clear liquid for next acid hydrolysis of a raw material; 4) increasing the concentration of xylose in the obtained concentrated solution, carrying out primary evaporation concentration, then, entering a chromatographic system to carry out impurity removal and desalination to obtain a chromatographic eluent; and 5) carrying out nanofiltration membrane decoloration, membrane concentration, secondary evaporation concentration, activated carbon decoloration, ion exchange, vacuum concentration and crystal centrifugation to obtain a high-quality xylose crystal.

Description

technical field [0001] The invention relates to a production method of xylose, which belongs to the technical field of functional sugar production. Background technique [0002] Xylose is a white needle-like crystal or crystalline powder, sweet in taste, only 40% of sucrose in sweetness, easily soluble in water, slightly soluble in ethanol, with dextrorotation and variable optical rotation. Xylose is a pentose sugar, used as a non-caloric sweetener in food and beverages, suitable for obese and diabetic patients. With the improvement of people's quality of life, xylose has been paid more and more attention as a sweetener, and the preparation process of xylose has also been continuously improved and perfected. [0003] The traditional xylose production process mainly uses a large amount of calcium carbonate or lime to neutralize the acid hydrolyzate, which consumes chemicals continuously. Calcium sulfate is difficult to handle and is prone to scaling, and xylose acid hydrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 赵士明李新慧张宇熊福军王金荣杨文银朱传柳彭文博杨积衡范克银
Owner JIANGSU JIUWU HITECH
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