Method for preparation of xylose and co-production of sodium sulfate by employing viscose fiber squeeze liquid as raw material

A viscose fiber and squeezing liquid technology, applied in xylose production, sodium sulfate recovery, sugar production, etc., can solve the problems of large power consumption, secondary pollution, large amount of

Inactive Publication Date: 2017-06-23
南京凯通粮食生化研究设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution after acidolysis needs to be desalted and purified. The desalted methods generally include traditional ion exchange technology, membrane filtration and electrodialysis technology. Acid and waste alkali cause secondary pollution; CN104311391B mainly uses membrane technology to remove impurity ions; CN101792822B mainly uses electrodialysis technology to remove impurity ions, which consumes a lot of electric energy
The above-mentioned desalination technologies are not easy to deal with such high-salt solutions, and a large number of devices, consumables and energy are necessary, and the cost is very high, making it difficult to realize industrialization
[0008] After extracting hemicellulose through membrane separation, there are still high levels of hemicellulose and sodium hydroxide in the raffinate, which are generally treated as waste, and the raw materials are not fully utilized, increasing the pressure on environmental protection

Method used

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  • Method for preparation of xylose and co-production of sodium sulfate by employing viscose fiber squeeze liquid as raw material
  • Method for preparation of xylose and co-production of sodium sulfate by employing viscose fiber squeeze liquid as raw material
  • Method for preparation of xylose and co-production of sodium sulfate by employing viscose fiber squeeze liquid as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Take the viscose fiber squeeze liquid, the alkali mass percentage concentration in the solution is 12%, the hemicellulose mass percentage concentration is 10%, the refractive concentration is 31%, and the conductivity is 500000~800000 μs / cm, dilute the squeeze liquid with pure water to the refractive index Concentration of 18.0%, while stirring, add sulfuric acid solution with a volume concentration of 50% for neutralization, adjust to pH=7.0±0.1, the solution changes from brownish yellow to milky yellow or milky white, and a neutralizing solution is obtained. Add pure water to dilute the neutralizing solution to a refractive concentration of 8.0±1%, then add a sulfuric acid solution with a volume concentration of 50% while stirring, adjust to pH=0.8, and react with acid for 3 hours at 120°C, and the solution turns brownish-yellow to half Transparent liquid with good fluidity. Add 1% powdered activated carbon by dry matter weight, stir and decolorize at 75°C for 1 hour,...

Embodiment 2

[0064] The reaction solution obtained in Example 1 contains a high concentration of sodium sulfate, and the conductivity is 550000 μs / cm. The reaction solution obtained in Example 1 is evaporated and concentrated to a concentration of 30.0~40.0% by mass, cooled to below 10°C, and crystallized by cooling. Centrifuge dehydration separation to obtain primary crystalline sodium sulfate crude product and primary crystallization mother liquor.

[0065] The conductivity of primary crystallization mother liquor is 100000~120000 μs / cm. The primary crystallization mother liquor still contains a large amount of sodium sulfate.

[0066] Evaporate and concentrate the primary crystallization mother liquor to a mass percent concentration of 40.0±5.0%, lower the temperature to below 10°C, cool and crystallize, and centrifuge to obtain the secondary crystallization sodium sulfate crude product and the secondary crystallization mother liquor. The conductivity of the secondary crystallization m...

Embodiment 3

[0069] The secondary crystallization mother liquor obtained in Example 1 was deionized by continuous automatic ion exchange method.

[0070] The device and operation process adopted by the continuous automatic ion exchange method will be further described below in conjunction with the accompanying drawings.

[0071] The continuous automatic ion exchange device adopted in the present invention adopts a group of 22 cation resin columns and a group of 22 anion resin columns. The resin columns are formed in series, and the upper part of the previous resin column is connected with the lower part of the subsequent resin column through pipelines and connecting valves.

[0072] In the continuous automatic ion exchange device adopted in the present invention, the cation exchange operates periodically and automatically, and one cycle is composed of 22 processes, that is, process 1 to process 22, which is repeated; the anion exchange is periodically operated automatically, and one cycle ...

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Abstract

The invention provides a method for preparation of xylose and co-production of sodium sulfate by employing a viscose fiber squeeze liquid as raw material. The method comprises the following processing processes: neutralizing the viscose fiber squeeze liquid by using sulfuric acid, carrying out acidolysis, decoloration and concentration, and removing ions through a crystallization process; carrying out primary crystallization to obtain sodium sulfate coarse crystal and a primary crystallization mother liquor; carrying out recrystallization on the primary crystallization mother liquor to obtain sodium sulfate coarse crystal and a secondary crystallization mother liquor; dissolving the sodium sulfate coarse crystal obtained through two times of crystallization, then carrying out recrystallization, centrifugal separation and drying to obtain a sodium sulfate crystal product; concentrating the secondary crystallization mother liquor, removing the ions through a continuous automatic ion exchange method and then separating and purifying xylose by using a simulated moving bed chromatographic separation device to obtain a xylose solution and a hybrid syrup solution; and carrying out concentrating, crystallization, centrifugal separation and drying on the xylose solution to obtain a xylose crystal product.

Description

technical field [0001] The invention relates to a production and preparation method of xylose, in particular to a method for preparing xylose by hydrolyzing alkaline hemicellulose as a raw material. Background technique [0002] Viscose fiber is the main species of man-made chemical fiber and is widely used in the textile industry. The preparation of viscose fiber generally uses pulp and cypress as raw material. After leaching with high-concentration sodium hydroxide alkaline solution, the cellulose in the raw material is transformed into alkali cellulose, and the hemicellulose is dissolved out, and then the hemicellulose is extracted by pressing. The element is removed to obtain massive alkali cellulose. Alkali cellulose is processed through crushing, aging, yellowing, dissolving, ripening, defoaming and other processes to obtain viscose fiber. [0003] The squeeze liquid obtained by pressing is rich in alkali and hemicellulose, therefore, the technology of extracting alk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00C01D5/16C01D5/00
CPCC01D5/00C01D5/006C01D5/16C13K13/002
Inventor 李瑛曹嫒周日尤吴鹏
Owner 南京凯通粮食生化研究设计有限公司
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