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Xylose preparation method

A xylose and equipment technology, applied in the field of xylose preparation, can solve the problems of large sewage discharge, high steam consumption, large water consumption, etc. Effect

Active Publication Date: 2014-02-05
SHANDONG FUTASTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of large water consumption, large sewage discharge and high steam consumption in the existing xylose preparation method, and provide a clean and efficient xylose preparation method that saves water, reduces consumption, reduces pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Corn cob hydrolysis

[0027] Take corncobs, add sulfuric acid solution with a mass concentration of 2.5%, heat at 135°C for 3 hours, and obtain xylose liquid. The dry matter content in the xylose liquid is 7% by mass, and the light transmittance is 3.2%.

[0028] (2) One decolorization

[0029] Add activated carbon according to 4% of the dry matter mass in the xylose solution, keep it warm at 86°C for 20 minutes, filter and remove the activated carbon, and obtain a xylose primary decolorization solution with a light transmittance of 65%.

[0030] (3) Protection filter

[0031] Filter the xylose primary decolorization solution through a gauze bag to remove solid impurities and protect the electrodialysis membrane.

[0032] (4) Membrane ultrafiltration

[0033] After protecting and filtering the xylose liquid, use the acid-resistant roll-type membrane ultrafiltration with a membrane pore size of 5000 to remove the colloidal impurities that cannot be removed by acti...

Embodiment 2

[0041] (1) Corn cob hydrolysis

[0042] Take corncobs, add sulfuric acid solution with a mass concentration of 1.7%, heat at 115°C for 2.5 hours, and obtain xylose liquid. 7% of the dry matter mass in the liquid was added with activated carbon, kept at 70°C for 33 minutes, and filtered to remove the activated carbon to obtain a xylose primary decolorization liquid with a light transmittance of 75%.

[0043] (2) Electrodialysis desalination

[0044] A homogeneous electrodialysis membrane is used to filter the xylose primary decolorization solution to remove sulfuric acid, salts and other electrolytes, and the conductivity of the xylose solution is reduced to 605 μs / cm.

[0045] (3) Membrane concentration

[0046] The xylose liquid after desalination by electrodialysis is concentrated by the material reverse osmosis membrane, and the mass percentage of dry matter in the concentrated xylose liquid is 18.3%.

[0047] (4) Concentration, decolorization, ion exchange, concentration,...

Embodiment 3

[0050] (1) Steam Explosion Corn Stalks

[0051] Crush 500g of corn stalks into small pieces of about 1cm square, add 8000ml of 1.1% hydrochloric acid solution by weight, soak at room temperature for 17 hours, and separate the solid and liquid to obtain the acidified corn stalks. Put the acidified corn stalks into the steam explosion equipment During the process, the steam was boosted to 1.1Mpa, and the pressure was maintained for 4.5min. The steam-exploded corn stalk mud obtained was washed with hot water for many times, and the washing liquid was combined to obtain the xylose liquid. The dry matter mass percentage was 4.1%.

[0052] (2) One decolorization

[0053] Add activated carbon according to 10% of the dry matter mass in the xylose solution, keep it warm at 50°C for 10 minutes, filter and remove the activated carbon, and obtain a xylose primary decolorization solution with a light transmittance of 72%.

[0054] (3) Membrane ultrafiltration

[0055] Utilize the ac...

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Abstract

The invention provides a xylose preparation method. The xylose preparation method mainly comprises the following steps: treating a raw material containing celluloses and hemicelluloses so as to obtain a xylose-containing solution; destaining the xylose-containing solution by using activated carbon, and then purifying the xylose-containing solution so as to obtain a destaining solution; carrying out protective filtration and / or spiral-wound membrane filtration on the destaining solution, then carrying out single vaporization and concentration on the destaining solution, desalting by using electrodialysis equipment so as to obtain electrodialysis liquid, carrying out membrane concentration on the electrodialysis liquid so as to obtain a membrane concentrated solution, finally carrying out single vaporization and concentration, destaining by using the activated carbon, carrying out ion exchange and secondary vaporization and concentration, crystallizing and centrifuging so as to obtain xylose crystals. The xylose preparation method has the advantages that the acid-base consumption and the water consumption are reduced by using electrodialysis desalination and membrane concentration for replacing calcium carbonate or lime neutralization, primary ion exchange and primary evaporation and concentration in a conventional technology, water can be saved by 55-75%, and the sewage discharge is substantially reduced; and the purposes of energy conservation, consumption reduction, pollution reduction and clean and efficient production are realized by adopting the technology.

Description

technical field [0001] The invention belongs to the technical field of functional sugar production, and in particular relates to a preparation method of xylose. Background technique [0002] Xylose is a kind of pentose sugar, which is extracted from agricultural wastes containing cellulose and hemicellulose, such as corncobs, bagasse, cottonseed hulls, papermaking wastewater, etc., and is purified by neutralization-decolorization-yang, yin, and yang. Purification - primary evaporation and concentration - secondary purification and purification of yin, yang and yin - secondary evaporation and concentration - crystallization - centrifugation - drying and other processes to prepare white crystals, according to this process to prepare xylose products, the process is long and consumes water, There are many auxiliary materials such as electricity, steam, acid, alkali, etc., especially the large amount of sewage generated, which causes certain harm to the environment. The neutraliz...

Claims

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Application Information

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IPC IPC(8): C13K13/00
Inventor 孙鲁杜瑞锋王成福邱学良黄伟红李毅姜希生
Owner SHANDONG FUTASTE
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