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Method for extracting xylose from poly pentose acidolysis liquid

A technology of polypentose acid hydrolyzate and polypentose acid, which is applied in chemical instruments and methods, monosaccharides, sugar derivatives, etc., can solve the problem of "three wastes" discharge pollution to the environment, large consumption of acid and alkali, and inability to adapt and other problems, to achieve the effect of reducing costs, using less acid and alkali, and lowering costs

Active Publication Date: 2012-07-04
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned production process consumes a lot of acid and alkali in the production process, and there are serious problems such as "three wastes" discharging and polluting the environment, which cannot meet the current goal of establishing an energy-saving, emission-reducing and environment-friendly society advocated by the state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using corncob as raw material, after removing impurities, rinsing, washing with hot water, and washing with dilute sulfuric acid, it is hydrolyzed with sulfuric acid to obtain polypentose acid hydrolysate; its main components are xylose and a small amount of glucose, arabinose, etc. (Note: the following implementation The polypentose acid hydrolysate in the example is the same).

[0027] 1. Heat 45L polypentose acid hydrolysate to 80℃, add 700g light calcium carbonate, adjust pH=3.32, neutralize and remove some sulfate radicals; after keeping at 80℃ for 1h, filter, then add 220g Pre-decolorization of waste carbon (activated carbon used for decolorization of the previous acid hydrolysis solution) and heat preservation for 0.5h;

[0028] After decolorization, the sulfate content in the acid hydrolysis solution is 1432mg / L, and the calcium ion content is 580mg / L;

[0029] 2. Then add 225g powdered activated carbon and keep it at 55°C for 0.5h; the light transmittance of the acid...

Embodiment 2

[0035] 1. Heat 45L polypentose acid hydrolysate to 80℃, add 700g light calcium carbonate, adjust pH=3.24, remove part of sulfate radical; keep it at 80℃ for 1h, filter, then add 225g waste charcoal ( Activated carbon used for decolorization of the previous acid hydrolysis solution) is pre-decolorized and kept for 0.5h;

[0036] After decolorization, the sulfate content in the acid hydrolysis solution is 1495mg / L, and the calcium ion content is 520mg / L.

[0037] 2. Then add 225g powdered activated carbon and keep it at 55°C for 0.5h; the light transmittance of the acid hydrolyzate after decolorization is 78%;

[0038] 3. Perform ion exchange on the above-mentioned decolorized acid hydrolysate, first pass the strong acid type cationic resin 001*7 to make the iron ion content in the acid hydrolyzate 2mg / L; then pass the weak base anion resin D301 to make the acid hydrolysate The sulfate content is 18mg / L;

[0039] Then it is concentrated by a reverse osmosis membrane (standard desalinat...

Embodiment 3

[0043] 1. Heat 45L polypentose acid hydrolysate to 80℃, add 650g light calcium carbonate, adjust pH=3.14, remove part of sulfate radical; after keeping it at 80℃ for 1h, filter, then add 225g waste charcoal (Activated carbon used for the decolorization of the previous acid hydrolysis solution) Pre-decolorization and heat preservation for 0.5h;

[0044] After decolorization, the sulfate content in the acid hydrolysis solution was 1452 mg / L, and the calcium ion content was 480 mg / L.

[0045] 2. Then add 225g powdered activated carbon and keep it at 55°C for 0.5h; the light transmittance of the acid hydrolyzate after decolorization is 75%;

[0046] 3. Perform ion exchange on the above-mentioned decolorized acid hydrolysis solution, first pass the strong acid cation resin HZ-016 to make the iron ion content in the acid hydrolysis solution 2mg / L; then pass the weak base anion resin D315 to make the acid hydrolysis solution The sulfate content is 14mg / L;

[0047] Then it is concentrated by...

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Abstract

The invention provides a method for extracting xylose from poly pentose acidolysis liquid, including the following steps: poly pentose acidolysis liquid is neutralized by calcium carbonate, then pre-destaining is carried out, and then active carbon is used for destaining; strong acid cation resin and weak base anion resin are sequentially used for carrying out ion exchange, and then reverse osmosis membrane is used for concentration; concentrated solution is destained by active carbon column and sequentially passes through the strong acid cation resin and weak base anion resin, and finally heat response concentration and crystallization are carried out. The invention overcomes the defect that content of acetate after concentration is improved by utilizing reverse osmosis membrane concentrated acidolysis liquid, cost is reduced, and dialysate thereof can be further taken as washing water in crystallization of wood sugar, thus cost is further reduced; besides, acid-base dosage of the method in the invention is less, the method is environmentally friendly, cost is lower, productivity is high, purity is good, and the method is applicable to industrialization production.

Description

Technical field [0001] The invention relates to the technical field of sugar production, in particular to a method for separating and extracting xylose from polypentose acid hydrolysate. Background technique [0002] Xylose has more than 40 years of production experience in my country, and its production technology has reached the world level. At present, my country is already the world's largest producer and exporter of xylose, and with the development of the economy and the improvement of living standards, the domestic market continues to expand, providing very superior conditions for the further development of the xylose industry. At present, the production of xylose generally adopts a more traditional production process, which is mainly to separate and extract xylose after hydrolyzing plant raw materials containing polypentose. The plant raw materials rich in polypentose include corn cobs, straws, bagasse, etc. my country is a large agricultural country with an annual output...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H3/02C07H1/06
Inventor 李荣杰薛培俭尚海涛邓远德张雪锋张毅李倩
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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