Improved process for clean production of xylose

A clean production and xylose technology, applied in the direction of monosaccharides, sugar derivatives, sugar derivatives, etc., can solve the problems of high refining cost, unfavorable enzyme penetration, and many side reactions, so as to improve the chromatographic separation efficiency and reduce impurities The effect of shortening the adhesion and steam explosion time

Inactive Publication Date: 2017-03-15
FUTASTE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. 200610040383.0 describes a similar method in the patent "Enzymatic Preparation of Xylose", but there are the following deficiencies: 1. The pretreatment mentioned in this method refers to alkali extraction or steam explosion, and does not specify the specific process parameters , different steam explosion equipment and conditions result in different sugar liquid components that directly affect the amount of enzyme added, so it belongs to insufficient disclosure; The sugar solution after enzymatic hydrolysis contains a large amount of xylan and other unlabeled miscellaneous sugars, and the purity of xylose is less than 50%. It is well known that the crystallization purity of xylose needs to reach more than 75%.
3. Using ethanol to precipitate impurities, the cost of ethanol is high, the operating environment is poor, the effect of removing impurities is not obvious, and industrial production is not cost-effective
[0005] Patent No. 200510045325.2 mentions a similar process in the patent "A Method for Enzymatic Production of Xylose", but there are the following deficiencies: 1. The said pretreatment of the method refers to high-pressure cooking or steam explosion, and high-pressure Cooking conditions, however, the plant fiber hemicellulose after high-pressure cooking is not stripped out, which is not co

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] 1) Raw material pretreatment: the steam explosion equipment is pre-heated to 120°C, the bagasse is continuously poured into the steam explosion equipment after being washed with water, the material residence time is 60min, the steam explosion temperature is 120°C, and the material is sprayed to the cyclone every 2s , Use mechanical steam recompression device to recover the separated steam and circulate it to the steam inlet of steam explosion equipment, and the agricultural and forestry waste after steam explosion is introduced into the enzymolysis tank;

[0033] 2) Enzymatic hydrolysis: adjust the dry matter content of the material in the enzymatic hydrolysis tank to 30% with pure water, adjust the pH to 5.7, control the system temperature to 57°C, add the enzyme system at 5‰ of the dry matter weight of the raw materials, and keep it warm for 10 hours;

[0034] 3) Solid-liquid separation: filter the enzymatically hydrolyzed material with a plate and frame ...

Example Embodiment

[0040] Example 2:

[0041] 1) Raw material pretreatment: the steam explosion equipment is pre-heated to 160°C, the corn cobs are soaked in dilute sulfuric acid solution with a concentration of 0.5% by mass for 5 hours and then continuously put into the steam explosion equipment. The residence time of the materials is 5min, and the steam explosion temperature is 160°C. Discharge the material to the cyclone separator every 2s, use a mechanical steam recompression device to recover the separated steam, and circulate it to the steam inlet of the steam explosion equipment, and the agricultural and forestry waste after steam explosion is introduced into the enzymolysis tank;

[0042] 2) Enzymatic hydrolysis: adjust the dry matter content of the material in the enzymatic hydrolysis tank to 10% with pure water, adjust the pH to 3.0, control the temperature of the system at 40°C, add the enzyme system at 1‰ of the dry matter mass of the raw materials, and keep it warm for 30h;

[0043] 3) Sol...

Example Embodiment

[0049] Example 3

[0050] 1) Raw material pretreatment: the steam explosion equipment is preheated to 140℃, the birch bark is soaked in 0.2% dilute sulfuric acid solution for 5h, and then continuously put into the steam explosion equipment, the material residence time is 8min, the steam explosion temperature is 140℃, every 2s Spray materials to the cyclone separator, use a mechanical steam recompression device to recover the separated steam, and circulate it to the steam inlet of the steam explosion equipment, and the agricultural and forestry waste after steam explosion is introduced into the enzymolysis tank;

[0051] 2) Enzymatic hydrolysis: adjust the dry matter content of the enzymatic hydrolysis tank to 20% with pure water, adjust the pH to 5.5, control the system temperature at 50°C, add the enzyme system at 2‰ of the dry matter weight of the raw materials, and keep it warm for 24h;

[0052] 3) Solid-liquid separation: filter the enzymatically hydrolyzed material with a plate ...

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PUM

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Abstract

The invention discloses an improved process for clean production of xylose. The process comprises the steps that forestry and agricultural residues are subjected to pretreatment of raw material, enzymolysis, solid-liquid separation, concentration, pre-decoloration and chromatographic separation and purification, and then refining and crystallization of xylose are achieved and purification and crystallization of arabinose are achieved. The improved process for clean production of xylose has the advantages that the steam explosion temperature is relatively low, and a continuous production is achieved through a steam explosion technology; xylan in the raw materials are transformed to xylose and the transformation rate reaches 95% or above; moreover, impurities in a xylose solution are reduced, the steam explosion time is greatly shortened, water consumption is reduced, chromatographic separation resin is protected, the service life of the resin is prolonged, steam is effectively saved and the steam explosion cost is reduced.

Description

technical field [0001] The invention relates to the technical field of xylose production, in particular to an improved clean xylose production process. Background technique [0002] The traditional xylose production process is an acid hydrolysis process, specifically decolorizing, desalting, concentrating, etc. The step of refining is crystallization and centrifugation to obtain crystalline xylose after purification. In this process, the content of sulfate ions is high, and the desalination process consumes a lot of acid and alkali and water, which is the main source of sewage in xylose production. At the same time, sulfuric acid can inhibit the activity of anaerobic bacteria in activated sludge. [0003] The patent No. 201410701716.4 "A Process for Clean Production of Xylose" mentioned a production process similar to enzymatic preparation of xylose. The present invention made the following improvements on the basis of this patent: 1. Continuous steam explosion 2. Reduce t...

Claims

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Application Information

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IPC IPC(8): C12P19/14C12P19/02C07H1/06C07H3/02
CPCC12P19/14C07H1/06C07H3/02C12P19/02
Inventor 李毅袁敏张瑞瑞沈丽丽徐望晖张颖王云
Owner FUTASTE PHARM CO LTD
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