System and method for preparing refined xylose and fermentable sugar from corn straw

A technology for fermenting corn stalks and sugar, applied in chemical instruments and methods, fermentation, preparation of sugar derivatives, etc., can solve problems such as high cost, high energy consumption, and reduced xylose yield, so as to save time and cost, increase The loss of xylose and the effect of simplifying the process

Pending Publication Date: 2022-04-01
ZHEJIANG HUAKANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology directly treats agricultural waste with sulfuric acid. Due to the high concentration of sulfuric acid used, on the one hand, part of the xylose will be converted into other substances such as furfural, which will reduce the yield of xylose. On the other hand, it will introduce lignin and plant cell wall Impurities such as colloids are not conducive to the subsequent separation, extraction and utilization of xylose
In addition, auxiliary treatment by steam explosion and other methods requires high temperature and high pressure, large energy consumption, and high cost

Method used

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  • System and method for preparing refined xylose and fermentable sugar from corn straw
  • System and method for preparing refined xylose and fermentable sugar from corn straw
  • System and method for preparing refined xylose and fermentable sugar from corn straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0041] Embodiment 2 acid hydrolysis

[0042] In this example, 10 groups of acid hydrolysis experiments were carried out on the alkali-treated corn stalk residue, and the specific implementation scheme and experimental result data are shown in Table 4 and Table 5 respectively.

[0043] The acid hydrolysis experiment was carried out on the corn stalk residue after being treated with the optimal alkali treatment conditions. When the acid concentration was 2%, the maximum xylose yield was 80.64%. At this time, the hemicellulose content in the acid hydrolysis residue was 3.51%, and the cellulose The content is 64.70%.

[0044] Table 4 Acid hydrolysis results of alkali-treated corn stalk residue

[0045]

[0046] Other reaction conditions: solid-to-liquid ratio 1:8, reaction temperature 125°C, reaction time 140min. The hemicellulose content of corn stalks is 21.50%, and the average hemicellulose content in the straw residue after alkali treatment is 23.25%.

[0047] As can be ...

Embodiment 3

[0052] Example 3 Preparation of Refined Xylose

[0053] In this embodiment, after the hydrolyzed solution undergoes neutralization, decolorization, one-time separation, and concentrated crystallization processes in sequence, xylose crystals are obtained, and the purity of xylose is above 99.5%. Based on the xylose content in the hydrolyzate, the yield of crystal xylose is 26.5%. Throughout the refining process, the xylose crystallization mother liquor will be repeatedly concentrated and crystallized for use.

[0054] The decolorization and separation process will cause some loss of xylose. Compared with the four separations (xylose loss rate > 17%) adopted in the prior art, the embodiment of the present invention uses one separation to reduce the xylose loss rate. Nearly 1% (xylose loss <16.2%).

[0055] Compared with the existing refining process that adopts four separations, because the previous alkali treatment has removed most of the non-xylose impurities that are easily...

Embodiment 4

[0058] Embodiment 4 Acid hydrolysis residue prepares glucose

[0059] The acid hydrolysis residue obtained after dilute alkali-dilute acid treatment is added to Novozymes Ctec2 cellulase for enzymolysis. The glucose concentration of 20% dry basis enzymatic hydrolysis can reach 146g / L, and the concentration of 25% dry basis enzymatic hydrolysis glucose can reach 177g / L, obtained as image 3 The corresponding curves of enzymatic hydrolysis glucose concentration and enzymatic hydrolysis time are shown. In the patent with publication number CN112522347A, the test parameters for preparing enzymatic glucose are disclosed as follows: 20% dry basis, glucose concentration 120g / L; 25% dry basis, glucose concentration 140g / L. Therefore, the comparison of the test data shows that the glucose concentration prepared by the method of the present invention is nearly 20% higher than that of the prior art method.

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Abstract

The invention relates to a system for preparing refined xylose and fermentable sugar from corn straw. Comprising a premixing tank, an alkali treatment tank, an acidolysis tank, an enzymolysis tank, a neutralizing tank, a decolorizing tank, a decolorizing post-tank, an ion exchange device, an ion exchange post-tank, an evaporator, a crystallizing tank, a plurality of material conveying pumps, a plurality of valves, a first centrifugal machine, a second centrifugal machine and a third centrifugal machine, the system is further provided with a concentrated alkali tank, the concentrated alkali tank is sequentially connected with an alkali treatment tank and an acidolysis tank, and the decoloration tank is connected with a carbon preparation tank for dissolving activated carbon. The invention also discloses a method for preparing refined xylose and fermentable sugar from corn straws by using the system. The dilute alkali treatment and the dilute acid treatment are performed in one step, multi-stage treatment is not needed, the process is simplified, and the method has the characteristics of simple process, cost saving and the like.

Description

technical field [0001] The invention belongs to the technical field of sugar alcohol preparation, and in particular relates to a system and method for preparing refined xylose and fermentable sugar from corn stalks. Background technique [0002] At present, the process of using hemicellulose in agricultural waste to extract xylose and fermentable sugar in the fields of food and chemical industry is mainly to directly treat agricultural waste with sulfuric acid, hydrolyze the hemicellulose component to obtain xylose, and then hydrolyze Wherein the cellulose component obtains a fermentable glucose solution. As the patent of Publication No. CN112661975A handles bamboo scraps with sulfuric acid, then separates xylose from the hydrolyzate. However, sulfuric acid is used to treat agricultural waste directly. In order to hydrolyze hemicellulose into xylose as much as possible, a relatively high concentration of sulfuric acid is often added. On the one hand, some xylose will be con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H1/00C07H1/06C12P19/02
CPCC07H1/06C07H1/00C07H3/02C12P19/02
Inventor 李勉严良聪胡昌辉杨铭乾罗家星杨武龙甄妮曾方明
Owner ZHEJIANG HUAKANG PHARMA
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