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High-efficiency separation and conversion method of corn stalk

A corn stalk, high-efficiency technology, applied in chemical instruments and methods, organic chemistry, lignin derivatives, etc., can solve problems such as serious corrosion of equipment by inorganic acids, high degree of cellulose decomposition, and significant safety problems, and avoid a large number of problems. Produce, improve furfural yield, and keep the structure intact.

Active Publication Date: 2019-06-14
BEIJING FORESTRY UNIVERSITY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the use of inorganic acids as catalysts has many disadvantages, such as the high degree of cellulose decomposition, which makes subsequent utilization difficult, serious corrosion of equipment by inorganic acids, and significant safety problems.
At the same time, in the single-phase system of water, once furfural is formed, it is particularly easy to degrade through resinization reaction and condensation reaction, and the degradation product is black insoluble by-product humic substance, which seriously affects the yield of furfural

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method comprises the following steps:

[0024] Separation and transformation of hemicellulose: crush corn stalks to 20-80 mesh, methyl isobutyl ketone or tetrahydrofuran and 10-30wt% sodium chloride solution form a two-phase system according to the ratio of 1:0.5-2.0, Blend corn stalks with the two-phase system, add 0.01-1.00mol / L metal nitrate as a catalyst, and rapidly raise the temperature to 120-200°C for the first reaction, the reaction temperature is 120-200°C, and the reaction time is 15- 150 minutes. After the reaction is finished, the first solid-liquid separation is first carried out to obtain the first solid and the first liquid, and then the first liquid is separated from the organic phase and the water phase to obtain the first organic phase and the first water phase, wherein the half fiber The element is converted into furfural and exists in the first organic phase, and the first aqueous phase rich in catalyst can be reused;

[0025] Sepa...

Embodiment 1

[0029] Separation and transformation of hemicellulose: crush corn stalks to 20-80 mesh, methyl isobutyl ketone and 20wt% sodium chloride solution form a two-phase system at a ratio of 1:1, and combine corn stalks with two-phase The system was blended, 0.05mol / L chromium nitrate was added as a catalyst, and the temperature was rapidly raised to 160°C for the first reaction. The reaction temperature was 160°C and the reaction time was 30 minutes. After the reaction is finished, the first solid-liquid separation is first carried out to obtain the first solid and the first liquid, and then the first liquid is separated from the organic phase and the water phase to obtain the first organic phase and the first water phase, wherein the half fiber The element is converted into furfural and exists in the first organic phase, and the first aqueous phase rich in catalyst can be reused;

[0030] Separation and conversion of cellulose: the first solid obtained is placed in a concentration ...

Embodiment 2

[0034]Separation and conversion of hemicellulose: crush corn stalks to 20-80 mesh, methyl isobutyl ketone and 10wt% sodium chloride solution form a two-phase system according to the ratio of 1:0.5, and combine corn stalks with two-phase The system was blended, 0.10 mol / L aluminum nitrate was added as a catalyst, and the temperature was rapidly raised to 160°C for the first reaction. The reaction temperature was 160°C and the reaction time was 60 minutes. After the reaction is finished, the first solid-liquid separation is first carried out to obtain the first solid and the first liquid, and then the first liquid is separated from the organic phase and the water phase to obtain the first organic phase and the first water phase, wherein the half fiber The element is converted into furfural and exists in the first organic phase, and the first aqueous phase rich in catalyst can be reused;

[0035] Separation and transformation of cellulose: the obtained first solid is placed in th...

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Abstract

The invention provides a high-efficiency separation and conversion method of corn stalk. The method includes the following steps: (1) separation and conversion of hemicellulose; (2) separation and conversion of cellulose; and (3) separation of lignin. The systematic method effectively uses corn stalks as a raw material to produce high value-added energy chemicals and materials. The hemicellulose in the corn stalk is separated and converted into furfural, and the yield of furfural is high; the cellulose is separated and converted into the high-concentration glucose liquid; and the separated lignin has a relatively complete structure through identification. The method can effectively improve the separation efficiency and utilization rate of the three major components, and has great significance for the utilization of corn stalk biomass resources and environmental protection.

Description

technical field [0001] The invention belongs to the field of separation, conversion and utilization of all components of biomass, and in particular relates to a method for efficient separation and conversion of corn stalks. Background technique [0002] China is a country with a large corn planting economy. While corn production is increasing, the total amount of discarded corn stalks can reach hundreds of millions of tons every year. As a by-product of grain, corn stalks have the advantages of being renewable, environmentally friendly, and in large quantities, and are an attractive alternative to petroleum resources. On the other hand, a large amount of corn stalks have not been effectively used, and are directly discharged into the ecosystem without systematic treatment, becoming agricultural and forestry straw waste, causing waste of resources and environmental pollution. Originally green and environmentally friendly Corn stalks have negative impacts on soil, atmosphere,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02C07G1/00C07D307/50C08H7/00
Inventor 孙润仓孙少妮李宜静曹学飞袁同琦庞博
Owner BEIJING FORESTRY UNIVERSITY
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