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Method for preparing 2-methyltetrahydrofuran from waste biomass

A technology of methyl tetrahydrofuran and waste biomass, applied in the direction of organic chemistry, etc., can solve the problems of low production capacity of 2-Me-THF, the overall production capacity is less than 5,000 tons, and the price of products remains high, and achieves low cost and good economic benefits. , the effect of improving productivity

Active Publication Date: 2012-07-11
北京雷恩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's 2-Me-THF production capacity is low, and the overall production capacity is less than 5,000 tons per year, while the domestic market demand is about 500,000 tons per year, and the product still needs to be imported in large quantities, resulting in high prices for this product
The diol method can be prepared by dehydrating 2-methyl-1,4-butanediol with pentaethoxyphosphorus as a catalyst and dichloromethane as a solvent. This method has mild conditions, high yield, and relatively low equipment requirements. Low, but the raw materials are rare, and it is easy to cause environmental pollution, so it is difficult to promote
The advantage of this method is that 2-Me-THF is prepared in one step with a single catalyst; the disadvantage is that under this reaction condition, the selectivity of 2-Me-THF is low, and a large part of furfural undergoes decarbonylation reaction, and the catalyst used is For precious metals with a content of about 5wt%, the catalyst is expensive

Method used

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  • Method for preparing 2-methyltetrahydrofuran from waste biomass
  • Method for preparing 2-methyltetrahydrofuran from waste biomass
  • Method for preparing 2-methyltetrahydrofuran from waste biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preparation of furfural and levulinic acid

[0033] 1. Raw material pretreatment:

[0034] After crushing soybean straw with a moisture content of 15% into 0.5-1cm fragments, adding tap water, stirring and mixing to obtain a biomass slurry with a moisture content of 65%, wherein the weight ratio of tap water to soybean straw is 1: 1;

[0035] 2. The first step acid hydrolysis reaction:

[0036] Put the above-mentioned biomass slurry into a premix tank, add concentrated sulfuric acid (mass percentage concentration is 98%) in the tank, and after mixing evenly, send the slurry sulfuric acid mixture into the first reactor with a plunger type high-pressure pump. The bottom of the reactor is fed with high-temperature and high-pressure steam to increase the temperature and pressure in the first reactor, and the first step of acid hydrolysis reaction is carried out to obtain the first step to acid hydrolysis mixture. The mass ratio of biomass slurry to concentrated sulfuri...

Embodiment 2

[0081] 1. Preparation of furfural and levulinic acid

[0082] 1. Raw material pretreatment:

[0083] After crushing sunflower shells with a moisture content of 15% into 0.5-1cm fragments, adding tap water, stirring and mixing to obtain a biomass slurry with a moisture content of 60%, wherein the weight ratio of tap water to soybean straw is 0.82: 1;

[0084] 2. The first step acid hydrolysis reaction:

[0085] Put the above-mentioned biomass slurry into a premix tank, add concentrated sulfuric acid (mass percentage concentration is 98%) in the tank, and after mixing evenly, send the slurry sulfuric acid mixture into the first reactor with a plunger type high-pressure pump. The bottom of the reactor is fed with high-temperature and high-pressure steam to increase the temperature and pressure in the first reactor, and the first step of acid hydrolysis reaction is carried out to obtain the first step to acid hydrolysis mixture. The mass ratio of biomass slurry to concentrated s...

Embodiment 3

[0124] 1. Preparation of furfural and levulinic acid

[0125] 1. Raw material pretreatment:

[0126] After crushing corncobs with a moisture content of 20% into fragments of 0.5-1 cm, adding tap water, stirring and mixing to obtain a biomass slurry with a moisture content of 60%, wherein the weight ratio of tap water to soybean stalks is 0.67: 1;

[0127] 2. The first step acid hydrolysis reaction:

[0128] Put the above-mentioned biomass slurry into a premix tank, add concentrated sulfuric acid (mass percentage concentration is 98%) in the tank, and after mixing evenly, send the slurry sulfuric acid mixture into the first reactor with a plunger type high-pressure pump. The bottom of the reactor is fed with high-temperature and high-pressure steam to increase the temperature and pressure in the first reactor, and the first step of acid hydrolysis reaction is carried out to obtain the first step to acid hydrolysis mixture. The mass ratio of biomass slurry to concentrated sulf...

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Abstract

The invention discloses a method for preparing 2-methyltetrahydrofuran from waste biomass, which comprises the following steps: carrying out acid hydrolysis reaction on the waste biomass to obtain furfural and levulinic acid; sequentially carrying out first hydrogenation reaction and second hydrogenation reaction on the furfural to obtain the 2-methyltetrahydrofuran; and carrying out hydrogenation reaction on the levulinic acid to obtain the 2-methyltetrahydrofuran. The method provided by the invention more sufficiently utilizes the waste biomass, and adopts non-noble metal catalysts, thereby lowering the production cost.

Description

technical field [0001] The invention relates to a method for preparing 2-methyltetrahydrofuran, in particular to a method for preparing 2-methyltetrahydrofuran by using waste biomass. Background technique [0002] 2-Methyltetrahydrofuran (hereinafter referred to as 2-Me-THF) is an important biogasoline fuel, high-end environmental solvent and chemical intermediate. When used as bio-gasoline fuel, it can be miscible with gasoline in any proportion, and has excellent properties such as oxidation and vapor pressure. Studies have shown that its proportion in gasoline can exceed 60% by volume, and it will not have any impact on engine performance, and the fuel consumption of automobiles will not increase. Using it as a gasoline additive can have higher economic value. In addition, 2-Me-THF can also be used as a co-solvent for ethanol, which can reduce the pressure of ethanol and increase the mixing ratio. The exhaust emission is 45-50% lower than that of the existing fuel ethano...

Claims

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Application Information

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IPC IPC(8): C07D307/06
Inventor 颉二旺张维
Owner 北京雷恩新材料科技有限公司
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