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Gas phase acid catalytic biomass hydrolysis continuous production method of furfural

An acid catalysis and biomass technology, applied in the direction of organic chemistry, etc., can solve the problems of difficult treatment of acid-containing waste residue, low furfural content, and many side reactions, and achieve the effects of less side reactions, high furfural yield, and less discharge of three wastes

Active Publication Date: 2015-02-18
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing furfural from biomass with gas-phase acid catalysis in series with multiple kettles, which overcomes the problems of corrosion of equipment during liquid-phase acid catalysis, many side reactions, difficulty in handling acid-containing waste residues and time-consuming gas-phase acid catalysis in the furfural preparation method. Problems such as low furfural content and high energy consumption

Method used

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  • Gas phase acid catalytic biomass hydrolysis continuous production method of furfural
  • Gas phase acid catalytic biomass hydrolysis continuous production method of furfural

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Effect test

Embodiment 1

[0030] The diameter-to-height ratio of the reactor is 1:100, the amount of straw in a single reactor is 1500g, the total amount of straw in one cycle is 4500g, the mass concentration of hydrochloric acid is 5%, the steam flow rate is 15 mL / min, and the temperature in the reactor is 165 o C, according to the above operation steps, when the concentration of furfural at the outlet of reactor 3 is reduced to below 0.1%, 20.2 kg of furfural aqueous solution with a content of 1.4% is obtained, and the yield is 40%.

Embodiment 2

[0032] The ratio of diameter to height of the reactor is 1:100, the amount of straw in a single reactor is 1500g, the total amount of straw in one cycle is 4500g, the mass concentration of hydrochloric acid is 5%, the steam flow rate is 30 mL / min, and the temperature in the reactor is 155 o C, according to the above operation steps, when the concentration of furfural at the outlet of reactor 3 is reduced to below 0.1%, 15.2 kg of furfural aqueous solution with a content of 2.8% is obtained, and the yield is 60.2%.

Embodiment 3

[0034] The ratio of diameter to height of the reactor is 1:100, the amount of straw in a single reactor is 1500g, the total amount of straw in one cycle is 4500g, the mass concentration of hydrochloric acid is 5%, the steam flow rate is 25 mL / min, and the temperature in the reactor is 145 o C, according to the above operation steps, when the concentration of furfural at the outlet of reactor 3 is reduced to below 0.1%, 8.0 kg of furfural aqueous solution with a content of 8% is obtained, and the yield is 90.5%.

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Abstract

The invention discloses a gas phase acid catalytic biomass hydrolysis continuous production method of furfural and belongs to the field of chemical industry. The method includes that straw is used as a raw material, superheated steam and gas-phase acid are led in, a multi-kettle series connection gas phase acid catalyzed hydrolysis method is adopted, the straw performs hydrolysis reaction in the gas phase acid, the furfural is prepared, concentration of acid in the superheated steam is 1-30%, and hydrolysis reaction temperature is 110-180 DEG C. The gas phase acid catalytic biomass hydrolysis continuous production method of the furfural has the advantages of being wide in raw material sources, small in side reaction, high in furfural yield, low in energy consumption, simple in waste water and waste residue treatment, small in waste gas, waste water and waste residue emission and the like and is convenient for industrial production.

Description

technical field [0001] The invention relates to a method for continuous production of furfural by gas-phase acid-catalyzed hydrolysis of biomass, which belongs to the field of chemical industry. Background technique [0002] Furfural is an important organic chemical raw material obtained by hydrolysis of wood and agricultural by-products, and is widely used in synthetic resin, medicine, dyestuff, petrochemical and other departments. Furfural is my country's bulk chemical export commodity, and its trade volume ranks second in the world. The main raw materials for the production of furfural in my country are corncobs, cottonseed husks, bagasse, rice husks, camellia husks, sunflower husks, sorghum husks, etc. The methods for producing furfural mainly include hydrochloric acid method, sulfuric acid method, improved sulfuric acid method, acetic acid method, and inorganic salts. The above-mentioned methods are liquid-phase catalyzed preparation of furfural, and there are disadva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/50
Inventor 余学军雷廷宙李中贤何晓峰徐丹任素霞梁志宏朱金陵董学亮
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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