Method for producing furfural through lignocellulose bio-refinery

A technology for lignocellulose and biorefinery, applied in the direction of organic chemistry, etc., can solve the problems of concentrated pentose polysaccharide solution foam generation, low concentration of pentose polysaccharide solution, low efficiency of dehydration and cyclization of pentose, etc. The effect of cleaner production, energy saving and emission reduction, improving the conversion rate of raw materials and shortening the production cycle

Inactive Publication Date: 2016-12-14
广西中基信汇科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the "two-step process" of furfural is only theoretical research in the laboratory. Due to the immature technology, process and equipment, large-scale production has not been carried out. The main performances are as follows: low extraction efficiency of pentosan and high loss rate of cellulose , reduced fiber strength, low concentration of pentosan solution, severe foaming in concentrated pentosan solution, low efficiency of dehydration and cyclization of pentose, low yield of furfural, etc.

Method used

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  • Method for producing furfural through lignocellulose bio-refinery

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Effect test

Embodiment 1

[0041] A method for producing furfural by lignocellulose biorefining, comprising the following steps:

[0042] (1) Raw material pretreatment

[0043] Weigh 100 kg of corn cobs (on an absolute dry basis), the content of pentosan in the corn cobs is 38%, and the moisture content of the air-dried mass of the corn cobs is 10%, and the corn cobs are crushed into 5-10 mm particle;

[0044] (2) Mixing

[0045] The acetyl group content in corn cob is 1.2% (the weight of acetyl group accounts for the percentage of the weight of corn cob), and the acetyl group of corn cob is converted into acetic acid during the steam explosion process, so it is equivalent to 1.2% acid in the raw material, adding 50 kg of 60 ° C Water and 1.8 kg of concentrated sulfuric acid with a mass fraction of 98% and corncobs were mixed evenly in a mixer, and the water at 60 °C came from the waste steam condensed and recovered during the steam explosion process;

[0046] (3) Separation of hemicellulose componen...

Embodiment 2

[0064] A method for producing furfural by lignocellulose biorefining, comprising the following steps:

[0065] (1) Raw material pretreatment

[0066] Weigh 100 kg of crop stalks-corn stalks (on a dry basis), the corn stalks have a pentosan content of 22%, and the corn stalks have an air-dried moisture content of 6%, and use a hammer crusher to crush the corn stalks into filaments;

[0067] (2) Mixing

[0068] The acetyl content of corn stalks is 2.0% (the weight of acetyl groups accounts for the percentage of the weight of corn stalks), and the acetyl groups of corn stalks are converted into acetic acid during the steam explosion process, so it is equivalent to 2.0% acid in the raw material. Water and 0.7kg of concentrated sulfuric acid with a mass fraction of 98% and corn stalks were evenly mixed in a mixer, and the water at 60°C came from the waste steam condensed and recovered during the steam explosion process;

[0069] (3) Separation of hemicellulose components

[0070...

Embodiment 3

[0087] A method for producing furfural by lignocellulose biorefining, comprising the following steps:

[0088] (1) Raw material pretreatment

[0089] Weigh 100 kg of bagasse (in terms of absolute dryness), the content of bagasse pentosan is 27%, and the moisture content of bagasse air-dried mass is 12%, because bagasse is a by-product of the sugarcane sugar industry, during the sugar making process has been crushed, no further fragmentation is required;

[0090] (2) Mixing

[0091] The acetyl content of bagasse is 1.7% (the weight of acetyl group accounts for the percentage of corn stalk weight), and the acetyl group of bagasse is converted into acetic acid during the steam explosion process, so it is equivalent to 1.7% acid in the raw material, adding 52 kg of 60℃ Water and 0.9 kg of concentrated sulfuric acid with a mass fraction of 98% and bagasse were mixed evenly in a mixer, and the water at 60 °C came from the waste steam condensed and recovered during the steam explos...

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Abstract

The invention discloses a method for producing furfural through lignocellulose bio-refinery. The method comprises the following steps of smashing a lignocelluloses raw material, and then uniformly mixing the smashed lignocellulose raw material with a certain amount of water and acid; separating hemicellulose components from other components in a high-temperature acid environment; utilizing water to extract hemicellulose; clarifying, concentrating and purifying a hemicellulose solution obtained through solid-liquid separation, and dehydrating and cyclizing in a furfural continuous reactor to generate furfural; distilling and rectifying to obtain a furfural product meeting national standards finally. According to the method for producing the furfural through lignocellulose bio-refinery provided by the invention, bio-refinery and a furfural two-step process are combined, pentosane is used for producing the furfural, and the other components play maximum functions according to the characteristics so as to be transformed into other bio-based products. According to the method for producing the furfural through lignocellulose bio-refinery, provided by the invention, various advanced technologies are integrated, so that the continuous and stable operation of the production process is ensured, the cleaner production, the energy conservation and the emission reduction of the production process are realized, the production cost is favorably reduced, and the comprehensive benefit of a project is improved.

Description

technical field [0001] The invention relates to the technical field of furfural production, in particular to a method for producing furfural by biorefinery of lignocellulose. Background technique [0002] Furfural, also known as furan formaldehyde, is an organic chemical raw material, mostly used to produce furfuryl alcohol, and 80% to 90% of furfuryl alcohol is used to produce furan resin. Furan resins are mainly used as foundry adhesives, casting mastics, cores and molds. A certain amount of furan resin is also added to glass fiber reinforced plastics, silicon filled plastics and anti-corrosion mortars. A small amount of furfuryl alcohol is used to produce high temperature resistant phenolic resin adhesives for friction wheels, such as brake pads for automobiles, etc. Furfuryl alcohol can also be used as an intermediate for the production of spices, fragrances, medicines, and pesticides. Tetrahydrofurfuryl alcohol, another downstream product of furfural, is mainly used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 戴伟平王宁
Owner 广西中基信汇科技有限公司
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