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Preparing method for furfural

A furfural, corncob technology, applied in the direction of organic chemistry and the like, can solve the problems of high production cost, increased production cost, and high reuse cost, and achieves the effects of easy handling and improved yield

Inactive Publication Date: 2019-04-19
王国锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production process of furfural using corncobs is: crushing corncobs, hydrolyzing in an acid mixer, distilling, neutralizing, and refining. It can be seen that the traditional preparation process is relatively complicated, and a large amount of acid is consumed in the process of acidolysis and hydrolysis. Not only the production cost Higher, and a large amount of waste acid and waste liquid will be generated in the production process
In addition, due to the addition of acid in the preparation process, the acidity of the solid waste is too high, the cost of reuse is high, and it becomes useless waste residue, causing environmental pollution and increasing production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) After the corn cob is soaked in methanol, the corn cob is finely crushed until the particle size is less than 300 mesh, and the solid-liquid separation is carried out after adding methanol and stirring and soaking. The mass ratio of corn cob to methanol is 1:2;

[0023] 2) Toluene and dilute sulfuric acid with a mass concentration of 5% are directly added to the liquid phase of solid-liquid separation, and the acid hydrolysis reaction is carried out for 6 hours under heating to 85°C with stirring; the mass ratio of dilute sulfuric acid and toluene to the corncob in step 1) is 35:26:10;

[0024] 3) The acid hydrolysis is completed, and after standing still, the water phase and the oil phase are separated. After the water phase is centrifuged and then filtered to separate the cellulose, it is distilled and separated to obtain methanol solution and dilute sulfuric acid, and the methanol solution is returned. Go to step 1) for repeated use, dilute sulfuric acid returns t...

Embodiment 2

[0026] 1) After the corn cob is soaked in methanol, the corn cob is finely pulverized until the particle size is less than 300 mesh, and methanol is added to stir and soak for solid-liquid separation. The mass ratio of corn cob to methanol is 1:3;

[0027] 2) Toluene and dilute sulfuric acid with a mass concentration of 6% are directly added to the liquid phase of solid-liquid separation, and the acid hydrolysis reaction is carried out under stirring conditions at 86°C for 7 hours; the mass ratio of dilute sulfuric acid and toluene to the corncob in step 1) is 30:30:10;

[0028] 3) The acid hydrolysis is completed, and after standing still, the water phase and the oil phase are separated. After the water phase is separated from the cellulose by membrane filtration, it is then distilled and separated into methanol solution and dilute sulfuric acid. The methanol solution returns to step 1. ) for repeated use, and the dilute sulfuric acid returns to step 2) for repeated use; afte...

Embodiment 3

[0030] 1) After the corn cob is soaked in methanol, the corn cob is finely crushed until the particle size is less than 300 mesh, and the solid-liquid separation is carried out after adding methanol and stirring and soaking. The mass ratio of corn cob to methanol is 1:2;

[0031] 2) Toluene and dilute sulfuric acid with a mass concentration of 4% are directly added to the liquid phase of solid-liquid separation, and the acid hydrolysis reaction is carried out under stirring conditions at 85°C for 6.5 hours; the dilute sulfuric acid and toluene are mixed with the mass of the corn cob in step 1) The ratio is 40:25:10;

[0032] 3) The acid hydrolysis is completed, and after standing still, the water phase and the oil phase are separated. After the water phase is separated by high-speed centrifugation to separate the cellulose, it is then distilled and separated to obtain methanol solution and dilute sulfuric acid. The methanol solution returns to step 1. ) for repeated use, and t...

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Abstract

The invention discloses a preparing method for furfural, and belongs to the technical field of biorefinery. The preparing method is characterized by including the steps that 1) corncobs are micro-smashed, methyl alcohol is added, and the mixture is stirred and soaked to be subjected to solid-liquid separation; 2) methylbenzene and dilute sulphuric acid with the mass concentration of 3% to 10% aredirectly added into a solid-liquid-separation liquid phase, and an acidolysis reaction is conducted under the stirring condition, wherein the mass ratio of the dilute sulphuric acid to methylbenzene to the corncobs in the step 1) is (20-50):(15-45):10; 3) acidolysis is completed, standing is conducted, then separation of the water phases and oil phases is conducted, and oil phases distill to recover methylbenzene, and the biorefinery is obtained. Solid in the preparing method is not subjected to acid treatment, residual methyl alcohol is easy to volatilize and treat, and follow-up using is notinfluenced. In the hydrolytic process, the generated furfural is continuously separated through methylbenzene, it is also promoted that hydrolysis normally runs, and the yield is greatly increased; the used methylbenzene can be distilled, recycled and reused.

Description

technical field [0001] A preparation method of furfural belongs to the technical field of biological refining. Background technique [0002] At present, the production process of furfural using corncobs is: crushing corncobs, hydrolyzing in an acid mixer, distilling, neutralizing, and refining. It can be seen that the traditional preparation process is relatively complicated, and a large amount of acid is consumed in the process of acidolysis and hydrolysis. Not only the production cost Higher, and a large amount of waste acid and waste liquid will be generated during the production process. In addition, due to the addition of acid in the preparation process, the acidity of the solid waste is too high, the cost of reuse is high, and it becomes useless waste residue, causing environmental pollution and increasing production costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art ...

Claims

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Application Information

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IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 王国锋
Owner 王国锋
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