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Method for preparing maleic anhydride from furfural by utilizing catalytic oxidation method

A technology for catalytic oxidation and furfural, which is applied in chemical instruments and methods, catalytic reactions, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, high reaction temperature, and increased energy input, so as to realize recycling and reduce Cost of preparation, effect of avoiding cooling energy consumption

Inactive Publication Date: 2017-12-15
ANHUI ZHIBO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the furfural conversion rate and maleic anhydride yield of this patent have been greatly improved compared with the prior art, the reaction temperature is as high as above 300°C, the energy consumption is high, and the boiling point of maleic anhydride is 202.2°C, so the maleic anhydride generated by the reaction is The gaseous state needs to be cooled after the reaction can be converted into a liquid state, which further increases the energy consumption input

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 10mol furfural in methanol to make a furfural methanol solution with a mass concentration of 15%, and then pass through a fixed-bed reactor filled with a loaded metal catalyst together with air to make furfural undergo catalytic oxidation reaction. The reaction temperature is 130-135 °C and the pressure is 0.07MPa, after the reaction, the resulting mixture was concentrated under reduced pressure to recover methanol, and the residue was maleic anhydride. The conversion rate of furfural was 99.5%, and the yield of maleic anhydride was 97.4%.

[0025] Among them, every 1mol of furfural consumes 30mol of air, and the liquid volume space velocity of furfural is 50h -1 .

[0026] Preparation of supported metal catalyst: Add deionized water dropwise to 3mol chromium trichloride hexahydrate and 0.5mol copper chloride dihydrate under stirring until completely dissolved to prepare a solution, and add 0.1mol polyglutamine to the solution Acid / N-methylolacrylamide, after...

Embodiment 2

[0029] Dissolve 10mol furfural in methanol to make a furfural methanol solution with a mass concentration of 20%, and then pass through a fixed-bed reactor filled with a loaded metal catalyst together with air to make furfural undergo catalytic oxidation reaction. The reaction temperature is 130-135°C and the pressure is 0.05MPa, after the reaction, the resulting mixture was concentrated under reduced pressure to recover methanol, and the residue was maleic anhydride. The conversion rate of furfural was 99.8%, and the yield of maleic anhydride was 98.2%.

[0030] Among them, every 1mol of furfural consumes 30mol of air, and the liquid volume space velocity of furfural is 40h -1 .

[0031] Preparation of supported metal catalyst: Add deionized water dropwise to 5mol chromium trichloride hexahydrate and 1mol copper chloride dihydrate under stirring until completely dissolved to prepare a solution, and add 0.2mol polyglutamic acid to the solution / N-Methylolacrylamide, after fu...

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Abstract

The invention discloses a method for preparing maleic anhydride from furfural by utilizing a catalytic oxidation method, which relates to the technical field of chemical synthesis. Furfural is dissolved as a material into methanol, so that furfural-methanol solution, the mass concentration of which is 15 to 20 percent, is prepared, the furfural-methanol solution then passes through a fixed bed reactor filled with supported metal catalyst along with air, so that the furfural carries out catalytic oxidation reaction, the reaction temperature is 130 DEG C to 135 DEG C, the pressure is 0.05MPa to 0.1MPa, the obtained mixture is concentrated by vacuum to recover the methanol after the reaction is complete, and residue is maleic anhydride. Since the supported metal catalyst is utilized by the method, the furfural transformation rate reaches 99 percent or more, the yield of the maleic anhydride reaches 97 percent or more, and therefore almost all the furfural takes part in reaction; and moreover, the purity of the prepared maleic anhydride is increased.

Description

Technical field: [0001] The invention relates to the technical field of chemical synthesis, in particular to a method for preparing maleic anhydride from furfural by using a catalytic oxidation method. Background technique: [0002] Maleic anhydride, referred to as maleic anhydride, also known as maleic anhydride, is an important organic chemical raw material and the third largest anhydride in the world after phthalic anhydride and acetic anhydride. It is widely used in petrochemical, food processing, and pharmaceutical industries. , Building materials and other industries. [0003] At present, the production process of maleic anhydride mainly adopts benzene oxidation method and n-butane oxidation method. Among them, the process of benzene oxidation is mature, and the conversion rate and selectivity of raw materials are good, but the pollution to the environment is more serious; compared with benzene oxidation, n-butane oxidation has the advantages of cheap raw materials an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60B01J31/34
CPCB01J31/06B01J31/34B01J2231/70C07D307/60
Inventor 汪六一宋从发
Owner ANHUI ZHIBO NEW MATERIAL TECH CO LTD