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Method for preparing crotonic acid

A technology of crotonic acid and crotonaldehyde, which is applied in the field of crotonic acid preparation, can solve the problems of long reaction time, low product yield, and non-recyclable catalyst, and achieve the effect of shortening oxidation time and reducing cost

Inactive Publication Date: 2003-05-07
JIANGSU PANOXI CHEM
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the oxidation of crotonaldehyde to produce crotonic acid usually makes crotonaldehyde oxidized to crotonic acid through the catalyst acetate in the oxidation tower, but the catalyst cannot be recycled, the reaction time is long, and the product yield is relatively low.

Method used

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Embodiment Construction

[0007] Metal silver powder catalyst is added in the oxidation tower by weight ratio silver powder: silver powder of crotonaldehyde = 1-3: 1000, the temperature of crotonaldehyde is raised, when rising to 30-40 DEG C, in the oxidation tower, continuously pass into about 6 hours air, The temperature of the oxidation tower is controlled at 15-130°C, the catalyst initiation temperature is 20°C; the pressure inside the tower is controlled at 0.1-5mpa, the reflux temperature is controlled below 50°C, the oxidation reflux temperature is adjusted with the flow of cooling water, and the valve is closed when the reaction is normal. , and then pass cooling water to maintain the temperature inside the tower. When the acid value of the material is 35-37%, the oxidation work is completed. For the purification of crotonic acid, the crude product of crotonic acid is sent to a crude steamer for crude evaporation to remove crotonaldehyde, and then sent to a distillation tower to distill 99% of ...

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Abstract

A process for preparing crotonic acid features that under the catalysis of silver powder as catalyst, the crotonaldehyde is oxidized in oxidizing tower to obtain crotonic acid. Its advantages are high output rate and short reaction time.

Description

technical field [0001] The invention relates to a method for preparing crotonic acid by oxidizing crotonaldehyde. Background technique [0002] At present, crotonaldehyde is oxidized to produce crotonic acid by oxidizing crotonaldehyde to crotonic acid through the catalyst acetate in the oxidation tower, but the catalyst cannot be recycled, the reaction time is long, and the product yield is relatively low. Contents of the invention [0003] In order to increase the yield of crotonic acid, shorten the reaction time, and further reduce the cost, the invention provides a method for preparing crotonic acid using metallic silver powder as a catalyst. [0004] The present invention uses crotonaldehyde as raw material and metal silver powder as a catalyst to oxidize crotonaldehyde into crotonic acid in an oxidation tower under the catalysis of metal silver powder in the ratio of silver powder: crotonaldehyde = 1-3: 1000. [0005] During oxidation in the present invention, the t...

Claims

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Application Information

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IPC IPC(8): C07C51/16C07C57/08
Inventor 薛峰
Owner JIANGSU PANOXI CHEM
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