Process for continuous preparation of trimellitic anhydride by step catalytic oxidation process

A technology of trimellitic anhydride and catalytic oxidation, applied in the direction of organic chemistry, can solve problems such as uneven gas distribution and affecting product quality, and achieve the effects of reducing the concentration of impurities, reducing energy consumption, and improving yield
CN1594302AInactive Publication Date: 2005-03-16CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2005-03-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a process for continuous preparation of trimellitic anhydride by step catalytic oxidation process by using pseudocumene as raw material, fatty group carboxylic acid as dissolvent, cobalt, manganese and bromine as catalyst, the preparing process comprises the steps of, (1) stepwise continuous catalysis oxidizing process, (2) crystallization and liquid-solid separation, (3) anhydride forming procedure, (4) subtractive process, and (5) solvent reclamation.
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Description

technical field

[0001] The invention relates to a method for producing trimellitic anhydride by a continuous step-by-step oxidation process. The method uses trimethylbenzene as a raw material, lower aliphatic carboxylic acid (such as acetic acid) as a solvent, adopts a cobalt, manganese and bromine catalytic system, and performs liquid-phase oxidation reaction of the trimethylene with gas containing oxygen molecules. After a certain period of oxidation, trimellitic acid production is carried out by again carrying out the addition of catalyst. Compared with the original domestic batch production process, the continuous step-by-step oxidation production method makes the yield of the product reach 90 (mol)%. At the same time, the safety of the oxidation reaction system is improved, the product quality is stable, the service life of the equipment is extended, and it is easy to use in large-scale production. Large-scale industrial production. Background technique

[0002] Trime...

Claims

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