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Method for producing aromatic carboxylic acid

A kind of technology of aromatic carboxylic acid and aromatic compound, applied in the field of preparation of aromatic carboxylic acid

Active Publication Date: 2008-07-16
MITSUBISHI RAYON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Also, after the solvent recovery step partially condenses the distilled vapor by distillation and recovers methyl acetate from the vapor with methyl acetate, the waste gas mainly containing inert gas at this time still contains methyl acetate, which is The problem of making efficient use of this has not been resolved

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  • Method for producing aromatic carboxylic acid

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Embodiment Construction

[0026] Hereinafter, the present invention will be described in detail.

[0027] Examples of alkylaromatic compounds used in the present invention include alkylbenzenes and alkylnaphthalenes, such as monoalkane Benzene, dialkylbenzene or trialkylbenzene, also includes alkylbenzene and alkylnaphthalene whose alkyl group has been oxidized.

[0028] In addition, the method for preparing aromatic carboxylic acid adopted in the present invention typically includes the following steps:

[0029] (i) an oxidation reaction step for subjecting an alkylaromatic compound to a liquid-phase oxidation reaction in the presence of a catalyst containing cobalt, manganese and bromine in an acetic acid solvent to form a slurry containing an aromatic carboxylic acid;

[0030] (ii) a crystallization step for crystallizing the aromatic carboxylic acid dissolved in the mother liquor of the resulting slurry;

[0031] (iii) a solid-liquid separation step for solid-liquid separation of the aromatic car...

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Abstract

The inventive subject is to provide a method for producing advantageously an aromatic carboxylic acid such as terephthalic acid, in which an amount of an acetic acid solvent to be consumed in a process of producing an aromatic carboxylic acid is reduced as possible and thus a production efficiency is increased industrially. The invention provides a method for producing an aromatic carboxylic acid comprising subjecting an alkyl aromatic compound to an oxidation reaction in a liquid phase using acetic acid as a solvent to give a slurry containing an aromatic carboxylic acid, methyl acetate contained in an exhaust gas generated in a process after the oxidation reaction process, namely one or more processes selected from a crystallization process, a solid-liquid separation process, a drying process and a solvent recovery process, is separated and recovered and thus recovered methyl acetate is fed back to the oxidation reaction process.

Description

technical field [0001] The present invention relates to the preparation method of aromatic carboxylic acid. Specifically, the present invention relates to a method for producing aromatic carboxylic acids using acetic acid or the like as a solvent in the production. Background technique [0002] Generally, as a method for industrially producing aromatic carboxylic acids such as terephthalic acid, a known method comprises the step of making, for example, p-xylene with molecular oxygen in the presence of a catalyst containing cobalt, manganese, and bromine in an acetic acid solvent. Alkyl aromatic hydrocarbons are subjected to a liquid-phase oxidation reaction, and the slurry containing the resulting terephthalic acid or other aromatic carboxylic acid crystals is subjected to solid-liquid separation treatment, followed by a drying step to obtain crude aromatic carboxylic acids, and then the obtained The crude aromatic carboxylic acid is dissolved in water, and the aqueous solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/265C07C63/26C07C51/42
CPCC07C51/265C07C63/26
Inventor 沼田元幹福井胜彦绪方知彦
Owner MITSUBISHI RAYON CO LTD
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