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Recovery installation and method for acetic acid and catalyst in process of preparing 2.6 naphthalic carboxylic acid

A recovery method and technology of naphthalene dicarboxylic acid are applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, which can solve the problem of not being commercialized, and achieve the effect of convenient process

Active Publication Date: 2007-12-26
HYOSUNG CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Catalyst recovery methods include incineration, vacuum filtration, and electrochemical methods, but these are not commercialized yet.

Method used

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  • Recovery installation and method for acetic acid and catalyst in process of preparing 2.6 naphthalic carboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The catalyst and reactants with the composition ratio shown in Table 1 were put into a 300L titanium oxidation reactor, which included a cooler, a heater, a stirrer and a recirculating acetic acid drum.

[0038] Table 1

[0039] substance

input

Cobalt

6.21% by weight (wt%)

Manganese

1.58% by weight

Bromine

3.87% by weight

distilled water

25.0% by weight

Acetic acid

Appropriate amount

[0040] Adjust the reaction temperature to 200°C and the reaction pressure to 20kg / cm 2 After that, the stirrer was set at 700 rpm so that the injected reaction gas was properly dispersed. A reaction solution having a weight ratio of dimethylnaphthalene to acetic acid of 10% was fed together with the catalyst at a rate of 93 kg / hr to perform continuous reaction.

[0041]After the reaction, the mother liquor discharged after the crystallization process and the separation process is injected into the recovery devic...

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PUM

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Abstract

This invention provides apparatus and method for effectively recovering acetic acid and catalyst in 2,6-naphthalene dicarboxylic acid production. Acetic acid and catalyst exist in the mother liquor discharged in 2, 6-naphthalene dicarboxylic acid production process after oxidation, crystallization and solid-liquid separation. The method for producing 2, 6-naphthalene dicarboxylic acid comprises: oxidizing dimethyl naphthalene in the presence of oxygen and acetic acid solvent with a catalyst system composed of transition metal (Co, Mn) and bromine compound to obtain 2, 6-naphthalene dicarboxylic acid.

Description

technical field [0001] The present invention relates to an apparatus and method for efficiently recovering acetic acid and catalysts in the mother liquor discharged after the oxidation process, the crystallization process, and the solid-liquid separation process in the continuous process of manufacturing naphthalene dicarboxylic acid acetic acid and catalyst, when the above-mentioned naphthalene dicarboxylic acid is produced, in the presence of oxygen-containing gas and acetic acid solvent, dimethylnaphthalene is oxidized by utilizing a catalytic system prepared by using transition metals such as cobalt and manganese and bromine compounds reaction to produce naphthalene dicarboxylic acid. Background technique [0002] Generally, in order to recover the acetic acid and the catalyst used in the process, various separation processes can be employed. [0003] Generally, distillation is used as a method for recovering acetic acid in the acetic acid recovery step, but this method...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C53/08
Inventor 权益铉崔英教宋秉骏池钟喆
Owner HYOSUNG CHEM CORP
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