Process and apparatus for producing aromatic dicarboxylic acids

Details Process and apparatus for producing aromatic dicarboxylic acids Process and apparatus for producing aromatic dicarboxylic acids

1980-07-23

1982-04-27

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562412, 562421, 562422, C07C 5116

Patent

active

043272266

ABSTRACT:
A process and an apparatus for producing an aromatic dicarboxylic acid by oxidizing a benzene derivative with molecular oxygen in the liquid phase in a lower aliphatic carboxylic acid as a solvent in the presence of an oxidation catalyst, wherein a starting material liquid e.g., a benzene derivative or a solution thereof in the lower aliphatic carboxylic acid, is fed into the liquid-phase reaction system in a uniformly dispersed state by being passed through a porous material causing the pressure of the starting material liquid just after passing through said porous material to drop more than about 1 kg/m.sup.2 in relation to the pressure of the starting material liquid just before passing through said porous material. The resultant aromatic dicarboxylic acid has high purity and has good color.

REFERENCES:
patent: 3093626 (1963-06-01), Cines
patent: 3407179 (1968-10-01), Carr
patent: 3677714 (1972-07-01), Ledgett
patent: 3721530 (1973-03-01), Bouchet
patent: 4062654 (1977-12-01), Shigeyasu

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