Method of obtaining aromatic tri-or-tetracarboxylic acids

Details Method of obtaining aromatic tri-or-tetracarboxylic acids Method of obtaining aromatic tri-or-tetracarboxylic acids

1975-12-22

1976-11-23

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260465C, C07C 5142

Patent

active

039936902

ABSTRACT:
A method of obtaining aromatic tri- or tetracarboxylic acids characterized in that tri- or tetraalkylbenzenes or the derivatives thereof with a heteroatom in the side chain, are oxidized by oxygen or an oxygen-containing gas in the vapor phase in the presence of ammonia and water vapor at a molar ratio of the parent alkylbenzenes, oxygen or oxygen-containing gas, ammonia and water vapor equal to 1:2-100:5-40:30-100, respectively, on catalysts comprising vanadium oxides modified by the oxides of tin, titanium, bismuth or molybdenum at a molar ratio of vanadium oxides to the modifying oxides equal to 1:0.5-8 and a temperature of from 350.degree. to 440.degree. C, whereupon the resulting nitriles, imides, cyanimides or the mixtures thereof are subjected to acid or alkaline hydrolysis by 2-10 per cent aqueous solutions of acids or alkalis at a temperature of from 60.degree. to 100.degree. C.
Aromatic tri- or tetracarboxylic acids obtained by the herein-disclosed technique feature a high degree of purity and are applicable as intermediate products of organic synthesis, in particular, as parent substances for polymeric materials.

REFERENCES:
patent: 2499055 (1950-02-01), Cosby et al.
patent: 3393220 (1968-07-01), Winnick et al.

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