Process for preventing blackening of phthalic acid

Details Process for preventing blackening of phthalic acid Process for preventing blackening of phthalic acid

C - Chemistry, Metallurgy

07

C

260/511

C07C 63/26 (2006.01) C07C 51/265 (2006.01)

Patent

CA 1049552

PROCESS FOR PREVENTING BLACKENING OF PHTHALIC ACID ABSTRACT OF THE DISCLOSURE In the production of phthalic acid by oxidiz- ing, in a liquid phase, tolualdehyde with molecular oxygen or a gas containing molecular oxygen in the presence of heavy metal salt containing a Mn salt, especially both Mn and Co salts, and a bromine compound, using a lower aliphatic monocarboxylic acid as a reac- tion solvent, blackening of phthalic acid is effective- ly prevented by conducting the oxidation of tolualdehyde in the presence of an alkylbenzene in an amount satisfy- ing the following formula (1); M ? -0.15A2 + 15A + 40 ............. (1) wherein M is the Mn atom concentration in ppm by weight on the basis of the reaction solution, and A is the amount in % by weight of the alkylbenzene added on the basis of the total of tolualdehyde and said alkylbenzene, and is in a range of from more than 0 to 50 inclusive.

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