Process for the production of a high purity terephthalic acid

Details Process for the production of a high purity terephthalic acid Process for the production of a high purity terephthalic acid

1978-05-19

1980-10-28

Siegel, A.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5133

Patent

active

042308828

ABSTRACT:
An improved process for the production of a high purity terephthalic acid by a liquid phase oxidation reaction of para-xylene by means of molecular oxygen or a molecular oxygen-containing gas in an aliphatic monocarboxylic acid solvent in the presence of a cobalt-manganese-bromine catalyst system, characterized in that as the cobalt-manganese-bromine catalyst system there is used a catalyst system of a specific composition at a specific concentration, and the liquid phase oxidation reaction is effected in the presence of acetaldehyde in addition to the cobalt-manganese-bromine catalyst system under relatively mild temperature (170.degree.-190.degree. C.) and pressure conditions while maintaining the water concentration in the reaction system at a specified low level. The terephthalic acid produced according to the process of the present invention is of so high a quality that it can be used for the direct production of a polyalkylene terephthalate from the acid and an alkylene glycol or ethylene oxide, which direct production does not need the preparation of an intermediate such as a methyl ester of terephthalic acid.

REFERENCES:
patent: 3240803 (1966-03-01), Thompson
patent: 3361803 (1968-01-01), Augustynowicz
patent: 3970696 (1976-07-01), Shigeyasu

Affiliated with

Also associated with

Rating

Process for the production of a high purity terephthalic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of a high purity terephthalic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of a high purity terephthalic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-269409