Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1989-06-29
1990-08-14
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
549245, 562414, 562416, 562485, 562486, C07C 51215
Patent
active
049489216
ABSTRACT:
A process for the oxidation of pseudocumene to TMLA is disclosed which comprises catalytic oxidation of pseudocumene with air in the presence of acetic acid in an oxidation zone in the liquid phase wherein the weight ratio of acetic acid to pseudocumene is in the range of about 0.5-0:1.0 and the catalyst comprises one or more heavy metal oxidation catalysts comprising zirconium, cobalt, and manganese to provide about 0.1 to about 0.4 weight percent total metals based on pseudocumene and a source of bromine. The addition of the bromine component is controlled to provide a total of about 0.10 to about 0.30 weight percent total bromine based on pseudocumene. The total weight ratio of bromine ions to total metals ions is about 0.5 to about 2.0. The zirconium content is about 1 to about 5% and the manganese content is about 14 to about 60% each by weight of the total metals. The reaction temperature is about 300.degree. F. to about 420.degree. F. The crude trimellitic anhydride is hydrolyzed with water or a mixture of a low molecular weight carboxylic acid and water. Alternatively, a trimellitic anhydride/dimethylformamide adduct is prepared and this adduct is hydrolyzed with a mixture of a low molecular weight carboxylic acid and water. Trimellitic acid is useful in the manufacture of polyesters and polyamide-imides.
REFERENCES:
patent: 2833816 (1958-05-01), Saffer et al.
patent: 3161658 (1964-12-01), Meyer
patent: 3491144 (1970-01-01), Ember et al.
patent: 4322549 (1982-03-01), Kuhlmann et al.
patent: 4398040 (1983-08-01), Suzuki et al.
patent: 4587355 (1986-05-01), Brown et al.
patent: 4764639 (1988-08-01), Schammel
patent: 4816601 (1989-03-01), Lowry et al.
Green Michael R.
Schammel Wayne P.
Amoco Corporation
Blumberg Gunar J.
Clarke Vera C.
Lone Werren B.
Magidson William H.
LandOfFree
Process for the production and recovery of trimellitic 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 and recovery of trimellitic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production and recovery of trimellitic acid will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-464202