Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1996-01-16
1997-12-02
Barts, Samuel
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5116
Patent
active
056938560
ABSTRACT:
Terephthalic acid is produced by reacting paraxylene with oxygen in a reactor having several vertical stages, the reaction taking place in the liquid phase using acetic acid as solvent and a cobalt-manganese-bromine complex catalyst. During the reaction, a carbon dioxide-containing gas phase is withdrawn from the vapor space of the reactor. The gas phase is cooled to condense vaporized acetic acid therefrom and carbon dioxide is separated from the gas phase and recycled to the vapor space or to the liquid phase or to both of these. In an alternate embodiment, the gas remaining after condensing acetic acid is subjected to catalytic oxidation to oxidize carbon monoxide and methane, if present, to carbon dioxide, and some or all of the carbon dioxide is recycled to the reactor.
REFERENCES:
patent: 4172209 (1979-10-01), Vora
patent: 4263448 (1981-04-01), Leacock
patent: 4593122 (1986-06-01), Hashizume et al.
Ramachandran Ramakrishnan
Sethna Rustam H.
Tamhankar Satish S.
Barts Samuel
Pace Salvatore P.
Reap Coleman R.
The BOC Group Inc.
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