Apparatus for the esterification of terephthalic acid in the gas

Details Apparatus for the esterification of terephthalic acid in the gas Apparatus for the esterification of terephthalic acid in the gas

1976-04-21

1977-04-05

Scovronek, Joseph

Chemistry: physical processes

Physical processes

Crystallization

23279, B01J 804, C07C 6976

Patent

active

040159434

ABSTRACT:
Dimethyl terephthalate is prepared by the continuous esterification of terephthalic acid in the gas phase by evaporating solid terephthalic acid in a pre-reactor by means of a hot methanol vapor stream, conducting the gas mixture through a solid bed catalyst in a follow-up reactor, and recirculating a portion of the reaction product to the pre-reactor. After the pre-reactor the terephthalic acid dispersed in the methanol gas phase is heated and vaporized in one or more consecutive heat exchangers followed by one or more dwell period lengths and immediately heated to the esterification temperature prior to entry into the follow-up reactor.

REFERENCES:
patent: 3072465 (1963-01-01), Benichou et al.
patent: 3227743 (1966-01-01), Shaw et al.
patent: 3364251 (1968-01-01), Benning et al.
patent: 3377376 (1968-04-01), Gainer et al.
patent: 3617226 (1971-11-01), List et al.
patent: 3676485 (1972-07-01), Lewis et al.
patent: 3844934 (1974-10-01), Bomacci et al.

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