Process for the production of terephthalic acid

Details Process for the production of terephthalic acid Process for the production of terephthalic acid

1996-04-19

1998-12-22

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

562487, C07C 51215

Patent

active

RE0360082

ABSTRACT:
Terephthalic acid is produced by oxidation of para xylene, purified in an aqueous phase and recovered by precipitating a purified product from the aqueous phase, the aqueous phase mother liquor is then cooled or evaporated to produce a further less pure precipitate and a second mother liquor and the less pure precipitate is returned to the reaction medium and/or the water of the second mother liquor is used to dissolve the crude solid and/or the second mother liquor is treated to recover water which is used to wash the precipitate recovered from the aqueous solution. The process produces better yields of terephthalic acid, reduces the use of water and reduces problems in the disposal of polluted waste water.

REFERENCES:
patent: 2849483 (1958-08-01), Ham
patent: 3452088 (1969-06-01), Olsen et al.
patent: 3592847 (1971-07-01), Gallivan et al.
patent: 3646125 (1972-02-01), Berthoux et al.
patent: 4467111 (1984-08-01), Puskas et al.
patent: 4933492 (1990-06-01), Schroeder et al.
patent: 5166420 (1992-11-01), Shiraki et al.

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