Production of fiber-grade terephthalic acid

Details Production of fiber-grade terephthalic acid Production of fiber-grade terephthalic acid

1975-05-02

1977-10-11

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5142

Patent

active

040535061

ABSTRACT:
Terephthalic acid (TA) or isophthalic acid (IA) of fiber-grade quality is recovered under oxidation temperature and pressure conditions from fluid oxidation effluent from catalytic liquid phase oxidation of the respective xylene isomer in acetic acid with molecular oxygen by crystal size classification and acetic acid mother liquor displacement with hot, fresh acetic acid followed by quenching the new suspension of phthalic acid crystals in said hot solvent with colder fresh acetic acid solvent and separating the product crystals. Such technique eliminates the need for separately purifying crude TA or IA or converting TA or IA to the respective dimethyl ester and purifying the ester.

REFERENCES:
patent: 3210416 (1965-10-01), Fragen et al.
patent: 3683018 (1972-08-01), Longland
patent: 3853924 (1974-12-01), Meyer et al.

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