Process for the production of fiber-grade terephthalic acid

Details Process for the production of fiber-grade terephthalic acid Process for the production of fiber-grade terephthalic acid

1977-05-26

1979-06-19

Siegel, A.

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

Organic compounds

Carboxylic acids and salts thereof

562414, C07C 5142

Patent

active

041587383

ABSTRACT:
Process for the preparation of fiber-grade terephthalic acid by continuously oxidizing paraxylene while vaporizing a portion of the contents of the reactor. Fiber-grade terephthalic acid is produced by maintaining (1) a temperature of at least 210.degree. C., (2) a molecular oxygen content of the noncondensables in the vapor withdrawn from the reactor in the range 3.0-6.0%, (3) a water level of the contents of the oxidizer in the range 5.0-17.0%, (4) a mole ratio of sodium to cobalt plus manganese in the range 0.06-2.0 in the reactor, (5) a mole ratio of cobalt to manganese in the range 0.5-5.0 (6) an organic burn in the range 8.0-15.0 burn units and (7) a productivity in the range 0.45-1.45 pounds of terephthalic acid per minute per 100 pounds of reactor contents.

REFERENCES:
patent: 2890245 (1959-06-01), Bonnet
patent: 3089906 (1963-05-01), Saffer
patent: 3092658 (1963-06-01), Baldwin
patent: 3920735 (1975-11-01), Wampfler

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