Process for making terephthalic acid

Details Process for making terephthalic acid Process for making terephthalic acid

1976-10-18

1978-04-25

Myers, Jane S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5108, C07C 6326

Patent

active

040862704

ABSTRACT:
A process for making terephthalic acid of high purity by feeding an aqueous equilibrium hydrolysis solution of terephthalonitrile to a reactive distillation column operated at a temperature of from about 200.degree. C to about 260.degree. C at autogenous pressure where the equilibrium solution is subjected simultaneously to further hydrolysis and distillation of ammonia while maintaining the concentration of aromatic materials in the aqueous liquid in said column sufficiently high to effect precipitation of dissolved terephthalic acid, removing the water vapor and ammonia from the top of the column, subjecting bottoms product in said column to further hydrolysis and distillation in a reboiler, returning vapor from the reboiler to the distillation column, removing an aqueous slurry of terephthalic acid from the reboiler and separating terephthalic acid product.

REFERENCES:
patent: 3873610 (1975-03-01), Norton
patent: 4034005 (1977-07-01), Hancock et al.

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