Process for producing bisphenol A

Details Process for producing bisphenol A Process for producing bisphenol A

2006-05-16

2006-05-16

Price, Elvis O. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S716000, C568S717000, C568S723000

Reexamination Certificate

active

07045664

ABSTRACT:
In a process for producing bisphenol A, an adduct of bisphenol A with phenol is promptly recovered in highly purity and high efficiency from a reaction mother liquor in the case of singling out bisphenol A from a reaction product. An adduct layer of bisphenol A with phenol is formed by crystallizing an adduct of bisphenol A with phenol from a solution of bisphenol A in phenol to form a slurry, the bisphenol A being produced by reacting phenol and acetone in the presence of an acid catalyst, subjecting the resultant slurry to a solid-liquid separation treatment, and thereafter removing the phenol from solid components, characterized by pouring onto a filter, a slurry solution of bisphenol A in phenol, the slurry solution containing in a crystalline state, an adduct of bisphenol A having an average particle size in the range of 0.05 to 1 mm with phenol, and filtering the slurry solution under reduced pressure in an atmosphere of an inert gas stream at 30 to 80° C. containing oxygen in a concentration of at most 5,000 ppm by volume.

REFERENCES:
patent: 6686508 (2004-02-01), Hirano et al.
patent: 522700 (1993-01-01), None
patent: 5-331088 (1993-12-01), None
patent: 6-306002 (1994-11-01), None
patent: 11-090118 (1999-04-01), None

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