Process for the production of bishenol A

Details Process for the production of bishenol A Process for the production of bishenol A

1994-04-18

1995-01-17

Lone, Werren B.

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

Organic compounds

Oxygen containing

568724, 568749, C07C 3916, C07C 3768

Patent

active

053827112

ABSTRACT:
High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005 % by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.

REFERENCES:
patent: 3936507 (1976-02-01), Ligorati
patent: 4354046 (1982-10-01), Ladewig
patent: 4740634 (1988-04-01), Gomes de Matos et al.
patent: 4740635 (1988-04-01), Gomes de Matos et al.
patent: 4847433 (1989-07-01), Kissinger
patent: 4894486 (1990-01-01), Neil, Jr.
patent: 4927978 (1990-05-01), Buechele et al.
patent: 4942265 (1990-07-01), Iimuro et al.

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