Process for the production of crystalline adduct of bisphenol A

Details Process for the production of crystalline adduct of bisphenol A Process for the production of crystalline adduct of bisphenol A

1993-03-03

1994-09-06

Lone, Werren B.

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

Organic compounds

Oxygen containing

568723, 568724, 568727, 568729, C07C 3916

Patent

active

053450000

ABSTRACT:
High purity, crystalline adduct of bisphenol A and phenol is produced multi-stage crystallization of a phenolic slurry of bisphenol A with a crystal separation and washing step being interposed between each of the two stages. Each of the crystallization stage includes a series of crystallization towers operated at decreasing temperatures. The crystallization of the slurry is performed by continuously discharging a portion of the slurry from each of the crystallization towers, introducing the discharged slurry into one or more coolers and then recycling the cooled slurry to the tower. Another portion of the slurry in each crystallization slurry is continuously discharged, heated for dissolving fine crystals of the adduct and then recycled to the crystallization tower so that large crystals are grown in each of the crystallization steps. An apparatus having a plurality of coolers and suitable for effecting the above crystallization is also disclosed.

REFERENCES:
patent: 4209646 (1980-06-01), Gac et al.
patent: 4950805 (1990-08-01), Iimuro et al.
patent: 4950806 (1990-08-01), Iimuro et al.
patent: 4954661 (1990-09-01), Iimuro et al.
CEP, May 1986, "Industrial Crystallization For Ultrapure Products".
European Search Report dated Sep. 16, 1993.

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