Process for production of bisphenol A

Details Process for production of bisphenol A Process for production of bisphenol A

2004-03-25

2009-10-06

Sullivan, Daniel M (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

07598424

ABSTRACT:
An object of present invention is to provide a process of producing bisphenol A, and more particularly a process of producing bisphenol A having high purity and an excellent hue.In the present invention, in a crystallization step to form the slurry containing adduct crystals,(a) a fed solution of bisphenol A in phenol is cooled at the temperatures of at least two steps to form a slurry containing adduct crystals,(b) at least two crystallization stages having different cooling temperatures are provided, and(c) when the solid fraction of the slurry is A [% by weight] in the final crystallization stage prior to transporting the slurry into the solid-liquid separation step and the solid fraction of the slurry is B [% by weight] in the crystallization stage in which crystals are first formed, the value of B/A is kept 0.7 or less.

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