Process for crystallizing 2,2-bis...

Details Process for crystallizing 2,2-bis... Process for crystallizing 2,2-bis...

C - Chemistry, Metallurgy

07

C

260/640

C07C 43/174 (2006.01) C07C 43/225 (2006.01)

Patent

CA 1072125

ABSTRACT OF THE DISCLOS~RE Crystalline 2,2-bis[3,5-dibromo-4-(2-hydroxyethoxy)phenyl] propane is prepared by cooling the molten such product preferably with the applicatior of heat, to provide such product which is relatively free of impurities and consists predominantly of the diethoxylated product e.g. 85 wt % and preferab] 93 wt % or more dethoxylate and less than 1 wt % solvent and water impuritie~ and preferably 0.5 % by weight solvent and water impurities. This provides a commercially acceptable process for rapidly and economically crystallizing the product. An especially useful aspect of this invention involves the con- tinuous crystallization of such 2,2-bis(3,5-dibromo-4-(2-hydroxyethoxy)phenyl propane product employing a scraped surface heat exchanger to achieve the de- sired rate of cooling and shear.

248667

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