Process for crystallizing adduct of bisphenol a with phenol

Details Process for crystallizing adduct of bisphenol a with phenol Process for crystallizing adduct of bisphenol a with phenol

C - Chemistry, Metallurgy

07

C

260/623.7

C07C 37/84 (2006.01) C07C 39/16 (2006.01)

Patent

CA 1291171

27979-7 ABSTRACT OF THE DISCLOSURE A process for crystallizing the adduct of bisphenol A with phenol from a phenol solution in the presence of water comprises controlling the concentration of bisphenol A in said solution by removing part of phenol from said solution or adding phenol to said solution according to feedback control based on the measurement of solution density to obtain an adjusted solution, and feeding the adjusted solution to the crystallizer in which its inside wall is kept at a temperature higher than that of the adjusted solution, provided the temperature difference being smaller than 5°C. The crystallized adduct has a uniform particle size and a high purity.

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