Mixed solvent recovery of 4,4'-dihydroxybiphenyl

Details Mixed solvent recovery of 4,4'-dihydroxybiphenyl Mixed solvent recovery of 4,4'-dihydroxybiphenyl

1983-04-22

1984-12-25

Lone, Werren B.

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

Organic compounds

Oxygen containing

C07C 3702, C07C 3912

Patent

active

044905645

ABSTRACT:
A process for the preparation of 4,4'-dihydroxybiphenyl having high purity by hydrolyzing 4,4'-dibromobiphenyl in the presence of a hydrolysis catalyst in an alkaline aqueous solution, separating the catalyst from the alkaline aqueous solution, acidifying the alkaline aqueous solution with an acid to form crude solid 4,4'-dihydroxybiphenyl, separating the 4,4'-dihydroxybiphenyl, dissolving the 4,4'-dihydroxybiphenyl in an inert organic solvent which is preferably at an elevated temperature, adding water to the inert organic solvent mixture which allows the inorganic salt that may be present to remain in solution and the 4,4'-dihydroxybiphenyl begins to precipitate out of solution and recovering the precipitated solid 4,4'-dihydroxybiphenyl having high purity.

REFERENCES:
patent: 4340768 (1982-07-01), Jinbo

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