Crystallization method

Details Crystallization method Crystallization method

1997-09-16

1999-03-09

McKane, Joseph K.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5482624, 5482636, 5483195, 5483684, C07D48704

Patent

active

058802894

ABSTRACT:
Disclosed is a method of crystallizing coupler crystals, the method comprising the steps of dissolving crude crystals of a coupler in a first solvent having a first solubility parameter to obtain a coupler solution; and adding to the solution a second solvent having a second solubility parameter different from the first solubility parameter, when the crystallization rate in the solution is 5 to 30 weight % of crystals having a BET value of 10 m.sup.2 /g or less.

REFERENCES:
patent: 4309501 (1982-01-01), Huguenard et al.

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