Process for the preparation of pure sodium hydroxide addition co

Details Process for the preparation of pure sodium hydroxide addition co Process for the preparation of pure sodium hydroxide addition co

1979-03-06

1980-01-01

Trousof, Natalie

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23520

Patent

active

041818059

ABSTRACT:
The pure sodium hydroxide addition products of the cis-isomers of naphthoylene-bis-benzimidazoles are recovered from their alkaline aqueous-alcoholic solution as obtained in their synthesis by eliminating the alcohol as far as feasible, reacting the remaining aqueous alkaline solution with chlorine or sodium hypochlorite solution at an elevated temperature, removing the insoluble by-products, introducing into the hot solution a compound yielding sodium ions and isolating the precipitating product or processing it further to yield the free naphthoylene-bis-benzimidazole pigments.

REFERENCES:
patent: 3072661 (1963-01-01), Pizzarello et al.
patent: 3641051 (1972-02-01), Frischkorn et al.

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