Process for recrystallizing 1,3-bis(aminophenoxy benzene)

Details Process for recrystallizing 1,3-bis(aminophenoxy benzene) Process for recrystallizing 1,3-bis(aminophenoxy benzene)

1999-01-14

1999-12-28

Killos, Paul J.

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

Organic compounds

Amino nitrogen containing

564430, 564437, C07C20900, C07C21300

Patent

active

060084138

ABSTRACT:
A process for purifying 1,3-bis(aminophenoxy benzene) (APB) on a manufacturing scale to at least 99.5% purity comprises the sequential steps of (a) forming the dihydrochloride salt of APB (hereinafter APB-HCl), (b) recrystallizing the APB-HCl from isopropyl alcohol, and (c) converting the APB-HCl to free APB.

REFERENCES:
patent: 4692554 (1987-09-01), Yamaguchi et al.
St. Clair, A. et al. Polym. Mater. Sci Eng. (1984) 51 62-6.

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