Process for recrystalizing 1,3-diamino-phenoxy benzene

Application Number: 00102835
Application Date: 2000.01.13
Publication Number: 1269354
Publication Date: 2000.10.11
Priority Information: 1999/1/14 US 09/231039
International: C07C209/82;C07C217/90
Applicant(s) Name: National Starch and Chemical Investment Holding Corp.
Inventor(s) Name: L. J. Skeyi
Patent Agency Code: 72001
Patent Agent: zhong shouqi
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.