[EN] INTEGRATED PROCESSES FOR THE PREPARATION OF POLYBENZIMIDAZOLE PRECURSORS<br/>[FR] PROCÉDÉS INTÉGRÉS POUR LA PRÉPARATION DE PRÉCURSEURS DE POLYBENZIMIDAZOLE
申请人:DU PONT
公开号:WO2011084785A3
公开(公告)日:2011-11-17
[EN] 2,4,5-TRIAMINOPHENOLS AND RELATED COMPOUNDS<br/>[FR] 2,4,5-TRIAMINOPHÉNOLS ET COMPOSÉS APPARENTÉS
申请人:DU PONT
公开号:WO2011084762A3
公开(公告)日:2011-10-06
[EN] 2,4,5-TRIAMINOPHENOLS AND RELATED COMPOUNDS<br/>[FR] 2,4,5-TRIAMINOPHÉNOLS ET COMPOSÉS ASSOCIÉS
申请人:DU PONT
公开号:WO2011084810A3
公开(公告)日:2011-10-13
INTEGRATED PROCESSES FOR THE PREPARATION OF POLYBENZIMIDAZOLE PRECURSORS
申请人:Dhawan Rajiv
公开号:US20130046109A1
公开(公告)日:2013-02-21
An integrated process is provided for efficiently preparing 2,4,5-triaminaphenol, starting with nitration of 2,6-dihalobenzene; high purity salts thereof; and complexes of 2,4,5-triaminophenol aromatic diacids, which are precursors for making polybenzimidazole polymer for high performance fibers. The process design eliminates several costly intermediate drying and recrystallization steps. The handling of solid materials with possible skin sensitizing properties and toxicity is avoided, thereby eliminating human and environmental exposure.