Invention Grant
US08759585B2 Two-stage process for cost-effective deposition of homogeneous catalysts in MDA synthesis
有权
在MDA合成中成本有效地沉积均相催化剂的两阶段方法
- Patent Title: Two-stage process for cost-effective deposition of homogeneous catalysts in MDA synthesis
- Patent Title (中): 在MDA合成中成本有效地沉积均相催化剂的两阶段方法
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Application No.: US13510680Application Date: 2010-12-13
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Publication No.: US08759585B2Publication Date: 2014-06-24
- Inventor: Markus Siegert , Torsten Mattke , Tilmann Steinmetz , Hans-Juergen Pallasch , Filip Nevejans
- Applicant: Markus Siegert , Torsten Mattke , Tilmann Steinmetz , Hans-Juergen Pallasch , Filip Nevejans
- Applicant Address: DE Ludwigshafen
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: EP09179900 20091218
- International Application: PCT/EP2010/069526 WO 20101213
- International Announcement: WO2011/080059 WO 20110707
- Main IPC: C07C211/00
- IPC: C07C211/00

Abstract:
The invention provides a process for preparing diphenylmethanediamine, comprising the steps of: a) reacting aniline with formaldehyde in the presence of an acid, b) neutralizing the predominant part of the acid with ammonia and/or aqueous ammonia solution, c) separating the reaction mixture from step b) into an aqueous phase and an organic phase, d) neutralizing the other part of the acid, present in the organic phase, with aqueous alkali metal hydroxide solution, e) separating the reaction mixture from step d) into an aqueous phase and an organic phase, f) treating the aqueous phase obtained in step c) or optionally the combined aqueous phases from steps c) and e) with at least one oxide or hydroxide of an alkaline earth metal, g) removing the ammonia obtained in step f).
Public/Granted literature
- US20120232307A1 TWO-STAGE PROCESS FOR COST-EFECTIVE DEPOSITION OF HOMOGENEOUS CATALYSTS IN MDA SYNTHESIS Public/Granted day:2012-09-13
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