Invention Grant
- Patent Title: Method of dehydrating tolylenediamine and dehydrator
- Patent Title (中): 甲苯二胺脱水方法
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Application No.: US12744670Application Date: 2008-11-25
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Publication No.: US08524047B2Publication Date: 2013-09-03
- Inventor: Toshiyuki Ogawa , Mitsunaga Dohzaki , Masaaki Sasaki
- Applicant: Toshiyuki Ogawa , Mitsunaga Dohzaki , Masaaki Sasaki
- Applicant Address: JP Tokyo
- Assignee: Mitsui Chemicals Inc.
- Current Assignee: Mitsui Chemicals Inc.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP2007-306093 20071127
- International Application: PCT/JP2008/071325 WO 20081125
- International Announcement: WO2009/069584 WO 20090604
- Main IPC: C07C53/08
- IPC: C07C53/08
Abstract:
A method of dehydrating tolylenediamine which includes subjecting tolylenediamine having a water content of 5-40 wt. % to first-stage distillation at a vacuum of 13-101.3 kPa and subjecting the bottoms from the first-stage distillation to second-stage distillation at a vacuum lower than 13kPa.
Public/Granted literature
- US20100243423A1 METHOD OF DEHYDRATING TOLYENEDIAMINE AND DEHYDRATOR Public/Granted day:2010-09-30
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