Invention Grant
US07524405B2 Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent
有权
从由异氰酸酯合成得到的反应混合物中分离出溶剂并纯化该溶剂的方法
- Patent Title: Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent
- Patent Title (中): 从由异氰酸酯合成得到的反应混合物中分离出溶剂并纯化该溶剂的方法
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Application No.: US10539610Application Date: 2003-12-13
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Publication No.: US07524405B2Publication Date: 2009-04-28
- Inventor: Martin Sohn , Eckhard Stroefer , Filip Nevejans , Ulrich Penzel , Hans-Juergen Pallasch , Peter Van Den Abeel , Filip Deberdt , Jan D. Jacobs , Wolfgang Mackenroth
- Applicant: Martin Sohn , Eckhard Stroefer , Filip Nevejans , Ulrich Penzel , Hans-Juergen Pallasch , Peter Van Den Abeel , Filip Deberdt , Jan D. Jacobs , Wolfgang Mackenroth
- Applicant Address: DE Ludwigshafen
- Assignee: BASF Aktiengesellschaft
- Current Assignee: BASF Aktiengesellschaft
- Current Assignee Address: DE Ludwigshafen
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- Priority: DE10260027 20021219
- International Application: PCT/EP03/14187 WO 20031213
- International Announcement: WO2004/056761 WO 20040708
- Main IPC: B01D3/00
- IPC: B01D3/00 ; C07C263/20
Abstract:
The invention relates to a process for preparing isocyanates by reaction of amines with phosgene in the presence of inert organic solvents in a reactor and subsequent work-up of the reaction mixture leaving the reactor, wherein the solvent is separated off in a two-stage or multistage, preferably two-stage, distillation process in which the solvent is separated off at a pressure of 0.1-15 bar in a first apparatus and at 1-900 mbar in a second apparatus or further apparatuses, with the heat of condensation of the solvent vapor from the first apparatus being used for partial or complete vaporization of solvent in the second apparatus.
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