Invention Grant
US07754911B2 Method for isolating methyl glycine nitrile-N,N-diacetonitriles from an aqueous crude mixture
有权
从粗水混合物中分离甲基甘氨酸腈-N，N-二乙腈的方法
- Patent Title: Method for isolating methyl glycine nitrile-N,N-diacetonitriles from an aqueous crude mixture
- Patent Title (中): 从粗水混合物中分离甲基甘氨酸腈-N，N-二乙腈的方法
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Application No.: US11913726Application Date: 2006-05-03
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Publication No.: US07754911B2Publication Date: 2010-07-13
- Inventor: Alfred Oftring , Bernd Judat , Matthias Rauls , Katrin Friese
- Applicant: Alfred Oftring , Bernd Judat , Matthias Rauls , Katrin Friese
- Applicant Address: DE Ludwigshafen
- Assignee: BASF Aktiengesellschaft
- Current Assignee: BASF Aktiengesellschaft
- Current Assignee Address: DE Ludwigshafen
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: DE102005021056 20050506
- International Application: PCT/EP2006/062008 WO 20060503
- International Announcement: WO2006/120144 WO 20061116
- Main IPC: C07C255/00
- IPC: C07C255/00
Abstract:
The invention relates to a process for isolating methylglycinenitrile-N,N-diacetonitrile (MGDN) from an aqueous emulsion which comprises MGDN and has an MGDN content of 3-50% by weight in a crystallizer, comprising the steps: (a) the aqueous emulsion is, starting from a temperature above the solidification point, cooled to a temperature below the solidification point, the cooling rate averaged over time not exceeding 5 K/h, until substantially the entirety of the emulsified MGDN has solidified, (b) the resulting aqueous suspension is cooled further and/or concentrated, and the cooling rate may be greater than in step (a).
Public/Granted literature
- US20080194858A1 Method for Isolating Methyl Glycine Nitrile-N,N-Diacetonitriles from an Aqueous Crude Mixture Public/Granted day:2008-08-14
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