公开(公告)号：EP1883623B1

公开(公告)日：2011-04-20

申请号：EP06754975.8

申请日：2006-05-03

Applicant: BASF SE

Inventor： OFTRING, Alfred ,  JUDAT, Bernd ,  RAULS, Matthias ,  FRIESE, Katrin

IPC: C07C253/34 ,  C07C255/24 ,  C07C255/25

CPC classification number: C07C253/34 ,  C07C255/24 ,  C07C255/25

Abstract: The invention relates to a method for isolating methyl glycine nitrile-N,N-diacetonitriles (MGDN) from an MGDN-containing aqueous emulsion with an MGDN content of 3 - 50% by weight in a crystallizer. The inventive method is characterized by (a) cooling the aqueous emulsion, starting from a temperature above the solidification point, to a temperature below the solidification point, the cooling rate in the temporal mean not exceeding 5 K/h, until substantially the total amount of the emulsified MGDN has solidified; and (b) continuing to cool the aqueous suspension obtained and/or concentrating it, the cooling rate being higher than that in step (a).

Abstract translation: 本发明涉及在结晶器中从MGDN含量为3-50重量％的含MGDN的含水乳液中分离甲基甘氨酸腈-N，N-二乙腈（MGDN）的方法。 本发明的方法的特征在于（a）从高于凝固点的温度开始将水性乳液冷却至低于凝固点的温度，冷却速率的时间平均值不超过5K / h，直到基本上达到总量 的乳化MGDN固化; 和（b）继续冷却所得到的含水悬浮液和/或浓缩它，冷却速率高于步骤（a）中的冷却速率。

公开(公告)号：EP1819662B1

公开(公告)日：2008-03-26

申请号：EP05817984.7

申请日：2005-11-29

Applicant: BASF SE

Inventor： JUDAT, Bernd ,  RAULS, Matthias ,  RÜBENACKER, Martin ,  WINTER, Manfred

IPC: C07C233/03 ,  C07C231/24

CPC classification number: C07C231/24 ,  C07C209/84 ,  C07C233/09 ,  C07C211/03

Abstract: Disclosed is a method for purifying an open-chain N-vinyl compound by means of a crystallization process in a crystallizer in which crystallization is performed from a melt of a mixture containing an open-chain N-vinyl compound at a pressure ranging from 10-3 to 400 bar.