VERFAHREN ZUR ISOLIERUNG VON METHYLGLYCINNITRIL-N,N-DIACETONITRILEN AUS EINEM WÄSSRIGEN ROHGEMISCH
    39.
    发明授权
    VERFAHREN ZUR ISOLIERUNG VON METHYLGLYCINNITRIL-N,N-DIACETONITRILEN AUS EINEM WÄSSRIGEN ROHGEMISCH 有权
    VERFAHREN ZUR ISOLIERUNG VON METHYLGLYCINNITRIL-N,N-DIACETONITRILEN AUS EINEMWÄSSRIGENROHGEMISCH

    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

    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。

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