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    Process for preparing alpha-hydroxycarboxylic esters
    4.
    发明授权
    Process for preparing alpha-hydroxycarboxylic esters 失效
    制备α-羟基羧酸酯的方法

    公开(公告)号：US08569539B2

    公开(公告)日：2013-10-29

    申请号：US12298034

    申请日：2007-03-28

    申请人： Alexander May ,  Bernd Vogel ,  Hermann Siegert ,  Jochen Ackermann ,  Soenke Broecker

    发明人： Alexander May ,  Bernd Vogel ,  Hermann Siegert ,  Jochen Ackermann ,  Soenke Broecker

    IPC分类号： C07C67/20

    CPC分类号： C07C67/20 ,  C07C67/54 ,  C07C69/675

    摘要： Alpha-hydroxycarboxylic esters are prepared by a continuous process in which alpha-hydroxycarboxamide is reacted with an alcohol in the presence of a catalyst to obtain a product mixture which contains alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide and alcohol, and catalyst; wherein reactant streams containing an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor. The reactant streams are reacted with one another in the pressure reactor at a pressure in the range of 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia by distilling off ammonia at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process can be employed particularly advantageously on the industrial scale.

    摘要翻译： α-羟基羧酸酯通过连续方法制备，其中α-羟基羧酰胺与醇在催化剂存在下反应，得到含有α-羟基羧酸酯，氨，未转化的α-羟基甲酰胺和醇以及催化剂的产物混合物; 其中将含有α-羟基甲酰胺，醇和催化剂的反应物流进料到压力反应器中。 反应物流在压力反应器中在1巴至100巴范围内的压力下彼此反应; 并且通过在不经额外的剥离介质的帮助下，在恒定地保持大于1巴的压力下蒸馏掉氨，产物混合物就会耗尽醇和氨。 该连续方法可以在工业规模上特别有利地使用。