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124 条记录 (耗时 0.021 秒)

    Process for the preparation of aqueous solutions of methylglycine-N,N-diacetic acid trialkali metal salts
    77.
    发明授权
    Process for the preparation of aqueous solutions of methylglycine-N,N-diacetic acid trialkali metal salts 有权
    制备甲基甘氨酸-N，N-二乙酸三烷基金属盐水溶液的方法

    公开(公告)号：US08802894B2

    公开(公告)日：2014-08-12

    申请号：US13431381

    申请日：2012-03-27

    申请人： Alfred Oftring ,  Gerold Braun ,  Arnulf Lauterbach

    发明人： Alfred Oftring ,  Gerold Braun ,  Arnulf Lauterbach

    IPC分类号： C07C227/18

    CPC分类号： C07C253/00 ,  C07C227/26 ,  C07C255/25 ,  C07C229/12

    摘要： A process for preparing an aqueous solution of a methylglycine-N,N-diacetic acid trialkali metal salt at a high yield and purity by Strecker synthesis, the process including: reacting an aqueous solution containing α-alanine with formaldehyde and hydrocyanic acid, to obtain α-alanine-N,N-diacetonitrile in one reaction unit; and saponification of the α-alanine-N,N-diacetonitrile with a base, to obtain the methylglycine-N,N-diacetic acid trialkali metal salt, wherein the α-alanine is partially neutralized and the addition of formaldehyde and hydrocyanic acid are controlled such that a concentration of free hydrocyanic acid in the liquid reaction mixture at any time is limited such that secondary reactions that produce formaldehyde cyanohydrin, consecutive reactions of formaldehyde cyanohydrin, and the polymerization of hydrocyanic acid, only occur insofar as the specification requirements, such as nitrilotriacetic acid content and color, for methylglycine-N,N-diacetic acid trialkali metal salts are observed.

    摘要翻译： 一种通过Strecker合成以高产率和纯度制备甲基甘氨酸-N，N-二乙酸三烷基金属盐的水溶液的方法，该方法包括：使含有α-丙氨酸的水溶液与甲醛和氢氰酸反应，得到 α-丙氨酸-N，N-二乙腈在一个反应​​单元中; 并用碱对α-丙氨酸-N，N-二乙腈进行皂化，得到甲基甘氨酸-N，N-二乙酸三碱金属盐，其中α-丙氨酸被部分中和，加入甲醛和氢氰酸被控制 使得在任何时候液体反应混合物中的游离氢氰酸的浓度受到限制，使得产生甲醛氰醇的二次反应，甲醛氰醇的连续反应和氢氰酸的聚合仅发生在规范要求的范围内，例如 观察到甲基甘氨酸-N，N-二乙酸三烷基金属盐的次氮基三乙酸含量和颜色。

    Method for production of n-phosphonomethylglycine
    79.
    发明授权
    Method for production of n-phosphonomethylglycine 失效
    n-膦酰基甲基甘氨酸的生产方法

    公开(公告)号：US06818793B2

    公开(公告)日：2004-11-16

    申请号：US10168717

    申请日：2002-06-24

    申请人： Christian Wulff ,  Stefan Orsten ,  Alfred Oftring

    发明人： Christian Wulff ,  Stefan Orsten ,  Alfred Oftring

    IPC分类号： C07F928

    CPC分类号： C07F9/4093 ,  C07F9/3813

    摘要： The present invention relates to a process for the preparation of N-phosphonomethylglycine by reacting a hexahydrotriazine derivative with a triacyl phosphite. The process gives N-phosphonomethylglycine in high yield and in a simple and inexpensive manner.

    摘要翻译： 本发明涉及通过使六氢三嗪衍生物与亚磷酸三酰基酯反应来制备N-膦酰基甲基甘氨酸的方法。 该方法以高产率和简单且廉价的方式得到N-膦酰基甲基甘氨酸。