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    Method for the Production of Hydrocyanic Acid
    1.
    发明申请
    Method for the Production of Hydrocyanic Acid 有权
    生产氢氰酸的方法

    公开(公告)号：US20070231239A1

    公开(公告)日：2007-10-04

    申请号：US11574064

    申请日：2005-09-02

    申请人： Andreas Deckers ,  Arnulf Lauterbach ,  Anton Negele ,  Thomas Schneider

    发明人： Andreas Deckers ,  Arnulf Lauterbach ,  Anton Negele ,  Thomas Schneider

    IPC分类号： C01C3/02

    CPC分类号： C01C3/0204

    摘要： Process for preparing hydrocyanic acid by catalytic dehydration of gaseous formamide, in which a formamide-containing recycle stream is obtained from the product mixture after the dehydration and is recirculated to the dehydration, wherein the formamide-containing recycle stream contains from 5 to 50% by weight of water.

    摘要翻译： 通过气态甲酰胺的催化脱水制备氢氰酸的方法，其中在脱水后从产物混合物获得含甲酰胺的再循环物流并再循环至脱水，其中含甲酰胺的循环物流含有5-50％ 水的重量。

    Process for the preparation of a crystalline L-MGDA trialkali metal salt
    7.
    发明授权
    Process for the preparation of a crystalline L-MGDA trialkali metal salt 有权
    制备结晶L-MGDA三碱金属盐的方法

    公开(公告)号：US09227915B2

    公开(公告)日：2016-01-05

    申请号：US13463446

    申请日：2012-05-03

    申请人： Alfred Oftring ,  Maxim Weber ,  Gerold Braun ,  Arnulf Lauterbach

    发明人： Alfred Oftring ,  Maxim Weber ,  Gerold Braun ,  Arnulf Lauterbach

    IPC分类号： C07C227/42

    CPC分类号： C07C227/42 ,  C07C229/24

    摘要： A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-α-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-α-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-α-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150° C. is not exceeded during the alkaline saponification.

    摘要翻译： 提出了通过从L-α-丙氨酸开始通过Strecker合成得到的水溶液，通过与甲醛和氢氰酸反应得到L-谷氨酰胺，从而得到结晶L-MGDA三碱金属盐的方法， α-丙氨酸-N，N-二乙腈和随后的L-α-丙氨酸-N，N-二乙腈碱性皂化，得到L-MGDA三碱金属盐，其中在碱性条件下不超过150℃的温度 皂化

    PROCESS FOR THE PREPARATION OF A CRYSTALLINE L-MGDA TRIALKALI METAL SALT
    8.
    发明申请
    PROCESS FOR THE PREPARATION OF A CRYSTALLINE L-MGDA TRIALKALI METAL SALT 有权
    制备结晶L-MGDA试制金属盐的方法

    公开(公告)号：US20120283473A1

    公开(公告)日：2012-11-08

    申请号：US13463446

    申请日：2012-05-03

    申请人： Alfred OFTRING ,  Maxim Weber ,  Gerold Braun ,  Arnulf Lauterbach

    发明人： Alfred OFTRING ,  Maxim Weber ,  Gerold Braun ,  Arnulf Lauterbach

    IPC分类号： C07C227/42 ,  C07C229/24

    CPC分类号： C07C227/42 ,  C07C229/24

    摘要： A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-α-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-α-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-α-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150° C. is not exceeded during the alkaline saponification.

    摘要翻译： 提出了通过从L-α-丙氨酸开始通过Strecker合成得到的水溶液，通过与甲醛和氢氰酸反应得到L-谷氨酰胺，从而得到结晶L-MGDA三碱金属盐的方法， α-丙氨酸-N，N-二乙腈和随后的L-α-丙氨酸-N，N-二乙腈碱性皂化，得到L-MGDA三碱金属盐，其中在碱性条件下不超过150℃的温度 皂化

    Process for the preparation of aqueous solutions of methylglycine-N,N-diacetic acid trialkali metal salts
    10.
    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。