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    • 48. 发明授权
    • Method for producing methylglycine-N,N-diethanoic acid-trialkali metal salts with a low by-product content
    • 具有低副产物含量的甲基甘氨酸-N,N-二乙酸 - 三烷基金属盐的制备方法
    • US07671234B2
    • 2010-03-02
    • US11913597
    • 2006-05-02
    • Alfred OftringGerold BraunFriedrich WirsingArmin StammKai-Uwe Baldenius
    • Alfred OftringGerold BraunFriedrich WirsingArmin StammKai-Uwe Baldenius
    • C07C227/26C07C229/16
    • C07C227/26C07C229/16
    • The invention relates to a process for preparing low-by-product, light-color methylglycine-N,N-diacetic acid tri(alkali metal) salt by alkaline hydrolysis of methylglycinediacetonitrile (MGDN), comprising the steps in the sequence (a) to (f): (a) mixing of MGDN with aqueous alkali at a temperature of ≦30° C.; (b) allowing the aqueous alkaline MGDN suspension to react at a temperature in the range from 10 to 30° C. over a period of from 0.1 to 10 h to form a solution; (c) allowing the solution from step (b) to react at a temperature in the range from 30 to 40° C. over a period of from 0.1 to 10 h; (d) optionally allowing the solution from step (c) to react at a temperature in the range from 50 to 80° C. over a period of from 0.5 to 2 h; (e) optionally allowing the solution from step (c) or (d) to react at a temperature in the range from 110 to 200° C. over a period of from 5 to 60 min; (f) hydrolysis and removal of ammonia of the solution obtained in step (c), (d) or (e) by stripping at a temperature of from 90 to 105° C.
    • 本发明涉及通过甲基甘氨二乙腈(MGDN)的碱水解制备低副产物,浅色甲基甘氨酸-N,N-二乙酸三(碱金属)盐的方法,包括步骤(a)至 (f):(a)在温度为30℃的温度下,将MGDN与碱水溶液混合; (b)使含水碱性MGDN悬浮液在10至30℃的温度下反应0.1至10小时以形成溶液; (c)允许来自步骤(b)的溶液在0.1至10小时的时间内在30至40℃的温度下反应; (d)任选地允许步骤(c)的溶液在0.5至2小时的时间内在50至80℃的温度下反应; (e)任选地允许来自步骤(c)或(d)的溶液在110至200℃的温度下在5至60分钟的时间内反应; (f)通过在90至105℃的温度下汽提来水解和除去在步骤(c),(d)或(e)中获得的溶液中的氨。