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4 records (took 0.02 seconds)

    1.
    发明专利
    未知

    公开(公告)号：NO20075532L

    公开(公告)日：2008-02-04

    申请号：NO20075532

    申请日：2007-11-02

    Applicant: BASF AG

    Inventor： OFTRING ALFRED ,  BRAUN GEROLD ,  WIRSING FRIEDRICH ,  STAMM ARMIN ,  KAI-UWE BALDENIUS

    IPC: C07C227/26

    Abstract: 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.

    Process for preparing low-by-product methylglycine-N, N-diacetic acid tri (alkali metal) salts
    2.
    发明专利
    Process for preparing low-by-product methylglycine-N, N-diacetic acid tri (alkali metal) salts 未知

    公开(公告)号：ZA200710628B

    公开(公告)日：2009-08-26

    申请号：ZA200710628

    申请日：2007-12-05

    Applicant: BASF AG

    Inventor： ARMIN STAMM ,  ALFRED OFTRING ,  KAI-UWE BALDENIUS ,  GEROLD BRAUN ,  FRIEDRICH WIRSING

    IPC: C07C20090101

    Abstract: 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.

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