Process for preparing 4-aminodiphenylamines

Process for preparing 4-aminodiphenylamines

  • CN 1,307,556 A
  • Filed: 05/14/1999
  • Published: 08/08/2001
  • Est. Priority Date: 05/18/1998
  • Status: Abandoned Application
First Claim
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1. one kind prepares the method for choosing the 4-aminodiphenylamine that replaces wantonly, and it comprises:

  • (i) will choose wantonly the aniline of replacement and the optional oil of mirbane that replaces in the presence of water and alkali insteadShould, control simultaneously water for the amount of alkali in case guarantee the water that adds and alkali moleThan when coupled reaction begins, being not less than about 4;

    1 and not little when coupled reaction finishesIn about 0.6;

    1, thereby produce optional 4 nitrodiphenyl amine and/or the 4-that replacesNitrosodiphenylamine and/or their salt;

    The (ii) reaction product of step of hydrogenation (i) in the presence of the water of hydrogenation catalyst and interpolation,So that the mol ratio that guarantees total water and alkali when hydrogenation finishes at least about 4;

    1;

    (iii) separate hydrogenation catalyst from reaction mixture;

    And(iv) obtain water and organic phase from reaction mixture, with organic phase and aqueous phase separation,Separate the optional 4-aminodiphenylamine that replaces from organic phase again.

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