Continuous manufacture of N-alkylated arylamines
AssigneeBASF SE
InventorsHans Joachim Szymanski, Toni Dockner
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Abstract
N-alkylated arylamines are prepared by reaction of arylamines which have at least one hydrogen atom on the nitrogen, with olefins or cycloolefins which can have substituents which are inert under the reaction conditions, at temperatures from 180.degree. to 450.degree.C, in the presence of catalysts. The improvement is that silicic acid which contains from 0.1 to 30 percent by weight of phosphoric acids, based on silicic acid, is used as the catalysts and that catalytic amounts of water are employed. N-alkylated arylamines are starting materials for the manufacture of dyes, pesticides, plant protection agents and growth regulators, and can also be used as mineral oil additives.
Claims7
An improved process for the continuous manufacture of N-alkylated arylamines by reaction of arylamines which have at least one hydrogen atom on the nitrogen, with olefins having 2-10 carbon atoms or cycloolefins having 5 to 8 carbon atoms, which can have substituents which are inert under the reaction conditions, at temperatures from 180.degree. to 450.degree.C, in the presence of catalysts, wherein the improvement comprises using silicic acid which contains from 0.1 to 30 percent by weight of phosphoric acid, based on silicic acid, as the catalyst and catalytic amounts of water of 0.1 to 30 mole percent, based on the arylamine, and feeding phosphoric acid or a phosphoric acid alkyl ester continuously to the catalyst during the reaction.
Dependencies are inferred from the claim text.