Method for regenerating catalysts

Details Method for regenerating catalysts Method for regenerating catalysts

B - Operations, Transporting

01

J

B01J 38/52 (2006.01) B01J 23/94 (2006.01) C07C 209/48 (2006.01)

Patent

CA 2422937

The invention relates to a method for regenerating a heterogeneous catalyst, which is used with hydrogen, in order to produce compounds containing NH2 groups by hydrogenating compounds that contain at least one unsaturated carbon- nitrogen bond. The inventive method is characterized in that: a) the supply of the compound to be hydrogenated is stopped, and; b) the heterogeneous catalyst or mixtures thereof is/are treated with a compound of formula (I) R1R2N-CO-R3, whereby R1 represents hydrogen and C1-C4 alkyl, R2 and R3, independent of one another, represent hydrogen and C1-C4 alkyl or, together, represent a C3-C6 alkylene group, under a pressure ranging from 0.1 to 30 MPa and at a temperature ranging from 100 to 300 ~C. The heterogeneous catalyst is treated with said compound of formula (I) provided that this compound is liquid during the treatment.

L'invention concerne un procédé permettant de régénérer un catalyseur hétérogène utilisé avec de l'hydrogène, afin de produire des composés contenant des groupes NH¿2?, par hydrogénation de composés qui contiennent au moins une liaison carbone-azote insaturée. Ce procédé se caractérise en ce qu'il est prévu a) de bloquer l'alimentation du composé à hydrogéner et b) de traiter le catalyseur hétérogène avec un composé de formule R?1¿R?2¿N-CO-R?3¿ (I), R?1¿ désignant hydrogène, alkyle C¿1?-C¿4?, R?2¿, R?3¿ désignant indépendamment l'un de l'autre dans chaque cas, hydrogène, alkyle C¿1?-C¿4? ou conjointement, un groupe alkylène C¿3?-C¿6?, ou leurs mélanges à une pression de l'ordre de 0,1 à 30 Mpa et à une température de l'ordre de 100 à 300 ·C, sous réserve que le composé de formule (I) soit liquide lors du traitement.

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