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US 5,508,465 AGranted
Preparation of aliphatic alpha, omega-aminonitriles in the gas phase
AssigneeBASF SE
InventorsWerner Schnurr, Joachim Wulff-Doring, Rolf Fischer, Rudolf Bazner
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Abstract
Aliphatic alpha,omega-aminonitriles are prepared by partial hydrogenation of aliphatic alpha,omega-dinitriles at elevated temperatures in the presence of a catalyst in the gas phase by a process which comprises carrying out the hydrogenation with a catalyst based on at least one metal selected from the group consisting of nickel, cobalt, ruthenium and rhodium and with the proviso that the catalyst is not a powder.
Claims9
A process for the preparation of aliphatic alpha,omega-aminonitriles of the formula II
- NC--(CH.sub.2).sub.n --CH.sub.2 --NH.sub.2 II
- where n is an integer from 1 to 10, by partial hydrogenation of aliphatic alpha,omega-dinitriles of the formula I
- NC--(CH.sub.2).sub.n --CN I
- where n has the abovementioned meanings, in the gas phase at a temperature in the range of from 100.degree. to 250.degree. C. and at a pressure in the range of from 0.01 to 3 MPa, whereby the molar ratio of hydrogen to dinitrile I is chosen in the range of from 2:1 to 300:1, which process comprises:
- carrying out the reaction in a fixed-bed reactor using a fixed-bed catalst, the fixed-bed catalyst being at least one metal selected from the group consisting of nickel, cobalt, ruthenium and rhodium, and wherein the amount of catalyst is chosen so that the catalyst space velocity is from 0.03 to 10 kg of dinitrile I per kg of catalyst per hour.
2 more elements
Dependencies are inferred from the claim text.