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AssigneeEvonik Degussa GmbH
InventorsMartin Steffan, Martin Steurenthaler, Thomas Müller, Martin Körfer, Steffen Krill
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The reaction tube for preparing hydrogen cyanide comprises a cylindrical tube composed of ceramic, a catalyst comprising platinum applied to the inner wall of the tube and also at least one insert composed of ceramic, having three or four fins pointing from the tube axis to the inner wall of the tube, which is inserted into the cylindrical tube, wherein the fins divide the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean gap between the ends of the fins and the inner wall of the tube is in the range of 0.1 to 3 mm. In the method for preparing hydrogen cyanide, ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms are reacted in the reaction tube at 1000 to 1400° C.
A reaction tube for preparing hydrogen cyanide, comprising a cylindrical tube composed of ceramic and a catalyst comprising platinum applied to the inner wall of the tube, wherein at least one insert composed of ceramic is inserted into the cylindrical tube, said insert having three or four fins pointing from the tube axis to the inner wall of the tube, dividing the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean distance between the ends of the fins and the inner wall of the tube is in the range of from 0.5 to 3 mm and wherein the reaction tube has an internal diameter of 15 to 30 mm.
A method for preparing hydrogen cyanide by reacting ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms in the presence of a catalyst comprising platinum at a temperature of 1000 to 1400° C., wherein the reaction is carried out in at least one reaction tube, and wherein said reaction tube comprises a cylindrical tube composed of ceramic and a catalyst comprising platinum applied to the inner wall of the tube, wherein at least one insert composed of ceramic is inserted into the cylindrical tube, said insert having three or four fins pointing from the tube axis to the inner wall of the tube, dividing the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean distance between the ends of the fins and the inner wall of the tube is in the range of from 0.5 to 3 mm and wherein the reaction tube has an internal diameter of 15 to 30 mm.
Dependencies are inferred from the claim text.