Reaction tube and method for producing hydrogen cyanide

US10441942B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Martin Steffan · Darmstadt, DE
• Martin Steurenthaler · Singapore, SG
• Thomas Muller · Bad Homburg vor der Höhe, DE
• Martin Körfer · Goldbach, DE
• Steffen Krill · Mühltal, DE

Key dates

• Filing date: Oct 2, 2014
• Grant date: Oct 15, 2019
• Expiry date: Oct 2, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/30242
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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.