Patent ID: 11897781
Assignee: EVONIK OPERATIONS GMBH
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for producing hydrogen cyanide, comprising passing a feed mixture comprising ammonia and methane through reaction tubes, coated on the inner surface with a catalyst comprising platinum, at a reaction temperature of 1000° C. to 1400° C. to provide a product gas mixture comprising hydrogen cyanide, hydrogen, unreacted ammonia and unreacted methane, the ammonia concentration in said product gas mixture being higher than the methane concentration in said product gas mixture, wherein for a time period of at least 100 h a concentration difference between said ammonia concentration and said methane concentration is maintained in a range of from 1.05% by volume to 3.0% by volume for at least 80% of the time by adjusting the reaction temperature, adjusting the molar ratio of ammonia to carbon in the feed mixture, adjusting a feed rate of said feed mixture, or any combination of said adjustments.