Process for producing hydrogen cyanide and recovering hydrogen
AssigneeInvista North America S.A R.L.
InventorsJohn C. CATON, David W. RABENALDT
Life of this patent
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Abstract
Described is a process for the production and recovery of hydrogen cyanide, which includes recovering hydrogen from a crude hydrogen cyanide product. The process includes forming a crude hydrogen cyanide product and separating the crude hydrogen cyanide product to form an off-gas stream and a hydrogen cyanide product stream. The off-gas stream is further separated to recover hydrogen. The hydrogen cyanide product stream is further processed to recover hydrogen cyanide.
Claims21
1-15. (canceled)
A process for producing hydrogen cyanide comprising:
- (a) determining methane content of a methane-containing gas and purifying the methane-containing gas when the methane content is determined to be less than 90 vol. %;
- (b) reacting a ternary gas mixture comprising at least 25 vol. % oxygen in the presence of a catalyst to form a crude hydrogen cyanide product comprising hydrogen cyanide and off-gas, the ternary gas mixture comprising the methane-containing gas, an ammonia-containing gas, and an oxygen-containing gas;
- (c) separating the crude hydrogen cyanide product to form a hydrogen cyanide product stream comprising hydrogen cyanide, and an off-gas stream comprising hydrogen, water, carbon monoxide, and carbon dioxide;
- (d) separating the off-gas stream to form a hydrogen product stream comprising hydrogen, and a purge stream comprising carbon monoxide, carbon dioxide and water;
- and
- (e) recovering hydrogen cyanide from the hydrogen cyanide product stream.
A process for producing hydrogen cyanide comprising:
- (a) determining methane content of a methane-containing gas and purifying the methane-containing gas when the methane content is determined to be less than 90 vol. %;
- (b) reacting a ternary gas mixture comprising at least 25 vol. % oxygen in the presence of a catalyst to form a crude hydrogen cyanide product comprising hydrogen cyanide and off-gas, the ternary gas mixture comprising the methane-containing gas, an ammonia-containing gas, and an oxygen-containing gas;
- (e) separating the crude hydrogen cyanide product to form a hydrogen cyanide product stream comprising hydrogen cyanide, an ammonia stream, and an off-gas stream comprising hydrogen, water, carbon monoxide, and carbon dioxide;
- (d) separating the off-gas stream to form a hydrogen product stream comprising hydrogen, and a purge stream comprising carbon monoxide, carbon dioxide and water;
- and
- (e) recovering hydrogen cyanide from the hydrogen cyanide product stream.
A process for recovering hydrogen from an Andrussow process comprising:
- (a) reacting a ternary gas mixture comprising at least 25 vol. % oxygen in the presence of a catalyst to form a crude hydrogen cyanide product comprising hydrogen cyanide and off-gas, the ternary gas mixture comprising the methane-containing gas, an ammonia-containing gas, and an oxygen-containing gas;
- (b) separating the crude hydrogen cyanide product to form a hydrogen cyanide product stream comprising hydrogen cyanide, and an off-gas stream comprising hydrogen, water, carbon monoxide, and carbon dioxide;
- and
- (c) separating the off-gas stream in a pressure swing adsorber to recover hydrogen.
Dependencies are inferred from the claim text.