Hydrogen cyanide manufacturing process with second waste heat boiler
AssigneeInvista North America S.A R.L.
InventorsJohn C. CATON, John J. OSTERMAIER, William J. STEINER
Life of this patent
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Abstract
Described is a method for the production and recovery of hydrogen cyanide, which includes removing ammonia from a crude hydrogen cyanide stream. The method integrates heat removed from a crude hydrogen cyanide stream into other areas of the hydrogen cyanide recovery process. The crude hydrogen cyanide stream may be passed through a first waste heat boiler and a second waste heat boiler prior to being fed to an ammonia absorber, which produces a hydrogen cyanide rich stream. Hydrogen cyanide is recovered from the hydrogen cyanide rich stream. Equipment fouling with HCN polymer is reduced.
Claims15
A method for recovering hydrogen cyanide from a crude hydrogen cyanide stream, comprising:
- passing the crude hydrogen cyanide stream comprising hydrogen cyanide and ammonia through a first waste heat boiler to reduce the temperature of the hydrogen cyanide stream;
- directly passing the reduced temperature hydrogen cyanide stream through a second waste heat boiler to cool the reduced temperature hydrogen cyanide stream, wherein the cooled hydrogen cyanide stream remains in the gas phase;
- separating the cooled hydrogen cyanide stream in an ammonia absorber to form an ammonia rich stream and a hydrogen cyanide stream;
- and
- recovering hydrogen cyanide from the hydrogen cyanide stream.
Dependencies are inferred from the claim text.