Alkali metal cyanide production
AssigneeCyanco Corporation
InventorsMichael Lefenfeld, Robert Hoch, Justin Manganaro, Roy Norcross, Si Kai Tan
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Abstract
This disclosure relates to improved methods for alkali metal cyanide production, particularly to improved methods for sodium cyanide production. The improved method of producing sodium cyanide involves the step of contacting hydrogen cyanide with an aqueous solution of sodium carbonate or of a mixture of sodium carbonate and sodium bicarbonate to produce a sodium cyanide solution.
Claims21
A method of producing an alkali metal cyanide comprising the steps of:
- contacting hydrogen cyanide with an aqueous solution of an alkali metal carbonate or of a mixture of alkali metal carbonate and alkali metal bicarbonate in a reaction chamber under reaction conditions sufficient to produce an aqueous alkali metal cyanide solution,
- removing a gaseous effluent from the reaction chamber,
- removing the aqueous alkali metal cyanide solution from the reaction chamber as a liquid effluent, and
- separating any solid alkali metal bicarbonate present in the liquid effluent from the aqueous alkali metal cyanide solution.
A method of producing an alkali metal cyanide comprising the steps of:
- contacting hydrogen cyanide with an aqueous solution of an alkali metal carbonate or of a mixture of alkali metal carbonate and alkali metal bicarbonate under reaction conditions sufficient to produce an aqueous alkali metal cyanide solution,
- wherein the aqueous solution of an alkali metal carbonate or of a mixture of alkali metal carbonate and alkali metal bicarbonate is contacted with excess hydrogen cyanide.
A method for producing sodium cyanide comprising the steps of:
- reacting hydrogen cyanide with an aqueous solution of sodium carbonate in a first reaction chamber under reaction conditions sufficient to produce an aqueous sodium cyanide solution,
- removing a gaseous effluent from the reaction chamber,
- removing the aqueous sodium cyanide solution from the reaction chamber as a liquid effluent, and
- separating any solid sodium bicarbonate present in the liquid effluent from the aqueous sodium cyanide solution.
A system for producing alkali metal cyanide comprising:
- a reaction chamber for contacting hydrogen cyanide with an aqueous solution of an alkali metal carbonate or of a mixture of an alkali metal carbonate and an alkali metal bicarbonate to produce an alkali metal cyanide solution;
- a gas phase output port in communication with the reaction chamber for discharging a gaseous effluent created in the reaction chamber;
- a liquid phase output port in communication with the reaction chamber for discharging a liquid effluent created in the reaction chamber;
- a separation device for receiving the liquid effluent and separating a solid bicarbonate from the liquid effluent.
Dependencies are inferred from the claim text.