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US 2026/0234013 A1Published application
Plant and process for producing a solid-state alkali metal cyanide product containing alkali metal hydroxide
AssigneeCyPlus GmbH
InventorsMarkus Jafeld, Ralf Struffert
Life of this patent
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Abstract
The present invention relates to a plant and to a process for producing a solid-state alkali metal cyanide product. In order to obtain a solid-state alkali metal cyanide product that has a good proportion by weight of alkali metal hydroxide, and in order to ensure that it remains as calm as possible in the plant during operation, it is proposed that the proportion by weight of alkali metal hydroxide in a suspension withdrawn from the crystallization vessel and sent to a solid-liquid separation device be increased before it enters the solid-liquid separation device.
Claims23
A plant for producing a solid-state alkali metal cyanide product containing alkali metal hydroxide, wherein the plant comprises:
- (i) a suspension production unit for producing a first suspension that contains a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals, wherein the suspension production unit has a crystallization vessel in which a suspension collection space for collecting first suspension is provided;
- (ii) a suspension withdrawal conduit for removing first suspension from the suspension collection space of the crystallization vessel;
- (iii) an alkali admixing unit for producing a second suspension containing a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals, by mixing into the first suspension a reactant liquid containing aqueously dissolved alkali metal hydroxide, wherein the proportion by weight of alkali metal hydroxide of the reactant liquid is higher than the proportion by weight of alkali metal hydroxide of the liquid phase of the first suspension,
- wherein the suspension withdrawal conduit fluidically interconnects the suspension collection space of the crystallization vessel of the suspension production unit and the alkali admixing unit, and first suspension can be led from the suspension collection space into the alkali admixing unit through the suspension withdrawal conduit;
- (iv) an alkali admixing unit removal conduit for removing second suspension from the alkali admixing unit;
- (v) a solid-liquid separation unit with which the second suspension can be separated by separating solid-phase of the second suspension into a solid-state alkali metal cyanide product and a third suspension containing a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals,
- wherein the alkali admixing unit removal conduit fluidically interconnects the alkali admixing unit and the solid-liquid separation unit, and second suspension can be led from the alkali admixing unit into the solid-liquid separation unit through the alkali admixing unit removal conduit;
- (vi) a first separation unit removal conduit for removing solid-state alkali metal cyanide product from the solid-liquid separation unit;
- (vii) a second separation unit removal conduit for removing third suspension from the solid-liquid separation unit.
6 more elements
-14. (canceled)
A process for producing a solid-state alkali metal cyanide product containing alkali metal hydroxide, the process comprising:
- (a) producing a first suspension containing a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals, in a suspension production unit, wherein the suspension production unit has a crystallization vessel;
- (b) removing first suspension from the crystallization vessel of the suspension production unit;
- (c) producing a second suspension containing a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals, by mixing first suspension removed from the crystallization vessel with a reactant liquid containing aqueously dissolved alkali metal hydroxide,
- wherein the proportion by weight of alkali metal hydroxide in the reactant liquid is higher than the proportion by weight of alkali metal hydroxide in the liquid phase of the first suspension;
- (d) introducing the second suspension into a solid-liquid separation unit and separating the second suspension into a solid-state alkali metal cyanide product and a third suspension containing a liquid phase with aqueously dissolved alkali metal cyanide and aqueously dissolved alkali metal hydroxide, and a solid phase with alkali metal cyanide crystals;
- (e) removing solid-state alkali metal cyanide product from the solid-liquid separation unit;
- (f) removing third suspension from the solid-liquid separation unit.
4 more elements
Dependencies are inferred from the claim text.