Process for shipment of sodium cyanide slurries
AssigneeE. I. Du Pont de Nemours and Company
InventorsJanet M. Rogers, Harold F. Porter
Life of this patent
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Abstract
A process for manufacturing, shipping and unloading substantially solid, ice-like sodium cyanide dihydrate containing essentially no liquid water. A slurry of 58 weight percent or higher sodium cyanide is rapidly cooled to the anhydrous/dihydrate transition temperature while minimizing the settling out of sodium cyanide crystals to form the product in a container. Dissolution prior to unloading is by adding heat and water or dilute sodium cyanide solution.
Claims6
A process for preparing sodium cyanide for shipment comprising, (a) forming a slurry of sodium cyanide crystals to be shipped which has a concentration greater than 58 wt. % total sodium cyanide at a temperature above about 35.degree. C. and contains from about 1 to 5 wt. % of a base selected from sodium hydroxide or sodium carbonate, and (b) evaporatively cooling the slurry in a shipping container while minimizing the settling out of said crystals to a temperature below the anhydrous/dihydrated transition temperature to form a sodium cyanide dihydrate product having no more than about 5 wt. % liquid.
A process for shipping sodium cyanide which comprises:
- (a) forming a slurry of sodium cyanide crystals at a temperature of from about 40 .degree. to about 70.degree. C. which has a concentration of at least about 58 wt. % total sodium cyanide and from about 1 to 5 wt. % of a base;
- (b) evaporatively cooling the slurry in a shipping container to a temperature below the anhydrous/dihydrated transition temperature to form a substantially solid sodium cyanide dihydrate having no more than about 5 wt. % liquid;
- and
- (c) shipping the dihydrate.
Dependencies are inferred from the claim text.