Low-temperature synthesis of urea
AssigneeContinental Oil Company
InventorRichard L. Every
Life of this patent
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Abstract
Urea is produced by reacting phosgene and ammonia, one of the reactants being in the liquid state and the other gaseous, at -50.degree. to -20.degree. C.
Claims8
A process for producing urea and ammonium chloride in high yield with a low level of impurities comprising combining as reactants phosgene and ammonia at a temperature in the range of about -70.degree. C. to about -20.degree. C. by adding one reactant to the other and maintaining the combination in said temperature range.
A process for producing a reaction product consisting essentially of urea and ammonium chloride comprising (a) contacting ammonia with phosgene, one of said ammonia and phosgene being in the liquid state and the other being in the gaseous sate, and (b) maintaining the temperature of the resulting reaction mixture between about -50.degree. C and about -20.degree. C.
A process for producing a reaction product consisting essentially of urea and ammonium chloride comprising (a) contacting ammonia with phosgene, one of said ammonia and phosgene being in the liquid state and the other being in the gaseous state, and (b) maintaining the temperature of the resulting reaction mixture at about -50.degree. C.
Dependencies are inferred from the claim text.