Transporting urea for quantitative conversion into ammonia
AssigneeUnion Oil Company of California
InventorDonald C. Young
Life of this patent
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Abstract
High purity ammonia is quantitatively produced from urea by reaction with water in the presence of acid. A major advantage of the invention is that urea can be safely transported to a conversion site, then converted to ammonia. The net result is that high purity ammonia is available wherever it is needed without the toxic hazard presented by transporting ammonia.
Claims28
A method for producing ammonia at a location of use otherwise remote from a source of ammonia comprising:
- transporting bulk urea to the location;
- contacting the urea with water and a polyprotic acid at elevated temperature to produce gaseous ammonia;
- and
- recovering the gaseous ammonia produced from the urea at the location.
A method for producing ammonia at a location of use otherwise remote from a source of ammonia comprising:
- (a) manufacturing urea in bulk;
- (b) transporting the urea manufactured to a location where ammonia is needed;
- (c) converting the urea into ammonia by reaction with water in the presence of an acid at a temperature greater than 45.degree. C.;
- and
- (d) recovering the gaseous ammonia produced.
A method for supplying ammonia at a location of use remote otherwise from a source of ammonia comprising:
- (a) manufacturing urea in bulk;
- (b) transporting the urea manufactured to a location where ammonia is needed;
- (c) reacting, in a first reaction zone, the transported urea with water in the presence of an acid at a temperature greater than 45.degree. C. to form a heat labile ammonium salt and substantially pure carbon dioxide;
- (d) heating, in a second reaction zone, the heat labile ammonium salt to form gaseous ammonia;
- and
- (e) recovering the gaseous anhydrous ammonia produced from the decomposition of the ammonium salt.
A method for producing ammonia comprising
- (a) transporting bulk urea by truck or rail from a first location to a second location;
- (b) substantially quantitatively converting the urea to ammonia at the second location by contacting the urea with concentrated aqueous phosphoric acid at a temperature greater than 45.degree. C.
A method for producing ammonia comprising
- (a) transporting bulk urea by offshore shipping or inshore barge traffic from a first location to a second location;
- (b) substantially quantitatively converting the urea to ammonia at the second location by contacting the urea with concentrated aqueous phosphoric acid at a temperature greater than 45.degree. C.
Dependencies are inferred from the claim text.