Urea ammonium nitrate production comprising condensation
AssigneeStamicarbon B.V.
InventorsGiusy Elisa Puci, Joey Dobree
Life of this patent
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Abstract
The invention relates to a process for the production of urea ammonium nitrate, a system and a method of modifying a plant. The process comprises subjecting ammonia-containing off-gas resulting from the production of ammonium nitrate (AN off-gas) to condensation under acidic conditions so as to form an acidic a acidic scrubbing liquid in a finishing treatment section having a gas inlet in fluid communication with a gas outlet of a finishing section of a urea production unit, wherein the finishing section is adapted to solidify urea liquid, and wherein said finishing treatment section is adapted to subject ammonia-containing off-gas of the finishing section to treatment with an acidic scrubbing liquid.
Claims18
A method for the production of urea ammonium nitrate comprising
- (a) subjecting ammonia and carbon dioxide to urea forming conditions so as to obtain an aqueous urea solution,
- (b) purifying the aqueous urea solution in a recovery section to remove residual ammonium carbamate so as to form a purified aqueous urea solution, and optionally subjecting at least part of the purified aqueous urea solution to evaporation so as to form concentrated urea liquid,
- (c) subjecting ammonia and nitric acid to ammonium nitrate forming conditions so as to form an aqueous ammonium nitrate solution;
- (d) combining said aqueous ammonium nitrate solution and at least a part of the purified aqueous urea solution and/or concentrated urea liquid in a urea ammonium nitrate section so as to obtain an aqueous solution of urea ammonium nitrate;
- (e) subjecting ammonia-containing off-gas resulting from the production of ammonium nitrate (AN off-gas) to condensation under acidic conditions so as to form an acidic condensate, and using at least part of the acidic condensate as an acidic scrubbing liquid in an off-gas treatment section downstream of a urea finishing section, said off-gas treatment section having a gas inlet in fluid communication with a gas outlet of said urea finishing section of a urea production unit, wherein the urea finishing section is adapted to solidify urea liquid, and wherein said off-gas treatment section is adapted to subject ammonia-containing off-gas of the urea finishing section to treatment with an acidic scrubbing liquid.
A system for the production of at least urea and urea ammonium nitrate comprising:
- (a) a urea production unit comprising a urea finishing section, wherein the urea finishing section has a gas outlet for ammonia-containing off-gas,
- (b) an ammonium nitrate section for producing ammonium nitrate in fluid communication with a source of nitric acid and a source of ammonia, having an outlet for aqueous ammonium nitrate solution and an outlet for off-gas, and a condensation section in fluid communication with said outlet for off-gas, for condensing at least part of said off-gas to form an acidic condensate,
- (c) a urea ammonium nitrate section comprising a unit having an inlet in fluid connection with said outlet for aqueous ammonium nitrate solution and an inlet for receiving urea liquid, for combining said ammonium nitrate solution and said urea liquid, and having an outlet for urea ammonium nitrate solution, and
- (d) an off-gas treatment section downstream of a urea finishing section, having a gas inlet in fluid connection with said gas outlet for off-gas of said urea finishing section, adapted to subject ammonia-containing off-gas of the urea finishing section to treatment with an acidic scrubbing liquid,
- wherein said off-gas treatment section comprises an inlet in fluid communication with said condensation section for receiving said acidic condensate.
Dependencies are inferred from the claim text.