System and process for the production of uan
AssigneeStamicarbon B.V.
InventorStefano CICCHINELLI
Life of this patent
Estimating the term…
Abstract
Disclosed is a system for the production of urea ammonium nitrate (UAN), which is particularly suitable for processing relatively small ammonium nitrate waste streams into UAN. The system comprises a concentration for ammonium nitrate, a treatment section which allows recovering and recirculating nitrogen compounds entrained in vapor from the concentration section, and a pH control section allowing to adjust the pH of the processed ammonium nitrate waste stream to the extent necessary.
Claims11
A system for the production of urea ammonium nitrate (UAN) comprising an inlet for aqueous ammonium nitrate an inlet for liquid urea, and an outlet for UAN, the system comprising a concentration section configured to subject aqueous ammonium nitrate to evaporation so as to provide concentrated ammonium nitrate and, downstream of the concentration section and in fluid communication therewith, a production section configured to mix concentrated ammonium nitrate and liquid urea so as to produce UAN, wherein the concentration section has a gas outlet for water vapor, said gas outlet being in fluid communication with a treatment section configured to subject water vapor received from the concentration section to scrubbing, said treatment section having an inlet for scrubbing liquid and an outlet for used scrubbing liquid, wherein the outlet for used scrubbing liquid is in fluid communication with an inlet of the concentration section, and wherein the system comprises a pH control section such that the inlet for aqueous ammonium nitrate is in fluid communication with an inlet of the pH control section, wherein the pH control section is configured to subject aqueous ammonium nitrate to pH control, so as to provide a pH-controlled aqueous ammonium nitrate stream, wherein the pH control section has an outlet for the pH-controlled aqueous ammonium nitrate stream in fluid communication with an inlet of the concentration section.
A system for the production of urea ammonium nitrate (UAN) comprising an inlet for an acid aqueous ammonium nitrate stream, an inlet for liquid urea, and an outlet for UAN, the system comprising:
- a pH control section configured such that the inlet for the acid aqueous ammonium nitrate stream is in fluid communication with an inlet of the pH control section, wherein the pH control section is configured to subject the acid aqueous ammonium nitrate stream to pH control, so as to provide a pH-controlled aqueous ammonium nitrate stream, wherein the pH control section has an outlet for the pH-controlled aqueous ammonium nitrate stream;
- a concentration section connected with the pH control section to receive the pH-controlled aqueous ammonium nitrate stream and configured to subject the pH-controlled aqueous ammonium nitrate stream to evaporation by heating, so as to provide concentrated ammonium nitrate, wherein the concentration section has a gas outlet for water vapor;
- and,
- a production section, located downstream of the concentration section and in fluid communication therewith to receive the concentrated ammonium nitrate, and configured to mix the concentrated ammonium nitrate and a liquid urea stream so as to produce UAN,
- wherein the inlet for the acid aqueous ammonium nitrate stream is in fluid communication with an outlet of a chemical processing unit comprising an acidic ammonia scrubber producing the acid aqueous ammonium nitrate stream.
Dependencies are inferred from the claim text.