Process for preparing ammonium sulfate nitrate
AssigneeHoneywell International Inc.
InventorsStephanie C. Barthe, James A. Kweeder, Maria A. Azimova, Raymond G. Wissinger, Christopher B. Pace, Joshua H. McGill, Keith D. Cochran, Andrew J. Howes
Life of this patent
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Abstract
Ammonium sulfate nitrate double salts may be produced using a process that result in complete or nearly complete conversion to the 2:1 double salt. In some embodiments, the disclosure pertains to methods of controlling moisture content during the production process.
Claims17
A method of producing a solid ammonium sulfate nitrate composition comprising the step of:
- solidifying a melt slurry including ammonium sulfate and ammonium nitrate in a granulation bed to form the solid ammonium sulfate nitrate composition comprising ammonium sulfate nitrate 2:1 double salt, wherein the melt slurry has a molar ratio of ammonium sulfate to ammonium nitrate of about 0.9:1 to about 1.1:1, wherein the granulation bed has an operating temperature of 90° C. to 120° C. and the solid ammonium sulfate nitrate composition has a moisture content of between 0.4 wt. % and 2.0 wt. % wherein the solid ammonium sulfate nitrate composition is primarily in the form of the ammonium sulfate nitrate 2:1 double salt and includes less than about 7 wt. % of unreacted ammonium nitrate and ammonium sulfate nitrate 3:1 double salt.
A method of producing a solid ammonium sulfate nitrate composition including ammonium sulfate nitrate 2:1 double salt, said method comprising the steps of:
- adding a melt slurry including ammonium sulfate and ammonium nitrate to a granulation device, wherein the melt slurry has a molar ratio of ammonium sulfate to ammonium nitrate of about 0.9:1 to about 1.1:1;
- adding an amount of supplemental ammonia to the granulation device in addition to ammonia provided in the melt slurry;
- solidifying the melt slurry in the granulation device in the presence of the supplemental ammonia to form a solid granule mixture including ammonium sulfate nitrate 2:1 double salt, wherein the solid ammonium sulfate nitrate composition is primarily in the form of the ammonium sulfate nitrate 2:1 double salt and includes less than about 7 wt. % of unreacted ammonium nitrate and ammonium sulfate nitrate 3:1 double salt.
A method of producing a solid ammonium sulfate nitrate composition, said method comprising the steps of:
- adding a melt slurry including ammonium sulfate and ammonium nitrate to a granulation bed of a granulation device wherein the melt slurry has a molar ratio of ammonium sulfate to ammonium nitrate of about 0.9:1 to about 1.1:1;
- solidifying the melt slurry in the granulation bed of the granulation device to form the solid ammonium sulfate nitrate composition, including ammonium sulfate nitrate 2:1 double salt;
- drying the solid mixture in a drying device such that a moisture content of the solid ammonium sulfate nitrate composition in the drying device is between 0.4 wt. % and 1.5 wt. %, wherein the solid ammonium sulfate nitrate composition is primarily in the form of the ammonium sulfate nitrate 2:1 double salt and include less than about 7 wt. % of unreacted ammonium nitrate and ammonium sulfate nitrate 3:1 double salt.
A method of producing a solid ammonium sulfate nitrate composition including ammonium sulfate nitrate 2:1 double salt, said method comprising the steps of:
- solidifying a melt slurry including ammonium sulfate and ammonium nitrate in a granulation device to form solid ammonium sulfate nitrate granules including ammonium sulfate nitrate 2:1 double salt, wherein the melt slurry has a molar ratio of ammonium sulfate to ammonium nitrate of about 0.9:1 to about 1.1:1, wherein the solid ammonium sulfate nitrate has a moisture content of 0.4 to 2.0 wt. %, wherein the solid ammonium sulfate nitrate granules include less than about 7 wt. % of unreacted ammonium nitrate and ammonium sulfate nitrate 3:1 double salt.
Dependencies are inferred from the claim text.