System for producing technical grade ammonium nitrate and method of producing thereof
AssigneeYara International Asa
InventorBernard LAURENT
Life of this patent
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Abstract
A method and system for producing ammonium nitrate particles having a density ranging from 650.0 g/l to 850.0 g/l and a porosity ranging from 6.0% to 14.0%, wherein ammonium nitrate particles, including at least 0.350% by weight of water, having a density above 850.0 g/l and having a porosity below 6.0%, are heated using microwave energy with a frequency ranging from 300.0 MHz to 300.0 GHz, thereby decreasing the density and increasing the porosity of the ammonium nitrate particles.
Claims25
-15. (canceled)
A method for producing ammonium nitrate particles having a density ranging from 650.0 g/l to 850.0 g/l and a porosity ranging from 6.0% to 14.0%, comprising steps of:
- a) providing ammonium nitrate particles comprising at least 0.350% by weight of water, having a density above 850.0 g/l and having a porosity below 6.0%;
- and
- b) heating the ammonium nitrate particles using microwave energy wherein a frequency ranging from 300.0 MHz to 300.0 GHz is applied and wherein the heating step is performed at a temperature ranging from 20.0° C. to 50.0° C., thereby decreasing the density and increasing the porosity of the ammonium nitrate particles.
A system for preparing technical grade ammonium nitrate particles having a density ranging from 650.0 g/l to 850.0 g/l and a porosity ranging from 6.0% to 14.0% comprising:
- a reactor for reacting ammonia and nitric acid, thereby providing an ammonium nitrate solution;
- an evaporator for evaporating the ammonium nitrate solution and producing an ammonium nitrate melt;
- and
- a particulation system for particulating the ammonium nitrate melt and providing standard grade ammonium nitrate particles having a density above 850.0 g/l and having a porosity below 6.0%;
- characterized in that the system further comprises a microwave heating system configured for heating the standard grade ammonium nitrate particles using electromagnetic radiation to a temperature ranging from 20.0° C. to 50.0° C. and configured for providing microwave energy with a frequency ranging from 300.0 MHz to 300.0 GHz, thereby decreasing the density and increasing the porosity of the ammonium nitrate particles, thereby preparing technical grade ammonium nitrate particles.
A method for revamping an ammonium nitrate production facility comprising a reactor for reacting ammonia and nitric acid, thereby producing an ammonium nitrate solution;
- an evaporator for evaporating the ammonium nitrate solution, thereby producing an ammonium nitrate melt;
- a particulation system for particulating the ammonium nitrate melt, thereby providing solid ammonium nitrate particles having a density above 850.0 g/l and having a porosity below 6.0%;
- a dryer for drying the ammonium nitrate particles;
- and a cooler for reducing a temperature of the ammonium nitrate particles, wherein the dryer and the cooler are replaced with a microwave heating system, wherein the microwave heating system provides microwave energy with a frequency ranging from 300.0 MHz to 300.0 GHz at a temperature ranging from 20.0° C. to 50.0° C., thereby forming ammonium nitrate particles having a density ranging from 650.0 g/l to 850.0 g/l and a porosity ranging from 6.0% to 14.0%.
Dependencies are inferred from the claim text.