US 12,252,450 B2
Aqueous and solid ammonium sulfate fertilizers and methods of producing
Scott Severson, Valparaiso, IN (US)
Assigned to M.A.R.G., LLC, Valparaiso, IN (US)
Filed by M.A.R.G., LLC., Valparaiso, IN (US)
Filed on May 13, 2021, as Appl. No. 17/319,712.
Application 17/319,712 is a continuation in part of application No. 17/096,533, filed on Nov. 12, 2020, granted, now 11,999,664.
Claims priority of provisional application 62/934,279, filed on Nov. 12, 2019.
Prior Publication US 2021/0269371 A1, Sep. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C05C 3/00 (2006.01); C05D 3/02 (2006.01); C05G 1/00 (2006.01); C05G 5/20 (2020.01)
CPC C05C 3/00 (2013.01) [C05D 3/02 (2013.01); C05G 1/00 (2013.01); C05G 5/20 (2020.02)] 20 Claims
OG exemplary drawing
 
1. An aqueous ammonium sulfate fertilizer having at least 3.5% nitrogen and at least 4% sulfur, and derived from an organic feedstock and a mineral sulfate compound, wherein the aqueous ammonium sulfate fertilizer contains ammoniacal nitrogen and organic sulfur.
 
12. The aqueous ammonium sulfate fertilizer of claim 1, wherein the aqueous ammonium sulfate fertilizer is produced by a process comprising the steps of:
preparing an organic feedstock that contains at least one nitrogen compound by causing organic animal manure and/or organic food waste to undergo anaerobic digestion;
removing solids from the organic feedstock to produce an organic liquid effluent that contains at least one of ammonium and ammonia;
performing a distillation process on the organic liquid effluent to strip and concentrate a vapor mixture therefrom that contains ammonia, carbon dioxide, and water, and cool the vapor mixture to produce a condensed solution containing ammonium bicarbonate and/or ammonium carbonate; and
contacting the condensed solution with the mineral sulfate compound to cause a reaction therebetween and produce an aqueous ammonium sulfate product.
 
13. A solid ammonium sulfate fertilizer containing about 21% nitrogen and about 24% sulfur, and derived from an organic feedstock and a mineral sulfate compound, wherein the solid ammonium sulfate fertilizer contains ammoniacal nitrogen and organic sulfur.
 
20. The solid ammonium sulfate fertilizer of claim 13, wherein the solid ammonium sulfate fertilizer is produced by a process comprising the steps of:
preparing an organic feedstock that contains at least one nitrogen compound by causing organic animal manure and/or organic food waste to undergo anaerobic digestion;
removing solids from the organic feedstock to produce an organic liquid effluent that contains at least one of ammonium and ammonia;
performing a distillation process on the organic liquid effluent to strip and concentrate a vapor mixture therefrom that contains ammonium bicarbonate and cool the vapor mixture to produce a condensed solution containing ammonium bicarbonate and/or ammonium carbonate;
contacting the condensed solution with the mineral sulfate compound to cause a reaction therebetween and produce an aqueous ammonium sulfate product; and
performing an evaporation process on the aqueous ammonium sulfate product to remove water therefrom and produce a dry, solid ammonium sulfate product.