Urea → Urea

HRID 705397

Reaction equation

HRID 705397 reaction equation
[NH2:1][C:2]([NH2:4])=[O:3].O.O.[S:7]([O-:11])([O-:10])(=[O:9])=[O:8].[Ca+2]>O>[S:7]([O-:11])([O-:10])(=[O:9])=[O:8].[NH4+:1].[NH4+:1].[NH2:1][C:2]([NH2:4])=[O:3]

Participants

5

Reactant 2

HCID 1176UreaHCID 24928Calcium Sulfate Dihydrate

Product 2

HCID 1176UreaHCID 6097028Ammonium Sulfate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

The fertilizer coatings may be applied in batch mode by loading a targeted weight of urea prills or granules to a drum roller, roller mill, or other rolling-cylinder configuration, sprayed with between 1.0 and 1.75 percent water by weight, and rolled for about one minute to permit the urea surface to soften. Powdered calcium sulfate dihydrate (gypsum) is then added to the drum roller to provide a final ammonium sulfate to urea ratio of 1 to 3 (i.e., 25 percent ammonium sulfate by dry weight). Rolling of the urea and gypsum is continued for 2 minutes at which time, a polyurethane coating is applied at between 0.1 and 0.5 percent by weight by spraying with separate streams of isocyanate and polyol to improve the coating integrity.

Sources & evidence

ORD record
ord-934a4dda2c42417181e6bc1c86a72d99
Source dataset
uspto-grants-2015_11
Patent number
US09174885B2

Linked notes

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