Urea gypsum addition product and method
OwnerRupen B. Seferian, Roy M. Kaprielianinventors
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Abstract
Soil supplement and plant nutrient and method therefor the supplement nutrient having the empirical formula (CaSO.sub.4).sub.2.2CO(NH.sub.2).sub.2 and being prepared by replacing the normal two waters of hydration of gypsum with urea by controlled heating in the substantial absence of unbound water. The product is a persistent nutrient.
Claims10
Method for conversion of dihydrate gypsum soil supplement into a plant nutrient containing slowly soil-releasable urea by controllably displacing the two waters of hydration of the gypsum with only two moles of urea to form an addition product having the empirical formula
- (CaSO.sub.4).sub.2.2CO(NH.sub.2).sub.2
- the method including slowly driving the two waters of hydration from the gypsum in an intimate reaction mixture substantially free of unbound water and comprising said gypsum and urea in a molecular ratio of three to four moles of gypsum per mole of urea, at a temperature between about 95.degree. and 140.degree.C to form said addition product within the reaction mixture, and cooling the reaction mixture to a frangible solid comprising said addition product.
(CaSO.sub.4).sub.2.2(CONH.sub.2).sub.2.
Dependencies are inferred from the claim text.