Preparation methods of calcium sulphate and urea adduct

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Preparation methods of calcium sulphate and urea adduct

The paper presents the results of laboratory studies on the preparation of calcium sulphate and urea adduct by: grinding, compacting and mixing in the presence of physical water. A method for the measurement of urea conversion into the adduct form, which is based on the difference in solubility of free urea and the adduct bound urea CaSO4·4CO(NH2)2 in n-butanol, was developed. Mixing the reagents in the presence of physical water produced the best results. High urea conversion into the adduct form, over 85%, in the prepared samples indicates that this method can be successfully used to get CaSO4·4CO(NH2)2 adduct.

Tengler S.: Niektóre międzycząsteczkowe połączenia mocznika ze związkami nieorganicznymi, Chemik, 1972, 8, 308.

Durski Z.: Krystaliczne addukty mocznika ze związkami nieorganicznymi, Wiadomości. Chemiczne, 1971, 25, 829.

Whittaker C., Lundstom F., Hendricks S.: Reaction between urea and gypsum, Industrial & Engineering Chemistry, 1933, 11, 1280.

Achard P., Schwob Y., Limousin L.: A new route for urea-superphosphate fertilizers, Phosphorus & Potassium, 1994, 191, 27.

Patent USA 2074880, 1937.

Nagai S., Hara Z.: Studies on gypsum - urea or urea - calcium sulphate complex I, Journal of Society Chemical Industry Japan, Suppl. Bind., 1939, 42, 210.

Nagai S., Miyake R., Studies on gypsum - urea or urea - calcium sulphate complex II, Journal of Society Chemical Industry Japan, Suppl. Bind., 1940, 43, 209.

Kotuła E., Nowak R.: Czteromocznikan siarczanu wapnia - nawóz azotowo-siarkowo-wapniowy jako alternatywa utylizacji fosfogipsu, Prace Nauk. Politechniki Szczecińskiej, 1998, 547, ITN 5, 91.

Maciaszek, S.: Mocznik, WNT, Warszawa 1967.

Patent USA 3976467, 1976.

Polish Journal of Chemical Technology

The Journal of West Pomeranian University of Technology, Szczecin

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