as solvent for organic polymers in a method for coating urea-containing granules

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United States of America

PATENT NO 12172144
SERIAL NO

17254117

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Abstract

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A process may be utilized to coat urea-containing granules with organic polymers. The process may involve compressing gaseous carbon dioxide and condensing the carbon dioxide to obtain liquid carbon dioxide, increasing the pressure and/or the temperature above the critical point of carbon dioxide and obtaining supercritical carbon dioxide, dissolving an organic polymer in the supercritical carbon dioxide to obtain a polymer-containing solution, and mixing the polymer-containing solution with urea-containing granules and lowering the temperature and/or the pressure below the critical point of carbon dioxide and obtaining coated urea-containing granules and gaseous carbon dioxide. In some cases the organic polymer may include biodegradable polymers, and the polymer-containing solution may contain between 20 to 70% by weight biodegradable polymers.

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Patent Owner(s)

Patent OwnerAddress
THYSSENKRUPP UHDE GMBH44141 DORTMUND

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
El, Hawary Tarek Holzwickede, DE 5 0
Makhynya, Yevgeny Mülheim, DE 6 1

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