C - Chemistry – Metallurgy – 05 – C
Patent
C - Chemistry, Metallurgy
05
C
C05C 9/00 (2006.01)
Patent
CA 2488421
The present invention relates to a method for the production of a urea fertilizer with elemental sulphur from sulphur in liquid stage and a liquid urea melt. The surface tension between the two phases of sulphur and urea are influenced in the liquid stage at temperatures above the melting points, by supply of an additive being temperature stable and amphoteric to the liquid suphur / urea melt to obtain a homogeneous mixed phase, that subsequently is distributed and solidified. The invention also relates to a urea - sulphur fertilizer where the fertilizer comprises urea and elemental sulphur and an additive being temperature stable and amphoteric.
L'invention concerne un procédé de production d'un engrais d'urée avec du soufre élémentaire à partir de soufre à l'état liquide et d'un bain d'urée liquide. La tension de surface entre les deux phases de soufre et d'urée est influencée à l'état liquide à des températures supérieures aux points de fusion, par ajout d'un additif thermostable et amphotère au soufre liquide/bain d'urée en vue d'obtenir une phase mélangée homogène, qui est ensuite répartie et solidifiée. L'invention concerne également un engrais d'urée-soufre contenant de l'urée et du soufre élémentaire ainsi qu'un additif thermostable et amphotère.
Kohnke Sven
Ladwig Uwe
Maaz Juergen
Stark Udo
Fetherstonhaugh & Co.
Yara International Asa
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