Method for the production of urea fertilizer with elemental...

Details Method for the production of urea fertilizer with elemental... Method for the production of urea fertilizer with elemental...

2011-08-16

2011-08-16

Ward, Jessica L (Department: 1735)

Chemistry: fertilizers

Processes and products

Organic material-containing

C071S027000, C071S011000

Reexamination Certificate

active

07998235

ABSTRACT:
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 sulphur/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.

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ChemTutor; Acids and Bases; www.chemtutor.com/acid.htm.
Database WPI, Week 199517, Derwent Publications Ltd., London, GB; Class A17, AN 1995-126054, & JP 7048194 A (Chisso Corp.), Feb. 21, 1995.

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