Process for preparing a urea-sulphur fertiliser

Patent metadata

Field	Value
Publication number	US-10221106-B2
Application number	US-201515329059-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 28, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A process for the manufacture of a urea-sulphur fertiliser composition, the process comprising providing feeds comprising elemental sulphur, urea, and optionally a surfactant, such as a multifunctional ionic surfactant; merging the feeds in order to obtain a combined feed; passing the combined feed through a mixing stage in order to obtain a mixed feed; and passing the mixed feed through a processing stage in order to obtain the urea-sulphur fertiliser composition. Compositions obtained by the process are also provided.

First claim

That which is claimed is:

1. A process for the manufacture of a urea-sulphur fertiliser composition, the process comprising:
(a) providing a first feed comprising elemental sulphur, and a second feed comprising urea;
(b) combining the first feed and the second feed to obtain a combined feed;
(c) passing the combined feed through at least three mixers arranged in a parallel configuration to obtain a mixed feed; and
(d) processing and forming the mixed feed to obtain a granular urea-sulphur fertiliser product comprising from 1 wt % to 40 wt % sulfur based on the total weight of the granular urea-sulphur fertiliser product.

2. The process of claim 1 , wherein the mixers are selected from the group consisting of a static mixer and a dispersion mill.

3. The process of claim 2 , wherein step (a) comprises providing a third feed that comprises a multifunctional ionic surfactant.

4. The process of claim 3 , wherein the mixers are selected from the group consisting of a static mixer and a dispersion mill.

5. The process of claim 1 , wherein the process further comprises: adding one or more plant micronutrients to the combined feed or mixed feed, wherein the plant micronutrients are one or more selected from the group consisting of boron; selenium; sodium; zinc; manganese; iron; copper; molybdenum; cobalt; calcium; and magnesium.

6. The process of claim 5 , wherein the first feed is in liquid form and the second feed is in liquid form.

7. A process for the manufacture of a urea-sulphur fertiliser composition, the process comprising:
(a) providing a first feed comprising elemental sulphur, and a second feed comprising urea;
(b) combining the first feed and the second feed to obtain a combined feed;
(c) passing the combined feed through at least three mixers arranged in a series configuration to obtain a mixed feed; and
(d) processing and forming the mixed feed to obtain a granular urea-sulphur fertiliser product.

Assignees

• Shell Oil Co

Inventors

• Allais Cyrille Paul
• Hutter Klaas Jan
• Garcia Martinez Rafael Alberto
• Ingoldsby Charles James
• Moreira Tomaz Carlos
• O'Brien Jason Trevor

Classifications

• C05G5/12

  Granules or flakes · CPC title

• C05C9/00 Primary

  Fertilisers containing urea or urea compounds · CPC title

• C05G3/00

  Mixtures of one or more fertilisers with additives not having a specially fertilising activity · CPC title

• C05C9/005

  Post-treatment · CPC title

• C05D9/02

  containing trace elements · CPC title