Manufacture of urea sulfur fertilizer
US4330319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1981 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Jan 5, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C9/005
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for the production of a urea sulfur fertilizer by mixing urea and molten sulfur to obtain a molten mixture and solidifying the molten mixture to obtain a homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes of smaller than about 100 micron. The process comprises passing molten urea and molten sulfur through a mixing device at a temperature above the melting points to produce a finely divided sulfur dispersed in urea with the molten sulfur added in amounts sufficient to produce said urea sulfur fertilizer, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of urea sulfur, and solidifying said homogenized melt by prilling or agglomeration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.