Method for producing a fertilizer containing urea and ammonium sulphate
US7837758B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2005 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Nov 11, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00006
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after urea and ammonium sulphate (AS) is mixed and particulated. The point of integration of the ammonium sulphate production in the urea production process is chosen according to the desired product composition. The reaction is carried out in a pipe reactor where the head of the reactor enhanced the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.