Method for the combined production of a sulfur oxide containing product and a fertilizer
US8152891B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 2006 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Apr 1, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention provides a method for the combined production of (I) a sulfur oxide containing product and (II) a fertilizer selected from a group consisting of ammonium nitrate, ammonium phosphates and a combination thereof, through an indirect neutralization of ammonia with an acid selected from the group consisting of nitric acid, phosphoric acid and a combination thereof, the method comprising: a. contacting a precipitate containing calcium sulfite with a solution of nitric acid and a solution of ammonia in two separate steps, to form the fertilizer, the sulfur oxide containing product and a precipitate containing calcium hydroxide; and b. separating at least portion of the fertilizer, the sulfur oxide and the calcium hydroxide into three separated streams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.