Reduction of acid rain and ozone depletion precursors
US5645805A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Jun 19, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of reducing acid emissions and ozone deletion precursors from a flue gas produced by the combustion of sulphur-or nitrogen-containing fuel or acid emissions and ozone deletion precursors from chemical plants. The method comprises introducing into a flue containing the gas, an additive derived from the chemical reaction of pyrolysis liquor with an alkaline earth metal compound in the presence of an oxidant. This reaction produces a hydrophobic/hydrophilic mixture containing a plurality of thermolabile alkaline earth metal compounds. These compounds are able to decompose at flue gas temperature to produce an alkaline compound able to react with sulphur dioxide and oxides of nitrogen to eliminate them from the gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.