Method for reducing sulfur-oxide emissions from an asphalt air-blowing process
US6383464B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1996 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Sep 30, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10C3/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for substantially reducing sulfur-oxide emissions from an asphalt air-blowing process involves adding an emission-reducing additive to the asphalt prior to air-blowing, or early in the air-blowing process, and filtering the flue gases produced in the process. The emission-reducing additive includes at least one metal hydroxide, metal oxide, metal carbonate, or metal bicarbonate, where the metal is sodium, potassium, calcium, magnesium, zinc, copper, or aluminum. The filter is preferably of the fiber-bed type, and removes at least a portion of the sulfur-containing compounds via condensation. The filtered stream of flue gases is subjected to an incineration process before being passed into the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.