Disposal of sulfur oxide pollutant-containing gas

US4081513A · kind A · utility

Assignee

• United States of America as represented by the Administrator of the U.S. Environmental Protection Agency · US

Inventor

• Gerald Moss · West Sand Lake, US

Key dates

• Filing date: Dec 9, 1975
• Grant date: Mar 28, 1978
• Expiry date: Dec 9, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/501
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A pollutant such as SO.sub.2 is removed from a pollutant-containing gas stream by passing the stream to a drying zone to which a solution and/or dispersion of pollutant-reactive material (such as CaO) is supplied, the drying zone operating to evaporate the liquid (e.g. water) and at least some pollutant reacting with the material to form an innocuous disposable solid which is removed, the pollutant-depleted gas stream being scrubbed in a scrubbing zone by a solution and/or dispersion of pollutant-reactive material to form substantially pollutant-free gas which is vented to atmosphere, the solution and/or dispersion being recovered from the scrubbing zone, some being recirculated back to the scrubbing zone after the addition of required make-up liquid and/or pollutant-reactive material, and some being passed to the drying zone preferably after concentrating the pollutant-reactive material therein. Preferably, the drying zone is a bed of solids fluidized by the incoming hot pollutant-containing gas stream.