Process for removing SO3/H2SO4 from flue gases

US6803025B2 · kind B2 · utility

Inventors

• Frank B. Meserole · Austin, US
• Robert E. Moser · Palo Alto, US
• James H. Wilhelm · Sandy, US

Key dates

• Filing date: Dec 5, 2002
• Grant date: Oct 12, 2004
• Expiry date: May 14, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/505
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process of using sodium carbonate and sodium bicarbonate solutions to remove SO3 and other acidic gases or vapors from a flue gas without substantially decreasing the amount of sulfur dioxide also present in the flue gas. Very limited quantities of such solutions are injected into the flue gas in a manner that achieves a controlled droplet size, such that the solution dries on contact with the flue gas and the resulting dry particles of sodium carbonate/bicarbonate are sufficiently small as to have adequate surface area for reacting with SO3, as well as any H2SO4 and, to some extent, HCl vapors in the flue gas.