Method of removing sulfur dioxide from flue gases, especially power plant flue gases and flue gases from garbage incinerator plants

Patent 6063352 Issued on May 16, 2000. Estimated Expiration Date:

July 10, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3927178

Process for the removal of sulfur dioxide from gases Patent #: 4268489
Issued on: 05/19/1981
Inventor: Haese

Inventors

Assignee

Lurgi Lentjes Bischoff GmbH

Application

No. 113847 filed on 07/10/1998

US Classes:

423/243.06, Ammonium compound reactant423/547Employing sulfite or bisulfite as reactant

Examiners

Primary: Griffin, Steven P.
Assistant: Vanoy, Timothy C.

Attorney, Agent or Firm

Dubno; Herbert

Foreign Patent References

0 005 270 A1 EP. 11/12/1979
0 212 523 A2 EP. 03/12/1987
0 620 187 A1 EP. 10/12/1994
0 778 067 A1 EP. 06/12/1997
37 33 319 C2 DE. 04/12/1989
37 33 319 A1 DE. 04/12/1989
48-19472 JP 03/12/1973
52-7870 JP 01/12/1977

International Class

B01D 053/50

Foreign Application Priority Data

1997-07-19 DE

Abstract

SO2 containing flue gas is scrubbed with a scrubbing solution made up from ammonia water, untreated ammonium sulfate scrubbing solution recycled from the bottom of the scrubbing zone and ammonium sulfate solution formed by oxidizing a portion of the recovered ammonium sulfite scrubbing solution. The ammonium sulfite/ammonium sulfate mixing ratio is maintained at 15:1 to 3:1. The ammonium sulfite containing scrub liquid in combination with aqueous ammonia and an ammonium sulfate solution which has undergone oxidation can have an unusually high sulfur dioxide absorption capacity while minimizing the formation of aerosols.