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Catalytic Removal of Sulfur Dioxide from Flue Gas

Summary

Flue gases produced in combustion processes, such as coal-fired power plants, automobiles, smelters, etc., contains huge amount of nitrogen and sulfur oxides, carbon monoxide and particulates. They contribute significantly to atmospheric pollution and some of them are stringently controlled by legistration. Although there are many methods to convert nitrogen and sulfur oxides in flue gases into environmentally compatible products, none of these methods can convert both gases into products in a single reactor simultaneously.

The invention provides a new process, which reduce nitrogen and sulfur oxides by carbonyl sulfide over suitable catalysts to nitrogen and high purity elemental sulfur at low temperature. Lowering the reaction temperature of the reactions has enormous advantages in terms of savings in capital investment and operational costs. The process is novel and single-stage. It can apply in the simultaneous, dry and catalytic conversion of sulfur dioxide and nitrogen oxides from gases produced in combustion process into environmentally compatible products and saleable elemental sulfur.

Technology Benefits

1. One-step desulfurization and nitrogen oxide abatement (deNOx) process
2. Effective and efficient
3. Simple in design and construction
4. Low building cost
5. Generate saleable sulfur

Technology Application

- Power plants
- Automobiles
- Smelters
- Combustion plants

Supplementary Information

Patent Number: US5853684A
Application Number: US1997914615A
Inventor: Fang, Ming | Ma, Jian Xin
Priority Date: 14 Nov 1995
Priority Number: US5853684A
Application Date: 21 Aug 1997
Publication Date: 29 Dec 1998
IPC Current: B01D005386
US Class: 4232441 | 4232391 | 42324402 | 42324406 | 42324409
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Catalytic removal of sulfur dioxide from flue gas
Usefulness: Catalytic removal of sulfur dioxide from flue gas
Summary: USE For removal of sulphur dioxide and nitrogen oxides from a gas stream e.g. flue gases.
Novelty: Single stage removal of sulphur di:oxide and nitrogen oxide(s) from a flue gas stream by contacting with a reducing gas stream in a catalytic reactor containing a lanthanum thio:oxide containing catalyst bed

Industry

Chemical/Material

Sub Group

Chemical/Material Application

Application Date

21 Aug 1997

Application No.

US 08/914615

Patent Information

US 5853684

ID No.

TTC.PA.028

Country/Region

Hong Kong

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