Process for removing contaminants from gas streams
AssigneeLinde Aktiengesellschaft
InventorsNaresh Suchak, Steven Joseph Finley, Joseph A. Eschbach, Robert Zeiss
Life of this patent
Estimating the term…
Abstract
The present invention provides for process for inhibiting the levels of nitrogen oxides in process gas streams from sulfuric acid regeneration and production plants. The process gas stream from the waste heat boiler and the candle mist eliminator is contacted with ozone which will react with nitrogen oxides present in the flue gas.
Claims35
A method for removing contaminants from a waste gas stream in a sulfuric acid production process comprising the steps:
- a) contacting said waste gas stream with ozone;
- b) directing said waste gas stream to a particulate scrubber;
- c) directing said waste gas stream to a gas dryer;
- and
- d) recovering said waste gas stream.
A method for removing contaminants from a gas stream from a candle mist eliminator in a sulfuric acid production process comprising the steps:
- a) contacting said gas stream with ozone;
- b) directing said gas stream to an environmental scrubber;
- and
- c) recovering said gas stream.
A method for producing sulfuric acid comprising the steps:
- a) recovering a gas stream from a sulfuric acid recovery furnace;
- b) directing said gas stream to a particulate scrubber;
- c) injecting ozone into said gas stream prior to it entering said particulate scrubber;
- d) directing said scrubbed gas stream to a gas drying tower;
- e) directing said dried, scrubbed gas stream to a catalyst bed to convert sulfur dioxide present in said dried, scrubbed gas stream to sulfur trioxide;
- f) directing said gas stream containing sulfur trioxide to a sulfuric acid absorption tower;
- and
- g) recovering sulfuric acid.
Dependencies are inferred from the claim text.