Phosphate rock scrubbing of a sulfur dixoide gas stream
AssigneeClark Solutions LLC
InventorBrian M. Burmaster
Life of this patent
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Abstract
This application is directed to the field of scrubbing a sulfur dioxide-laden gas stream by a phosphate rock solution, and then regenerating that sulfur dioxide gas via acidulation, by contacting the phosphate rock solution with sulfuric acid to regenerate a high purity sulfur dioxide stream.
Claims7
A phosphate rock solution is used to scrub a gas stream containing sulfur dioxide, capturing this sulfur dioxide in the aqueous stream.
This sulfur dioxide gas stream emanates from the tail gas stream exiting a sulfuric acid plant.
This sulfur dioxide gas stream emanates from a variety of sources, including a coal-fired power plant.
The phosphate rock solution which contains the sulfur dioxide as either sulfite or bi-sulfite ions is acidified with sulfuric acid and thus lowers the pH of solution in a controlled manner and thereby releasing sulfur dioxide as a gas stream.
This sulfur dioxide gas is then dried and compressed and enters the contact section of a sulfuric acid plant.
This highly concentrated sulfur dioxide stream can be fed to a Claus plant where elemental sulfur is produced.
As an alternate, this enriched sulfur dioxide gas stream can be admitted to a paper and pulp processing plant.
Dependencies are inferred from the claim text.