Process for generating recoverable sulfur containing compounds from a spent acid stream
AssigneeRohm and Haas Company
InventorsCharles Anthony Dafft, Connie René White
Life of this patent
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Abstract
This invention relates to a process for generating recoverable sulfur containing compounds, e.g., sulfur dioxide, from a spent sulfuric acid stream by combusting and/or thermally decomposing the spent sulfuric acid stream in a furnace. The spent sulfuric acid stream is sprayed into the furnace through a spray nozzle designed to minimize the spent sulfuric acid droplet size, e.g., to produce droplets having a Sauter mean diameter of from 200 micrometers to 700 micrometers.
Claims9
A process for generating recoverable sulfur containing compounds from a spent sulfuric acid stream comprising:
- providing a spent sulfuric acid stream;
- admixing the spent sulfuric acid stream with magnesium sulfate;
- spraying the resultant spent sulfuric acid stream into a furnace through a low pressure air assisted nozzle to form an atomized spent sulfuric acid stream while combusting a fuel in the furnace thereby generating a sulfur dioxide steam from the atomized spent sulfuric acid stream.
A process for recovering acid from a spent sulfuric acid stream comprising:
- admixing magnesium sulfate with a spent sulfuric acid stream;
- spraying the resultant spent sulfuric acid stream into a furnace through a low pressure air assisted nozzle to form an atomized spent acid stream while combusting a fuel in the furnace thereby generating a sulfur dioxide stream from the atomized spent sulfuric acid stream;
- catalytically converting the sulfur dioxide to sulfur trioxide;
- and
- adsorbing the sulfur trioxide in a sulfuric acid solution of a concentration greater than 90 percent by weight of sulfuric acid to further concentrate the sulfuric acid solution.
Dependencies are inferred from the claim text.