Process for the removal of particulate matter from an aqueous stream
AssigneeTopsoe A/S
InventorsMads Lykke, Lars Piilmann Brorholt, Per Aggerholm Sørensen
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Abstract
Process for the removal of particulate matter from an aqueous stream containing a concentrated acid, preferably concentrated sulfuric acid, the process including mechanical filtration by passing the aqueous stream through a filter unit, the filter unit including a metallic, ceramic or polymeric filter, or a filter including a filter aid on a septum. The aqueous stream is the exit stream of a sulfuric acid condenser, optionally the exit stream of a sulfuric acid concentrator arranged downstream the sulfuric acid condenser.
Claims17
A process for the removal of particulate matter from an aqueous stream containing sulfuric acid, wherein an average particle size of said particulate matter is in the range 0.05-10 μm, and a concentration of the sulfuric acid in said aqueous stream is above 60% wt., said process comprising:
- mechanical filtration by passing said aqueous stream through a filter unit, said filter unit comprising a metallic, ceramic, or polymeric filter, or a filter comprising a filter aid on a septum, wherein the aqueous stream is the exit stream of a sulfuric acid condenser, optionally the exit stream of a sulfuric acid concentrator arranged downstream the sulfuric acid condenser, of a process plant for producing sulfuric acid from a process gas stream, said process gas stream containing sulfur and said particulate matter,
- said process plant including:
- converting the sulfur in the form of SO2 of said process gas stream into a SO3-rich gas stream in a SO2-conversion unit, said SO2-conversion unit comprising a catalyst bed and passing said process gas stream through said catalyst bed;
- converting the SO3-rich gas stream into said exit stream of said sulfuric acid condenser, optionally said exit stream of said sulfuric acid concentrator;
- and
- optionally providing an acid cooling step for reducing the temperature of said exit stream.
A process comprising:
- (a) producing an aqueous stream comprising sulfuric acid and particulate matter from a process gas stream, the process gas stream comprising sulfur and the particulate matter, the producing comprising:
- (i) passing the process gas stream through a SO2-conversion unit comprising a catalyst bed and converting the sulfur, in the form of SO2, of the process gas stream into a SO3-rich gas stream;
- (ii) converting the SO3-rich gas stream into an exit stream of a sulfuric acid condenser;
- (iii) optionally, passing the exit stream through a sulfuric acid concentrator;
- and
- (iv) optionally, providing an acid cooling step for reducing the temperature of the exit stream, wherein the aqueous stream is the exit stream of a sulfuric acid condenser, optionally after passing through the sulfuric acid concentrator and/or the acid cooling step,
- (b) mechanical filtering of the aqueous stream by passing the aqueous stream through a filter unit, and said filter unit comprising:
- (i) a metallic, ceramic or polymeric filter;
- or
- (ii) a filter comprising a filter aid on a septum,
- wherein an average particle size of the particulate matter is in the range 0.05-10 μm, and a concentration of the sulfuric acid in the aqueous stream is above 60% wt.
Dependencies are inferred from the claim text.