Last Updated: August 9, 2026

Claims for Patent: 8,765,451

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Summary for Patent: 8,765,451

Title:	Method of treating an off-gas stream and an apparatus therefor
Abstract:	The present invention provides a method of treating an off-gas stream (80) comprising NH3 and H2S to provide a sulphate stream (910), the method comprising the steps of: (i) providing a first off-gas stream (80) comprising NH3, H2S, CO2 and optionally one or more of HCN, COS and CS2; (ii) passing the first off-gas stream (80) to an incinerator (300) to oxidize NH3, H2S, and optionally one or more of HCN, COS and CS2 to provide a second off-gas stream (310) comprising N2, H2O, SO2 and CO2; (iii) scrubbing the second off-gas stream (310) with a first aqueous alkaline stream (380, 876 a) in a caustic scrubber (350) to separate SO2 and a part of the CO2 from the second off-gas stream to provide a spent caustic stream (360) comprising carbonate and one or both of sulphite and bisulphite and a caustic scrubber off-gas stream (370) comprising N2 and CO2; and (iv) passing the spent caustic stream (360) to an aerator (900) comprising sulphur-oxidizing bacteria in the presence of oxygen to biologically oxidize sulphite and bisulphite to sulphate to provide a sulphate stream (910).
Inventor(s):	Sandra Schreuder
Assignee:	Shell USA Inc
Application Number:	US13/263,146

Details for Patent 8,765,451

Glossary

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Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Bluebird Bio Inc.	SKYSONA	elivaldogene autotemcel	Injection	125755	September 16, 2022	8,765,451	2030-04-06
>Applicant	>Tradename	>Biologic Ingredient	>Dosage Form	>BLA	>Approval Date	>Patent No.	>Expiredate

International Patent Family for US Patent 8,765,451

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Country	Patent Number	Estimated Expiration
World Intellectual Property Organization (WIPO)	2010115871	⤷ Start Trial
United States of America	2012058545	⤷ Start Trial
South Korea	20120008523	⤷ Start Trial
>Country	>Patent Number	>Estimated Expiration

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