发明公开
EP2416868A1 METHOD OF TREATING AN OFF-GAS STREAM AND AN APPARATUS THEREFOR
审中-公开
VERFAHREN ZUR BEHANDLUNG EINES ABGASSTROMS UND VORRICHTUNGDAFÜR
- 专利标题： METHOD OF TREATING AN OFF-GAS STREAM AND AN APPARATUS THEREFOR
- 专利标题（中）： VERFAHREN ZUR BEHANDLUNG EINES ABGASSTROMS UND VORRICHTUNGDAFÜR
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申请号： EP10713898.4申请日： 2010-04-06
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公开(公告)号： EP2416868A1公开(公告)日： 2012-02-15
- 发明人: SCHREUDER, Sandra
- 申请人： Shell Internationale Research Maatschappij B.V.
- 申请人地址： Carel Van Bylandtlaan 30 2596 HR The Hague NL
- 专利权人： Shell Internationale Research Maatschappij B.V.
- 当前专利权人： Shell Internationale Research Maatschappij B.V.
- 当前专利权人地址： Carel Van Bylandtlaan 30 2596 HR The Hague NL
- 代理机构： Matthezing, Robert Maarten
- 优先权： EP09157609 20090408
- 国际公布： WO2010115871 20101014
- 主分类号： B01D53/14
- IPC分类号： B01D53/14 ; B01D53/52 ; B01D53/75 ; C02F3/02 ; C10K1/12 ; C10L3/10 ; B01D53/50
摘要：
The present invention provides a method of treating an off-gas stream (80) comprising NH
3 and H
2 S to provide a sulphate stream (910), the method comprising the steps of : (i) providing a first off-gas stream (80) comprising NH
3 , H
2 S, CO
2 and optionally one or more of HCN, COS and CS
2 ; (ii) passing the first off-gas stream (80) to an incinerator (300) to oxidise NH
3 , H
2 S, and optionally one or more of HCN, COS and CS
2 to provide a second off-gas stream (310) comprising N
2 , H
2 O, SO
2 and CO
2 ; (iii) scrubbing the second off-gas stream (310) with a first aqueous alkaline stream (380, 876a) in a caustic scrubber (350) to separate SO
2 and a part of the CO
2 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 N
2 and CO
2 ; and (iv) passing the spent caustic stream (360) to an aerator (900) comprising sulphur-oxidising bacteria in the presence of oxygen to biologically oxidise sulphite and bisulphite to sulphate to provide a sulphate stream (910).
3 and H
2 S to provide a sulphate stream (910), the method comprising the steps of : (i) providing a first off-gas stream (80) comprising NH
3 , H
2 S, CO
2 and optionally one or more of HCN, COS and CS
2 ; (ii) passing the first off-gas stream (80) to an incinerator (300) to oxidise NH
3 , H
2 S, and optionally one or more of HCN, COS and CS
2 to provide a second off-gas stream (310) comprising N
2 , H
2 O, SO
2 and CO
2 ; (iii) scrubbing the second off-gas stream (310) with a first aqueous alkaline stream (380, 876a) in a caustic scrubber (350) to separate SO
2 and a part of the CO
2 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 N
2 and CO
2 ; and (iv) passing the spent caustic stream (360) to an aerator (900) comprising sulphur-oxidising bacteria in the presence of oxygen to biologically oxidise sulphite and bisulphite to sulphate to provide a sulphate stream (910).
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