ATS tail gas treating process for SRU and SWS off gases

Details ATS tail gas treating process for SRU and SWS off gases ATS tail gas treating process for SRU and SWS off gases

2011-04-19

2011-04-19

Vanoy, Timothy C (Department: 1734)

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C423S519000, C423S576200, C423S221000, C423S243060, C422S129000, C422S186220

Reexamination Certificate

active

07927576

ABSTRACT:
The present invention relates to a system and process utilizing ammonium thio sulfate solution (ATS) as the primary liquid absorption agent that is re-circulated through an SO2 Contactor/Absorber for high efficiency contacting and absorption of sulfur dioxide, SO2from a combustion gas stream generated by incineration of a Claus Sulfur Recovery Unit (SRU) off gas stream (often referred to as a Claus tail gas stream) and also additional SO2generated from incineration of additional sulfur containing streams. ATS is also re-circulated through a separate H2S Contactor/Absorber for absorption of and reaction with a Sour Water Stripper (SWS) off gas stream and additional H2S-Acid Gas (A.G.) streams to produce additional concentrated ATS. The process and equipment also provides the ability to readily switch between using ATS and ABS as the primary absorbent solution for SO2absorption, depending upon the concentration of SO2in the off gas feed streams.

REFERENCES:
patent: 3859414 (1975-01-01), Urban
patent: 6534030 (2003-03-01), Anderson et al.
patent: 7655211 (2010-02-01), Anderson et al.
patent: 7824652 (2010-11-01), Clarkson

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