Method of treating an off-gas stream and an apparatus therefor

B - Operations – Transporting – 01 – D

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

B01D 53/14 (2006.01) B01D 53/50 (2006.01) B01D 53/52 (2006.01) B01D 53/75 (2006.01) C02F 3/02 (2006.01) C10K 1/12 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2757684

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 oxidise 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, 876a) 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-oxidising bacteria in the presence of oxygen to biologically oxidise sulphite and bisulphite to sulphate to provide a sulphate stream (910).

La présente invention porte sur un procédé de traitement d'un courant de gaz d'échappement (80) comprenant NH3 et H2S pour obtenir un courant de sulfate (910). Le procédé comprend les étapes consistant à : i) se procurer un premier courant de gaz d'échappement (80) comprenant NH3, H2S, CO2 et facultativement un ou plusieurs parmi HCN, COS, et CS2 ; (ii) faire passer le premier courant de gaz d'échappement (80) dans un incinérateur (300) pour oxyder NH3, H2S, et facultativement un ou plusieurs parmi HCN, COS et CS2, afin d'obtenir un second courant de gaz d'échappement (310) comprenant N2, H2O, SO2 et CO2 ; iii) épurer le second courant de gaz d'échappement (310) avec un premier courant alcalin aqueux (380, 876a) dans un épurateur caustique (350) pour séparer SO2 et une partie du CO2 provenant du second courant de gaz d'échappement afin d'obtenir un courant caustique usé (360) comprenant du carbonate et un ou deux parmi le sulfite et le bisulfite et un courant de gaz d'échappement d'épurateur caustique (370) comprenant N2 et CO2 ; et (iv) faire passer le courant caustique usé (360) dans un aérateur (900) comprenant des bactéries d'oxydation du soufre en présence d'oxygène pour oxyder biologiquement le sulfite et le bisulfite en sulfate pour obtenir un courant de sulfate (910).

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method of treating an off-gas stream and an apparatus therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of treating an off-gas stream and an apparatus therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of treating an off-gas stream and an apparatus therefor will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1879518

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.