EP 0621854 A4 19950830 - METHOD AND APPARATUS FOR DESULFURIZATION OF A GAS.
Title (en)
METHOD AND APPARATUS FOR DESULFURIZATION OF A GAS.
Publication
Application
Priority
- US 9300319 W 19930113
- US 81928892 A 19920113
Abstract (en)
[origin: WO9314026A1] An alkaline earth bicarbonate is solubilized in water and contacted by a flue gas. The solubilized alkaline earth bicarbonate reacts with the SO2 in the flue gas to form an alkaline earth sulfite which readily precipitates from the water solution and is efficiently separated therefrom. In accordance with the invention, the slurry exiting the desulfurization step is subjected to a heating step which causes soluble alkaline earth bisulfite formed during the desulfurization step to convert to the insoluble sulfite. The solids are separated from the aqueous phase and subjected to thermal degradation to recover the alkaline earth oxide and SO2. The alkaline earth oxide can be recirculated and reused in the desulfurization process while the SO2, which has practical uses as a precursor in various chemical processes and therefore is of commercial value, is liquified. Thermal degradation of the solids from the desulfurization step is carried out in apparatus which includes a preheater zone, an ignition and heating chamber and a degradation zone. The thermal degradation is carried out in the presence of heated pellets which are themselves inert to the degradation reaction. Preferably, the pellets are heated in the ignition and heating chamber prior to contact with the solids from the desulfurization step.
IPC 1-7
IPC 8 full level
B01D 53/34 (2006.01); B01D 53/50 (2006.01); B01D 53/73 (2006.01); B01D 53/77 (2006.01); C01B 17/60 (2006.01); C01B 17/62 (2006.01)
CPC (source: EP)
B01D 53/501 (2013.01); B01D 53/73 (2013.01); C01B 17/60 (2013.01)
Citation (search report)
- [A] US 4014978 A 19770329 - KLEIN HERSCHEL A, et al
- See references of WO 9314026A1
Designated contracting state (EPC)
DE ES FR GB
DOCDB simple family (publication)
WO 9314026 A1 19930722; CA 2127884 A1 19940722; EP 0621854 A1 19941102; EP 0621854 A4 19950830; JP H07505603 A 19950622
DOCDB simple family (application)
US 9300319 W 19930113; CA 2127884 A 19930113; EP 93904493 A 19930113; JP 51265393 A 19930113