B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/34 (2006.01) D21C 3/02 (2006.01) D21C 3/26 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01)
Patent
CA 2060819
26 ABSTRACT Gases containing water vapor and over 10% (e.g. about 15-80%) by weight organic sulfur compounds, such as off gases from a kraft or sulfite digester, black liquor evaporator, or apparatus for heating black liquor to reduce its viscosity, are converted into a gas stream comprising primarily hydrogen sulfide and methane. Hydrogen can be added to the gas, and the gas in the presence of the added hydrogen may be passed past a hydrogen desulfurization catalyst (nickel or cobalt molybdenum). Preferably the vast majority of the water vapor is removed before it is passed past the catalyst. The hydrogen source may be provided by the gas itself, by passing a portion through a methane/steam reformer and separating hydrogen from the stream, to produce a gas containing primarily methane and carbon dioxide which is used for a combustion gas. Hydrogen sulfide may be removed from the gas stream by passing it into contact with white or green liquor from kraft paper pulping processes. Alternatively, substochiometric combustion of at least some of the gas may be effected, and after soot removal the gas may be passed into contact with a dirty shift catalyst (an alumina catalyst containing oxides of cobalt and molybdenum) to produce a gas stream comprising primarily hydrogen sulfide and methane with some carbon dioxide.
Bereskin & Parr
Kamyr Inc.
LandOfFree
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