EP 0532491 A1 19930317 - Treatment of organic sulfur gases especially in kraft pulping systems and processes.
Title (en)
Treatment of organic sulfur gases especially in kraft pulping systems and processes.
Title (de)
Behandlung von organischen, schwefligem Gas, insbesonders beim Kraft-Aufschluss.
Title (fr)
Traitement de gaz contenant des composés organiques sulfurés spécialement dans des systèmes et procédés de lessivage kraft.
Publication
Application
Priority
US 75684991 A 19910910
Abstract (en)
Gases (in line 18) containing water vapor and over 10% (e.g. about 15-80%) by weight organic sulfur compounds, such as off gases (13, 20) from a kraft or sulfite digester (12), black liquor evaporator (19), or apparatus (17) for heating black liquor to reduce its viscosity, are converted into a gas stream (30) 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, in 28). Preferably the vast majority of the water vapor is removed (in dryer 27) 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 (42) 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 (in 73) of at least some of the gas may be effected, and after soot removal (in 76) the gas may be passed into contact with a dirty shift catalyst (an alumina catalyst containing oxides of cobalt and molybdenum, in 77) to produce a gas stream (79) comprising primarily hydrogen sulfide and methane with some carbon dioxide.
IPC 1-7
IPC 8 full level
B01D 53/86 (2006.01); D21C 3/02 (2006.01); D21C 3/26 (2006.01); D21C 11/00 (2006.01); D21C 11/06 (2006.01)
CPC (source: EP)
D21C 3/022 (2013.01); D21C 3/26 (2013.01); D21C 11/0064 (2013.01)
Citation (search report)
- [A] EP 0329301 A2 19890823 - ICI PLC [GB]
- [E] WO 9213994 A1 19920820 - AHLSTROEM OY [FI]
- [A] DATABASE WPIL Week 9113, Derwent Publications Ltd., London, GB; AN 91-089818
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0532491 A1 19930317; AU 1091192 A 19930311; AU 5310194 A 19940303; AU 643117 B2 19931104; BR 9201216 A 19930413; CA 2060819 A1 19930311; FI 921516 A0 19920407; FI 921516 A 19930311; JP H05237344 A 19930917; NO 920691 D0 19920221; NO 920691 L 19930311; ZA 921042 B 19921230
DOCDB simple family (application)
EP 92890034 A 19920210; AU 1091192 A 19920213; AU 5310194 A 19940111; BR 9201216 A 19920406; CA 2060819 A 19920207; FI 921516 A 19920407; JP 18706192 A 19920714; NO 920691 A 19920221; ZA 921042 A 19920213