Gasification of black liquor

Patent · Tue Jul 28 00:00:00 EDT 1987

OSTI ID:866319

Kohl, Arthur L ^[1]

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1. Woodland Hills, CA

A concentrated aqueous black liquor containing carbonaceous material and alkali metal sulfur compounds is treated in a gasifier vessel containing a relatively shallow molten salt pool at its bottom to form a combustible gas and a sulfide-rich melt. The gasifier vessel, which is preferably pressurized, has a black liquor drying zone at its upper part, a black liquor solids gasification zone located below the drying zone, and a molten salt sulfur reduction zone which comprises the molten salt pool. A first portion of an oxygen-containing gas is introduced into the gas space in the gasification zone immediatley above the molten salt pool. The remainder of the oxygen-containing gas is introduced into the molten salt pool in an amount sufficient to cause gasification of carbonaceous material entering the pool from the gasification zone but not sufficient to create oxidizing conditions in the pool. The total amount of the oxygen-containing gas introduced both above the pool and into the pool constitutes between 25 and 55% of the amount required for complete combustion of the black liquor feed. A combustible gas is withdrawn from an upper portion of the drying zone, and a melt in which the sulfur content is predominantly in the form of alkali metal sulfide is withdrawn from the molten salt sulfur reduction zone.

• Research Organization: Champion International Corp
• DOE Contract Number: AC05-80CS40341
• Assignee: Rockwell International Corporation (El Segundo, CA)
• Patent Number(s): US 4682985
• Application Number: 06/779,321
• OSTI ID: 866319
• Country of Publication: United States
• Language: English

Related Subjects

/48/162/423/
25
55
alkali
alkali metal
amount
amount required
amount sufficient
aqueous
below
black
black liquor
bottom
carbonaceous
carbonaceous material
combustible
combustible gas
combustion
complete
complete combustion
compounds
comprises
concentrated
concentrated aqueous
conditions
constitutes
containing
containing carbon
containing carbonaceous
containing gas
content
create
drying
entering
feed
form
gas
gas introduced
gasification
gasification zone
gasifier
immediatley
introduced
liquor
liquor containing
located
located below
material
melt
metal
metal sulfide
molten
molten salt
oxidizing
oxidizing conditions
oxygen-containing
oxygen-containing gas
pool
portion
predominantly
preferably
preferably pressurized
pressurized
reduction
reduction zone
relatively
relatively shallow
remainder
required
salt
shallow
solids
space
sufficient
sulfide
sulfide-rich
sulfur
sulfur compound
sulfur compounds
sulfur content
total
total amount
treated
upper
upper portion
vessel
vessel containing
withdrawn
zone
zone located