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Title: Gasification of black liquor

Abstract

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 immediately 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 A combustible gas is withdrawn from an upper portion of the drying zone, and a melt in which the sulfur content is predominantly in themore » form of alkali metal sulfide is withdrawn from the molten salt sulfur reduction zone. 2 figs.« less

Inventors:
Issue Date:
Research Org.:
Champion International Corp
OSTI Identifier:
7012355
Patent Number(s):
4682985 A
Application Number:
PPN: US 6-779321
Assignee:
Rockwell International Corp., El Segundo, CA (United States) ORO; EDB-94-121945
DOE Contract Number:  
AC05-80CS40341
Resource Type:
Patent
Resource Relation:
Patent File Date: 23 Sep 1985
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; GAS GENERATORS; DESIGN; SPENT LIQUORS; GASIFICATION; DESULFURIZATION; GAS FUELS; MOLTEN SALTS; OPERATION; CHEMICAL REACTIONS; FUELS; INDUSTRIAL WASTES; LIQUID WASTES; SALTS; THERMOCHEMICAL PROCESSES; WASTES; 090900* - Biomass Fuels- Processing- (1990-)

Citation Formats

Kohl, A.L. Gasification of black liquor. United States: N. p., 1987. Web.
Kohl, A.L. Gasification of black liquor. United States.
Kohl, A.L. Tue . "Gasification of black liquor". United States.
@article{osti_7012355,
title = {Gasification of black liquor},
author = {Kohl, A.L.},
abstractNote = {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 immediately 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. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {7}
}