Method of recovering chemical from spent pulp liquors
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United States of America Patent
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-
Apr 17, 1990
Issued Date -
N/A
app pub date -
Jun 10, 1988
filing date -
Oct 19, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method of recovering chemicals from spent liquors while at the same time utilizing energy liberated during the process. The spent liquors are gasified and partially disintegrated in a reactor (1), external thermal energy independent of combustion being simultaneously supplied to the reaction zone (2) of the reactor, after which the resultant melt is separated (at 9) at substantially the temperature prevailing at combustion, the gaseous product thereby formed being quenched in a quenching and cooling zone (6), to a temperature below 950.degree. C. A product gas is thus obtained which contains substantially no sulphur impurities, an alkali product with high sulphide content and an alkali product substantially free from sulphide and having low Na.sub.2 CO.sub.3 content.
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