Method of recovering chemical from spent pulp liquors

Details Method of recovering chemical from spent pulp liquors Method of recovering chemical from spent pulp liquors

1988-06-10

1990-04-17

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 3011, 162 31, 423DIG10, 422185, 110165R, 110259, D21C 1114

Patent

active

049177630

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.

REFERENCES:
patent: 3163495 (1964-12-01), Greenawalt
patent: 3323858 (1967-06-01), Guerrieri
patent: 4601786 (1986-07-01), Santen et al.

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