Method of recovering chemicals from spent pulp liquors

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

D - Textiles, Paper

21

C

9/36.2

D21C 11/12 (2006.01)

Patent

CA 1264506

ABSTRACT OF THE DISCLOSURE 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, external thermal energy independent of combustion being simultaneously supplied to the reaction zone of the reactor, after which the resultant melt is separated at substantially the temperature prevailing at combustion, the gaseous product thereby formed being quenched in a quenching and cooling zone, to a temperature below 950°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 Na2CO3 content.

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