Method and apparatus for concentrating black liquor

Details Method and apparatus for concentrating black liquor Method and apparatus for concentrating black liquor

D - Textiles, Paper

21

C

9/37, 9/36.7

D21C 11/00 (2006.01) B01D 1/14 (2006.01) D21C 11/10 (2006.01)

Patent

CA 1267506

A METHOD AND APPARATUS FOR CONCENTRATING BLACK LIQUOR Abstract of the Disclosure: A method and apparatus are disclosed for concentrat- ing an alkaline waste liquor containing sulfur compounds, the so-called black liquor, which is discharged from a step of Kraft-cooking wood fibers, in order to recover the cook- ing chemicals from said waste liquor, characterized in that CO2 gas and/or a gas containing CO2 gas is added to said waste liquor as a boiling-point-lowering agent, viscosity- lowering agent and solidification promoter, after a step of oxidizing said waste liquor and in or prior to one or more stages during the step of concentrating said waste liquor.

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