Method for recovering sodium from a spent cooking liquor

Details Method for recovering sodium from a spent cooking liquor Method for recovering sodium from a spent cooking liquor

1993-11-29

1997-01-28

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 3011, 423DIG3, D21C 1106, D21C 1110, D21C 1112

Patent

active

055974457

ABSTRACT:
A method for recovering sodium from a spent cooking liquor used in a kraft pulping process employing sodium hydroxide as a cooking agent resulting in the presence of sodium and sulfur combined with various elements in the spent cooking liquor. Black liquor is converted to green liquor, and the green liquor is reacted with lime in a causticizer to produce caustic and calcium carbonate. The caustic is recovered for use as a cooking liquor and the calcium carbonate is heated in a lime kiln to provide a source of lime. Flue gases containing free lime evolved from the lime kiln are contacted with a sodium carbonate solution in a scrubber to convert lime to caustic.

REFERENCES:
patent: 3153609 (1964-10-01), Markant et al.
patent: 3554858 (1971-01-01), Timpe
patent: 3617434 (1971-11-01), Nakafuri et al.
patent: 3650889 (1972-03-01), Fogman et al.
patent: 4431617 (1984-02-01), Farin
patent: 5284550 (1994-02-01), Tanca et al.

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