Process for reducing oxygen consumption in black liquor oxidatio

Details Process for reducing oxygen consumption in black liquor oxidatio Process for reducing oxygen consumption in black liquor oxidatio

1980-05-12

1982-02-02

Kratz, Peter F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

159 47WL, 162 47, 162 51, 210758, 423206R, 423DIG3, D21C 1110, D21C 1114

Patent

active

043137881

ABSTRACT:
High heat recovery and minimized oxygen requirement for oxidation of sulfur compounds in black liquor is obtained by integrating the oxidation into the multiple effect evaporation system of the pulp mill recovery sequence. The oxidation step is carried out at an intermediate stage in the multiple effect concentration of weak black liquor in counterflow to the external heat input, and the thus oxidized liquor is then further concentrated by flow through the remaining effects of the system co-currently with the direction of heat flow.

REFERENCES:
patent: 3807479 (1974-04-01), Brannland et al.
patent: 4239589 (1980-12-01), Elton et al.

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