Method and apparatus for deactivating spent liquor

Details Method and apparatus for deactivating spent liquor Method and apparatus for deactivating spent liquor

1986-05-29

1988-07-05

Bashore, S. Leon

Concentrating evaporators

Processes

Involving waste liquid

159 23, 159 18, 159 201, 159DIG8, 202174, 2021852, 203 88, 162 46, 162 47, B01D 126, B01D 306

Patent

active

047552581

ABSTRACT:
Calcium containing sulphate spent liquor is deactivated by means of heating. Spent liquor is heated by means of direct condensing in a flash-steam-system. Liquor vapors generated during expansion of the already deactivated spent liquor are used for heating the spent liquor. Spent liquor is led to a retention tank through n+1 in series connected direct condensers (DK I-DK V) and from the retention tank through n in series connected flash tanks (FT I-FT IV) disposed counter-currently to the direct condensers. In the last one of the direct condensers (DK V) the liquor is heated by means of externally supplied steam; in all others (DK I-DK IV) by means of expansion vapor.

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Thomas M. Grace, "Evaporator Scaling", Southern Pulp and Paper Manufacturers, Aug. 1977, pp. 16, 17, 20, 22 and 23.

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