D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/37
D21C 11/10 (2006.01) B01D 1/00 (2006.01) B01D 3/06 (2006.01) B01D 5/00 (2006.01)
Patent
CA 1276059
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.
510152
Andritz-Ahlstrom Oy
Gowling Lafleur Henderson Llp
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