Heat recovery in black liquor oxidation

Details Heat recovery in black liquor oxidation Heat recovery in black liquor oxidation

D - Textiles, Paper

21

C

9/36.2

D21C 11/10 (2006.01)

Patent

CA 1232712

ABSTRACT OF THE DISCLOSURE The black liquor from a kraft pulping process after intermediate concentration and prior to its introduction into the conventional recovery furnace is subjected to wet oxidation with high purity oxygen. The heat of such oxidation is used to flash the liquor to dry or semi-dry solids (80-100% solids concentration) and the resulting steam is available as process steam utilized upfitream in the evaporation sequence. The hazard of recovery boiler explosion is thus reduced or eliminated and net steam recovery is considerably improved.

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