Method for improving efficiency of black liquor oxidation in...

Details Method for improving efficiency of black liquor oxidation in... Method for improving efficiency of black liquor oxidation in...

D - Textiles, Paper

21

C

9/36.2

D21C 11/10 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1127804

221-P-US02345 METHOD FOR INPROVING EFFICIENCY OF BLACK LIQUOR OXIDATION IN PULP MILLS ABSTRACT OF THE DISCLOSURE High recovery of useful energy from the heat of reaction in the oxidation of black liquor is obtained by integrating the oxidation into the multiple effect evaporation system of the pulp mill recovery sequence. The heat of reaction is thereby recovers as flash steam, which when combined with the vapors from an appropriate evaporator body enables recovery of its energy through further evaporation. The oxidation reaction may be carried out the liguor leaving the second effect of the evaporation sequence for maximum energy recovery, or in accordance with an alternative embodiment, the reaction is carried out between the first effect and the flash tank with preferable addition of a second flash tank in series with the first.

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