System and process for reducing oxygen consumption in black...

Details System and process for reducing oxygen consumption in black... System and process for reducing oxygen consumption in black...

D - Textiles, Paper

21

C

9/36.2

D21C 11/12 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1159606

221-P-US02373 SYSTEM AND PROCESS FOR REDUCING OXYGEN CONSUMPTION IN BLACK LIQUOR OXIDATION ABSTRACT OF THE DISCLOSURE 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 evapora- tion 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.

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