D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/56
D21C 7/00 (2006.01) D21C 3/22 (2006.01) D21C 7/10 (2006.01)
Patent
CA 1222898
ABSTRACT OF THE DISCLOSURE A process is provided herein for the continuous digestion at elevated temperatures of finely-divided material, e.g. wood chips. The digestion takes place while passing the finely-divided material through a heating zone having an inlet end and an outlet end, then passing the finely- divided material through one or more digesting zones, each having an inlet end and an outlet end, and then passing the finely-divided material through a cooling zone, having an inlet and and an outlet end, in contact with a liquid phase. The improved digestion procedure includes first feeding a mixture of fresh digesting liquor and the finely-divided material into, and with- drawing a selected amount of a liquid phase from, the inlet end of the heating zone, the feeding and withdrawing being in such relative quantities that their heat-capacity flows are of substantially the same order of magnitude. Spent hot liquid phase withdrawn is then withdrawn from outlet end of the one or more digesting zones. At least a part of the liquid phase withdrawn from the inlet end of the heating zone is brought into indirect counter-current heat-exchange contact with the spent hot withdrawn liquid phase, the relative quantities of the withdrawn selected amount of liquid phase and the withdrawn spent hot liquid phase being such that the heat-capacity flows of the two liquid phases are of substantailly the same order of magnitude. Finally cold displacement liquor is fed into the outlet end of the cooling zone, the net quantity of the cold displacement liquor fed being such that the heat- capacity flow is substantially of the same order of magnitude as the heat capacity flow of the digesting material and the liquid content thereof which has been withdrawn from the outlet end of the cooling zone.
418727
Borden Ladner Gervais Llp
Ekono Oy
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