Patent ID: 6277240
Filing Date: 2001-08-21
Classification: D21C

Abstract:
A method of treating comminuted cellulosic fibrous material in a substantially upright vessel having an upper half and a lower half, comprising substantially continuously:(a) feeding a liquid slurry of comminuted cellulosic fibrous material into a top portion of the vessel;(b) withdrawing treated comminuted cellulosic fibrous material from a bottom portion of the vessel, so that the comminuted cellulosic fibrous material moves substantially continuously downwardly in the vessel; and(c) in substantially the lower half of the vessel, causing treating liquid to flow substantially horizontally into and out of contact with the comminuted cellulosic fibrous material as the comminuted cellulosic fibrous material flows downwardly in the vessel, to effect treatment of the comminuted cellulosic fibrous material substantially without interfering with the substantially continuously downward movement of the comminuted cellulosic fibrous material, including by using cooking liquor as the treating liquid at at least one location in the lower half of the vessel.