Patent ID: 6123808
Filing Date: 2000-09-26
Classification: D21C

Abstract:
A method of treating or producing chemical pulp using a vessel having an interior surface, wherein the vessel is a digester having a top into which cellulosic fibrous material is introduced, and a bottom from which digested pulp is withdrawn; comprising the steps of:(a) causing a cellulose slurry to flow in the vessel interior in a flow path;(b) forming a substantially annular void at at least one point along the flow path, by providing a step out in the flow path;(c) introducing dilution or treatment liquor into the substantially annular void so that the liquor is substantially uniformly distributed about the periphery of or into the slurry by causing treatment or dilution liquid to flow into the substantially annular void at a plurality of openings substantially evenly spaced around the substantially annular void, so that the liquid is substantially-uniformly distributed into the slurry;(d) digesting the pulp prior to (c); andwherein (b) and (c) are practiced adjacent the bottom of the digester.