METHODS AND SYSTEMS FOR THE USE OF RECYCLED FILTRATE IN BLEACHING PULP

摘要

A system for the bleaching of lignocellulosic pulp including: a first oxygen reactor and a second oxygen reactor connected in series to the first oxygen reactor, wherein each reactor bleaches the pulp; an upstream pulp washer that washes pulp and discharges washed pulp to a first pulp conduit having an outlet coupled to the first oxygen reactor; an oxygen supply conduit connected to the first pulp conduit and supplying oxygen to the washed pulp flowing through the first pulp conduit; a downstream pulp washer that washes bleached pulp discharged from the second oxygen reactor; a filtrate conduit receiving filtrate discharged from the downstream pulp washer; a second pulp conduit receiving bleaches pulp discharged from the first oxygen reactor and conveying the bleached pulp to the second oxygen reactor, wherein the filtrate conduit is connected to the second pulp conduit such that at least a portion of the filtrate in the filtrate conduit flows into the second pulp conduit, and a second oxygen supply conduit connected to the second pulp conduit and introducing oxygen to the pulp flowing through the conduit.