Improved method and apparatus for oxygen delignification.

摘要

An oxygen delignification method and apparatus is disclosed of the type in which fibrous materials are pumped by a thick stock pump (12) through a conduit (14) to a substantially horizontal tubular reactor tube (18) in which the fibrous materials are mixed with oxygen, steam, and an alkaline solution is improved by the introduction of oxygen to the fibrous materials as they are pumped through the conduit (14) to the horizontal reactor tube (18) and the agitation of the fibrous materials within the conduit to mix the oxygen with the materials as they flow to the reactor tube, thereby initiating an oxygen delignification reaction within the conduit and accelerating the rate of oxygen delignification of the materials within the horizontal reactor tube (18). An alkaline solution and steam are also introduced to the fibrous materials within the conduit (14) and the materials are agitated to effect mixing of the steam and alkaline chemicals with the materials. The mixing of the fibrous materials with oxygen, alkaline solution or steam is effected by an in-line, motionless mixer (44).