专利检索 ap:("QILU UNIVERSITY OF TECHNOLOGY") AND inv:"Kai ZHANG" 第 1 页

1.

发明公开
SHORT-SEQUENCE ECF BLEACHING PROCESS X/Z/D-EOP-D OR X/D/Z-EOP-D FOR KRAFT WOOD PULP 审中-公开

公开(公告)号：US20230349098A1

公开(公告)日：2023-11-02

申请号：US18014129

申请日：2021-08-05

申请人： QILU UNIVERSITY OF TECHNOLOGY

发明人： Jiachuan CHEN , Guihua YANG , Kai ZHANG , Zhongjian TIAN , Xingxiang JI , Gaojin LYU , Qichao GAO

IPC分类号： D21C9/153 , D21C9/10 , D21C9/16 , D21C9/14 , D21H11/04

CPC分类号： D21C9/153 , D21C9/1057 , D21C9/163 , D21C9/14 , D21H11/04

摘要： The present disclosure belongs to the technical field of papermaking, and specifically relates to a short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D for kraft wood pulp, comprising the following steps: (1) sequential bleaching (X/Z/D or X/D/Z): subjecting an oxygen delignified wood pulp to X/Z/D1 or X/D1/Z sequential bleaching to prepare a semi-bleached pulp; (2) reinforced alkaline extraction treatment (EOP): performing hydrogen peroxide and oxygen enhanced alkaline extraction treatment on the pulp after sequential bleaching to further dissolve the residual lignin in the pulp; (3) supplemental bleaching (D): performing a chlorine dioxide supplemental bleaching on the pulp after the enhanced alkaline extraction treatment to obtain a fully bleached pulp (88% ISO).