公开(公告)号：EP0279845A4

公开(公告)日：1991-01-09

申请号：EP87905881

申请日：1987-08-25

申请人： JAMES RIVER-NORWALK, INC.

发明人： ROGERS, JOHN, K. ,  BAYSDEN, RONALD, K.

IPC分类号： D21C9/14 ,  D21C9/147

CPC分类号： D21C9/144

摘要： A multistage pump bleaching process comprising at least three bleaching stages including oxygen extraction (20) in an alkaline medium (EO) of a chlorine (C) or chlorine/chlorine-dioxide (CD) bleaching step (5) followed by a hot alkaline hypochlorite treatment (H*/E), (28) or followed by a chlorine dioxide (D) treatment with simultaneous treatment with chlorine dioxide (H*/ED) in the sequence EOH*/ED or EO(H*/ED). The novel bleaching sequences result in significant savings in time and operating costs as compared with conventional bleaching sequences capable of producing products of comparable brightness.