公开(公告)号：EP1702101A1

公开(公告)日：2006-09-20

申请号：EP04805227.8

申请日：2004-12-22

申请人： Metso Paper, Inc.(Reg.No. 763281)

发明人： MARTIKAINEN, Seppo ,  TIKKA, Panu ,  TIMONEN, Olli ,  SVEDMAN, Mikael

IPC分类号： D21C1/06 ,  D21C3/02 ,  D21C3/22

CPC分类号： D21C1/06 ,  D21C3/02 ,  D21C3/222 ,  D21C3/26 ,  D21C11/0021

摘要： According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added intermixed with the first liquor charged to the digester, or as a separate charge before the impregnation liquor is introduced. Preferably, a cooking catalyst, e.g. antraquinone, is added to the white liquor charge as the cooking stage commences.