Process for the preparation of delignified and bleached chemical paper pulps

摘要

PCT No. PCT/FR95/00494 Sec. 371 Date Jan. 17, 1997 Sec. 102(e) Date Jan. 17, 1997 PCT Filed Apr. 14, 1995 PCT Pub. No. WO95/31599 PCT Pub. Date Nov. 23, 1995A process of dignifying lignocellulosic pulp with oxygen followed by treatment of the delignified pulp with a chelating agent, followed by washing, followed by treatment with hydrogen peroxide at an alkaline pH in the presence of an alkali metal silicate at a temperature greater than 100 DEG C. and a pressure greater than 1.5 times the saturated vapor pressure.