STUDY ON FORMAMIDINE SULPHINIC ACID BLEACHING OF POPLAR APMP

摘要

Bleaching of poplar APMP with Formamidine sulphinic acid (FAS) was investigated in this paper.The effects of FAS charges, ratio of treatment on the brightness gain, color reduction and pulp strength were studied. A single-stage FAS bleaching was optimized. Under the conditions of 10 % pulp consistency, 60 minutes time and 70℃ reaction temperature and 0.6 %, FAS (on 0.d.pulp), ratio of FAS to NaOH was 2, we produced a bleached pulp with a brightness of 62.3 %(SBD), a brightness gain of 9.2 units.