Gas chromatographic studies of chlorophenols on the substitution of chlorine dioxide in Bamboo

Abstract

The laboratory generated spent bleach liquor from the chlorination stages of Bamboo pulp has been analysed both qualitatively and quantitatively for various chlorophenolics acids using gas chromatography. A number of chlorinated derivatives of phenols, catechols, guaiacols and syringaldehydes have been identified. The concentrations of various compounds identified have also been compared with the reported 96 LC 50 values. Elemental chlorine and chlorine compounds are commonly used in the developing countries for bleaching of pulp. The study deals with the bleaching of bamboo pulp with chlorine and chlorine dioxide (25% -100% substitution) and identification of various chlorophenolics compounds. The study has been performed by substituting 25 to 100% of chlorine by chlorine dioxide in C stage. The results show that the formation of total chlorophenolic compounds decrease substantially (82%) at 100% replacement of chlorine by chlorine dioxide in C stage.