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Bleaching Jute with Hydrogen Peroxide
Author(s) -
Chatterjee H.,
Pal K. B.
Publication year - 1955
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1955.tb02099.x
Subject(s) - hydrogen peroxide , bleach , lignin , peroxide , chemistry , hypochlorite , chlorite , pulp and paper industry , stabiliser , organic chemistry , composite material , materials science , food science , quartz , engineering
A single‐bath process of bleaching jute with hydrogen peroxide is described with particular reference to loss of weight, lignin, and breaking strength as well as the colour of the bleached material and the composition of the residual lignin. The influence of variablesndashe.g. reaction temperature, time, bleach concentration, liquor ratio, pH, bleachability with peroxide compared with chloritendashhas been studied. Jute may be bleached white with peroxide with only a small loss of lignin, and the composition of its residual lignin remains more or less unchanged. It is believed that the point of attack by peroxide is a phenolic hydroxyl group and that the colour change is mainly due to an unknown structural modification of native lignin. A one‐volume bath of peroxide containing a stabiliser under alkaline conditions, and a 1% solution of acidified chlorite at a liquor ratio of 10: 1 and a temperature of 60–70d̀c., are suitable for bleaching jute. In both cases over 70% of the yarn strength can be maintained in the fully wet condition. The tendency of the bleached material to become yellow on storage is much less pronounced with peroxide than with hypochlorite or chlorite. The quality of such a yarn is unimpaired by long storage.