HYDROGEN PEROXIDE AND SODIUM CHLORITE BLEACHING OF SULPHATE PULP
Abstract
The scheme Pa – E – Ch1 – EP – Ch2 is including delignification of pulp with hydrogen peroxide under acidic conditions in the presence of a molybdenum catalyst (Pa stage) and sodium chlorite bleaching under acidic conditions (Ch1 and Ch2 stages). This scheme simplifies bleach technology of sulphate pulp because stages O and D are excluded. Degrees of oxidising and hydrolitic degradation of cellulose, regularity of change physical and chemical, structural and morphological properties of the pulp produced during Pa – E – Ch1 – EP – Ch2 scheme was determined. Bleaching of sulphate pulp with Kappa number 33,6 under the developed optimum conditions allows to receive pulp with a whiteness 88,0% and high level of mechanical strength.
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