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Pakistan Journal of Biological Sciences
Year: 2004  |  Volume: 7  |  Issue: 8  |  Page No.: 1327 - 1329

Bleaching of Rice Straw Pulps with Hydrogen Peroxide

Ahmet Tutus    

Abstract: In this study, 9 one-stage hydrogen peroxide bleaching trials were carried out to obtain high brightness levels in oxide added soda-oxygen-anthraquinone rice straw pulps of 52.4% (Elrepho) initial brightness. The results indicated that optimum oxide added soda-oxygen-anthraquinone rice straw pulp bleaching conditions were as follows: Hydrogen peroxide (H2O2) ratio on oven dry (o.d) pulp: 2-4%, Alkali (NaOH) charge on o.d pulp: 1.5-3%, Na2SiO3 ratio on o.d pulp: 3%, MgSO4 ratio on o.d pulp: 0.5%, EDTA ratio on o.d pulp: 0.5%, reaction temperature: 70°C, reaction time: 70 min. and concentration: 16%. Brightness, breaking length, burst and tear index of rice straw pulps bleached with H2O2 were found to be 23.32, 8.05, 10.97 and 23.69%, respectively, higher than those of unbleached rice straw pulps. Yellowness decreased from 314.85 to 218.481 elrepho.

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