Investigation on the Influence of the Alkaline Preextraction of Hemicelluloses on the Properties of Rice Straw Soda-AQ Pulp

Document Type : Research Paper

Authors

1 MSc Student, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran.

2 Assistant Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran.

3 Assistant Professor, Department of, Wood and Paper Science and Technology Faculty of Agriculture and Natural Resources, Gonbad Kavous University

Abstract

The effect of partial pre-extraction of hemicelluloses on the properties of rice straw soda-AQ pulp to produce
valuable by products from this pre-extraction was investigated. The pre-extraction conditions were conducted
using 10% sodium hydroxide (based on dry weight of the rice straw), at 50 °C for 90 minutes to reach the
extraction rate of 48.1% of the hemicelluloses. Soda-AQ pulping was performed under different conditions at
pre-determined pulping time and liquor to straw ratios. The optimum pulping conditions was found as 14%
active alkali, 160 °C and 45 minutes pulping time. Comparasion of per-extracted materials with the normal rice
straw indicated that to achieve the same kappa number and yield, the pretreated material requires less alkali and
cooking time. The results showed that pre-extraction marginally reduced the tensile strength index of the pulp
which the difference was not statistically significant with control pulping condition. However, the burst strength
index of pre-extracted pulp and control was identical. The overall mechanical properties of pretreated pulp were
the same as the control.

Keywords


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