Soda-anthraquinone pulping of residues from oil palm industry
2010
The main objective of the present work is to evaluate the suitability of soda-AQ process for pulping EFB (empty fruit bunches), viewed as an alternative raw material for pulp and paper production. To this end, a central composite design was used to study the influence of various operational variables - temperature (155-185 °C), cooking time (30-90 min), soda concentration (10-20%), anthraquinone concentration (0-1%) and liquid/solid ratio (68) - during soda-anthraquinone cooking of EFB, on the pulp and paper sheet properties obtained. The equations relating the dependent variables (pulp and paper sheet properties, yield, Kappa number, viscosity, beating degree, tensile index, stretch, burst index, tear index and brightness) to the independent ones (temperature, cooking time, soda concentration, anthraquinone concentration and liquid/solid ratio) were established, with errors below 15%, in all cases. The Kappa number range (10.8-74.3), viscosity (282849 mL/g) and brightness (44.7-65.6%) of these ccllulosic pulp materials are not appropriate for highbrightness printing papers. Instead, the physical properties (28.65 kN/g, 2.84%, 1.98 kPam2/g, 0.54 mNm /g for tensile index, stretch, burst index and tear index, respectively) recommend the cellulosic pulp obtained from the soda-AQ process for strengthening the virgin fibre in recycled papers and also for developing certain types of packaging.
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