Tobacco stalks: an agricultural waste with potential as fiber resource for pulp and paper
2000
Agrupis, S.C. | Maekawa, E. | Suzuki, K. (Mariano Marcos State Univ., 2906 Batac, Ilocos Norte (Philippines))
Tobacco stalks are agricultural wastes with high potentials as raw material for pulp and paper. Regardless of the tobacco species, stalks were found to contain the major chemical constituents cellulose (42.9%), hemicellulose (29.8%), and lignin (21.0%) in comparable amount with wood species. They also contain the four distinct cell types common to hardwood namely tracheids, libriform fiber, ray parenchyma, and vessel elements with an average fiber length of 0.81-1.04 mm. Three methods of pulping were tried. Steam explosion (SE) yielded 64% pulp, soda AQ yielded 39.1%, and kraft pulping yielded 35.1%. The SE and soda AQ pulps responded well to a two stage hydrogen peroxide bleaching, giving a final brightness of 51.4 and 70.1% ISO, respectively. The conventional Cl2-NaOH-NaCl0-H2O2 (CEHP) bleaching sequence produced even higher brightness at 83%, 87.1% and 90.6% ISO for SE, soda AQ, and kraft, respectively. When refined to 300 ml Csf, the tobacco pulps showed strength properties that fared well with pulps from other raw materials. Thus, the physico-mechanical properties of the tobacco pulps prepared by SE, soda AQ and kraft pulping are very promising
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