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Title
A biorefinery initiative on producing dissolving pulp from dhaincha (Sesbania aculeata) plant - a short rotation crop
Authors
M. SARWAR JAHAN and M. MOSTAFIZUR RAHMAN
Received
December 13, 2011
Published
Volume 46 Issue 5-6 June-July
Keywords
Dhaincha, pre-extraction, pulp yield, viscosity, pulp brightness
Abstract
Dhaincha (Sesbania aculeata) is a short-rotation crop cultivated for its nutritional value to soil. Dhaincha chips were
pre-extracted with acidic and alkaline solutions at 165 °C for 60 min to produce dissolving pulp. The pH of the preextracted liquor reached a near-neutral value (pH 6.8), when 3% NaOH was added. Pre-extraction dissolved 17-20%
biomass from dhaincha. From the pre-extraction liquor, 1.6-2.6% lignin, 1.5-1.7% acetic acid and about 7% sugars (on
o.d. dhaincha) were extracted. Pre-extracted dhaincha was cooked by the kraft process. Pre-extraction with alkaline
solution produced higher pulp yield and lower kappa number than simple water and H2SO4-water pre-extraction. After
D0EpD1 bleaching, the pre-extracted pulp showed almost similar pulp brightness. The pulp obtained after alkaline preextraction exhibited higher pulp viscosity and higher α-cellulose content. It can be concluded that pre-extraction at
near-neutral pH produces pulp with higher yield, purity and viscosity with good brightness.
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