Journal
BIORESOURCES
Volume 14, Issue 3, Pages 5544-5558Publisher
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.14.3.5544-5558
Keywords
Tobacco stalk; SO2-ethanol-water fractionation; Alkaline extraction; Bleaching; Dissolving pulp
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Funding
- Natural Science Foundation of Jiangsu Province [BK20180772]
- National Natural Science Foundation of China [31800501]
- R. J. Reynolds Tobacco Company (Winston-Salem, NC, USA)
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The objective of this study was to evaluate the possibility of producing dissolving grade pulp from tobacco stalk through combining SO2-ethanol-water (SEW) fractionation, alkaline extraction, and bleaching with oxygen (O), chlorine dioxide (D), alkaline extraction with hydrogen peroxide (Ep), and hydrogen peroxide (P) (OD0(Ep)D1P). The results showed that the optimum SEW cooking condition to remove the original xylan and lignin in tobacco stalk to an acceptable level was 6% SO2 charge (by weight) at 135 degrees C for 180 min. A bleachable pulp (Kappa number of 21.5) was produced from the SEW-treated tobacco stalk via a subsequent 1% NaOH extraction. After the OD0(Ep) D1P sequence bleaching, the bleached pulp showed a high brightness (88.1% ISO) and a high a-cellulose content (94.9%). The viscosity (15.8 cP) and the residual xylan content (4.4%) of the pulp were within acceptable levels for dissolving pulp production. Thus, tobacco stalk was shown to be a viable raw material for dissolving pulp production following a SEW treatment, alkaline extraction, and a conventional bleaching sequence.
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