Characterization of Dogs Tooth Grass and its Delignification by Soda Pulping Process

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Author(s) Dharm Dutt | Arvind Kumar Sharma | Swarnima Agnihotri | Archana Gautam1
Pages 434-447
Volume 1
Issue 8
Date August, 2012
Keywords Chenopodium album, Anatomy, Morphology, Proximate chemical analysis, Soda pulping.

Chenopodium album, commonly known as dogs tooth grass, belongs to order Caryophyllales, family Amaranthaceae and is an interesting example of Eudicotyledons. Anatomy of C. album shows that the cells between vascular bundles become thickened and lignified together with the xylem and form a compact body of cylinder known as conjunctive tissue, which is an important hitherto unexploited source of cellulosic fibers at a time when most of the nations were searching new alternatives due to shrinking of forest resources. Fibers of C. album are short, libriform type, pointed with pitted walls and produce a bulky and opaque paper which is the most important property for writing and printing grade due to high Luce's shape factor, slenderness ratio, solid factor and Runkel ratio. Moderate amount of extractives with higher holocellulose contents (70.2%) and a-cellulose (39.7%) make C. album as promising raw materials for pulp and paper production. C. album contains medium lignin contents (21.5%). Therefore, it requires milder cooking conditions and can be cooked as a supplement raw material with other non-woody plants. C. album produces a screened pulp yield of 42.3% of kappa number 19.5 at an active alkali dose of 20% (as NaOH), time at 1650C temperature 90 min and liquor to wood ratio of 4.5:1 by soda pulping process. Addition of 0.1% anthraquinone at optimum pulping conditions improves pulp yield marginally and reduces kappa number 2.3 units. C. album produces optimal strength properties at 40+1 0SR. The reaction kinetics study indicates that delignification is of first order.

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