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Title: Alkoxygen and alkoxygen-AQ delignification of <i style="">Ipomea carnea</i> and <i style="">Cannabis sativa</i>
Authors: Dutt, Dharm
Tyagi, C H
Agnihotri, Swarnima
Kumar, Alok
Keywords: <i style="">Ipomea carnea</i>
<i style="">Cannabis sativa</i>
<i style=""> </i>Alkali-O<sub>2</sub> delignification
Issue Date: Nov-2009
Publisher: CSIR
Abstract: Molecular oxygen is a specific oxidizing agent for lignin but its low solubility in cooking liquor causes a serious problem of mass transfer in a heterogeneous chemical pulping process with wood. The anatomy of <i style="">Ipomea carnea</i> and <i style="">Cannabis sativa</i> permit much easier diffusion and penetration of the molecular oxygen into the reactive zones of fiber wall. The low lignin content and more open and looser fiber structure of <i style="">I. carnea</i> and <i style="">C. sativa</i> makes them suitable for alkoxygen delignification. Due to their identical cooking conditions except liquor to wood ratio mixed cooking of <i style="">I. carnea </i>and <i style="">C. sativa</i> by alkoxygen delignification process is able to produce good quality pulp because the pulp blend has unique morphological characteristics of <i style="">I. carnea</i> which resembles with softwoods with respect to cell wall thickness and lumen diameter along with long fibers of <i style="">C. sativa</i> in which <i style="">I. carnea</i> deficits. The present study aims at optimizing the various operating parameters of alkoxygen delignification process for <i style="">I. carnea </i>and <i style="">C. sativa</i>. An oxygen pressure of 10 kg/cm<sup>2 </sup>at<sup> </sup>16% alkali dose, cooking temperature of 160<sup>0</sup>C for 120 min produces screened pulp yield 53.5% at kappa number 30 for <i style="">C. sativa</i> and 46.1% at kappa number 27 for <i style="">I. carnea</i>. The addition of 0.1% AQ at O<sub>2</sub> pressure of 10 kg/cm<sup>2</sup> improves pulp yield by 1.6% for <i style="">C. sativa</i> and 1.1% for <i style="">I. carnea</i> with a decrease of kappa number by 2 units in both the cases. <i style="">I. carnea</i> shows good bleaching response compared to <i style="">C. sativa</i>. Therefore, <i style="">I. carnea</i> pulp may be used as brightness improver to enhance the overall brightness of the blend.
Description: 523-528
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.16(6) [November 2009]

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