NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.16 [2009] >
IJCT Vol.16(2) [March 2009] >


Title: Comparative study on hydrogen peroxide bleaching of soda-organosolv and Kraft rice straw pulps
Authors: Ziaie-Shirkolaee, Y
Keywords: Hydrogen peroxide
Bleaching
Kraft
Rice straw
Issue Date: Mar-2009
Publisher: CSIR
Abstract: Rice straw was cooked with three levels of alkali content (12, 14 and 16%) in cooking liquor by soda-organosolv (ethanol, diethylene glycol, dimethyl formamide) process. The effect of alkali addition on yield, kappa number, brightness and viscosity of organosolv unbleached pulps was studied. The TCF bleachability of these organosolv pulps and kraft pulp was carried out using a simple three stage peroxide bleaching sequence without oxygen pre-bleaching. All tested pulps were bleached under identical conditions during each stage. After full peroxide bleaching sequences of three alkali-organosolv pulps, some similarity in behaviour of brightness and peroxide consumption for each alkali percentage was observed. The final brightness of 63-70% ISO was attained for all tested pulps. The chemical charge required to reach this level of brightness varied for different pulps (despite the equal initial content of the residual lignin), which was directly related to starting brightness values. The high bleached yield for organosolv pulps (approximately, in range of 90–91% o.d.p) indicates to the limited organosolv carbohydrate degradation during peroxide bleaching. The strength properties of bleached organosolv pulps were higher than kraft pulp. No relation was found between improvement in brightness and lignin removal during hydrogen peroxide bleaching.
Page(s): 181-187
ISSN: 0971 – 457X
Source:IJCT Vol.16(2) [March 2009]

Files in This Item:

File Description SizeFormat
IJCT 16(2) 181-187.pdf164.15 kBAdobe PDFView/Open
 Current Page Visits: 903 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 620651 since 06-Feb-2009  Last updated on 13-Nov-2014Webmaster: nopr@niscair.res.in