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Licensed Unlicensed Requires Authentication Published by De Gruyter July 26, 2018

Additives to decrease cellulose chain scission during ozone bleaching of wheat straw pulp

Sandeep Kumar Tripathi EMAIL logo , Nishi Kant Bhardwaj and Himadri Roy Ghatak

Abstract

The efficacy of different chemical additives like acetic acid, ammonium molybdate, diethylene triamine pentaacetic acid (DTPA), mannitol, methanol, per acetic acid (PAA), sodium hypochlorite (NaOCl) and sulfamic acid as carbohydrate protector during ozone bleaching of wheat straw pulp was studied. DTPA was found the most effective additive for ozone bleaching followed by the methanol. Using DTPA during ozone treatment improved the delignification efficiency by 13.8 %, bleaching efficiency by 19.8 %, selectivity of ozone by 124 % and reduced the chain scission number of glycosidic linkages in cellulose by 55.3 % compared to that of control. Ozone treatment along with DTPA reduced the Fe, Cu and Mn content in the pulp by 52 %, 27 % and 70 %, respectively. Use of methanol improved the delignification efficiency by 9.0 %, bleaching efficiency by 12.2 %, selectivity by 32.4 % and reduced the chain scission number by 22.2 % compared to that of control. The NaOCl was found to be the most effective for improving the delignification efficiency followed by PAA, they improved the delignification efficiency by 29.3 % and 27.3 %, respectively. The PAA improved the bleaching efficiency to a maximum of 39.9 % followed by 30.2 % with NaOCl.

Acknowledgments

The first author is thankful to Director, Avantha Centre for Industrial Research & Development, Yamuna Nagar, Haryana, India for providing the facilities to complete this work.

  1. Conflict of interest: The authors declare no conflicts of interest.

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Received: 2018-03-06
Accepted: 2018-06-04
Published Online: 2018-07-26
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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