Table of Contents
International Journal of Carbohydrate Chemistry
Volume 2015 (2015), Article ID 381242, 8 pages
http://dx.doi.org/10.1155/2015/381242
Research Article

Total Chlorine-Free Bleaching of Populus deltoides Kraft Pulp by Oxone

1Department of Pulp & Paper Industries, Faculty of Wood & Paper Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan 49175-487, Iran
2Young Researchers and Elite Club, Islamic Azad University, Karaj Branch, Karaj 31485-313, Iran

Received 19 May 2015; Revised 30 July 2015; Accepted 30 July 2015

Academic Editor: J. F. Vliegenthart

Copyright © 2015 Mohsen Miri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Since the bleaching process is one of the most important environmental pollutant stages in the pulp and paper industry, here, the total chlorine-free (TCF) bleaching of poplar kraft pulp by applying Oxone and peroxide under alkaline conditions has been investigated. The pulp samples were bleached in two stages of Oxone () treatment using an A sequence (A: acid pretreatment), and then the treated pulps were bleached by peroxide (P) to achieve target brightness (about 80%). The influence of various reaction parameters such as alkali charge, temperature, reaction time, and bleaching agent dosage was optimized. The final achieved brightness was more than 78%. Accelerated aging experiments showed more stability in brightness for the Oxone treated pulp, because alkali Oxone bleaching stops thermal degradation. Similarly, the AP bleaching sequence was found to be effective in regaining some strength that had been lost during acidification of the pulp. Improvement in pulp strength made with acid treatment was achieved along with significant amount of lignin removal and it demonstrates the feasibility of Oxone in TCF bleaching. Furthermore, other results indicated the feasibility of Oxone bleaching as an environmentally favorable alternative TCF bleaching sequence, compared with elemental chlorine-free bleaching approaches and also other TCF bleaching sequences.