Modified Hydrogen Peroxide Bleaching of Bamboo Chemo-mechanical Pulp Using Aqueous Alcohol Media

Fangmin Liang, Guigan Fang, Jian Jiao, Yongjun Deng, Shanming Han, Hongbin Li, Qingwen Tian, Aixiang Pan, Beiping Zhu

Abstract


The brightness of bleached bamboo chemo-mechanical pulp (CMP) is often too low to be used as a furnish in value-added paper products. In this study, preliminary optimization of various parameters of a modified hydrogen peroxide (H2O2) bleaching procedure for bamboo CMP pulps was performed using the inclusion of ethanol in the bleaching medium (IEBM). Compared with a conventional bleaching method, this modified process is aimed at improving bleaching efficiency and brightness ceiling of bamboo CMP with the proper usage of chemicals. The CMP was bleached to a brightness of 74.2% ISO at the usage level of 12% H2O2, which shows it increased by 7.4% ISO compared with the conventional method. For a brightness target of 72.0% ISO, bleaching with the IEBM method reduced the H2O2 consumption by approximately 60%. In addition, a higher activation energy of H2O2 for the IEBM method was calculated to be 23.3 kJ/mol, which was increased by 3.3 kJ/mol compared with the conventional method.

Keywords


Bamboo; Hydrogen peroxide; Chemo-mechanical pulp; Bleaching

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