Effect of Boric Acid Addition on the Prehydrolysis of Whangee

Ruiping Tong, Chaojun Wu, Chuanshan Zhao, Dongmei Yu

Abstract


Prehydrolysis is an important step in the kraft-based dissolving process for pulp production, as it helps remove as much hemicellulose as possible from cellulose fibers before the material is subjected to the main delignification operation, i.e., pulping. In this paper, a novel process concept was proposed by adding different dosages of boric acid (BA) based on the oven dry weight of Whangee, a genus of bamboo, in the prehydrolysis stage. The final yields of the prehydrolysis stage obviously increased and ferric ion contents in the hydrolyzed Whangee largely decreased with the addition of BA. Additionally, the highest α-cellulose retention occurred at a BA dosage of 0.5%. The results of acetic acid percent in the total sugars and furfural percent in xylose of the PHL showed that the addition of BA had an important impact on the structure of hemicelluloses in Whangee. Mass balance analysis of the PHL and Whangee indicated that the partly acid-insoluble lignin in Whangee was likely converted into acid-soluble lignin in the PHL.

Keywords


Boric acid; Prehydrolysis liquor; Whangee; Dissolving pulp

Full Text: PDF

Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022, hubbe@ncsu.edu; Lucian A. Lucia, (919) 515-7707, lucian.lucia@gmail.com URLs: bioresourcesjournal.com; http://ncsu.edu/bioresources ISSN: 1930-2126