ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Effect of ethyl acetate on carbohydrate components and crystalline structure of pulp produced in aqueous acetic acid pulping
Esat Gümüşkaya, Mustafa Usta, and Mualla Balaban Uçar
Department of Pulp and Paper, Faculty of Forestry, Karadeniz Technical University, 61080 Trabzon, Turkey
Received: 9 July 2008 Revised: 26 August 2008 Accepted: 4 September 2008
Abstract: The aim of this study was to investigate the changes in carbohydrate components and the crystalline structure in hemp bast
fibers by adding ethyl acetate to acetic acid/water pulping processes. It was found that ethyl acetate added to acetic acid/water
process had a positive effect on yield, viscosity and carbohydrate components in pulp. It was assumed that the delignification
ratio increased by adding ethyl acetate to aqueous acetic acid pulping. Xylose content in hemp bast fibers was affected more
negatively in the ethyl acetate/acetic acid/water process than in the acetic acid/water one. Crystallinity and crystallite
size were higher in pulp sample obtained by the acetic acid/water process without ethyl acetate.
Keywords: cellulose - hemicelluloses - crystallinity - X-ray - ethyl acetate
Full paper is available at www.springerlink.com.
Chemical Papers 63 (3) 284–290 (2009)