Aliasghar Tatari, Mohammadreza Dehghani Firouzabadi, Ali Ghasemian
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SO2-alcohol-water (SAW) fractionation of Eldar pine (Pinus eldarica): effects of alcohol type on pulp and paper properties
Generally, ethanol is the alcohol commonly used in the SO2-alcohol-water (SAW) fractionation process. In this study, Eldar pine (Pinus eldarica) was fractionated with different alcohols (methanol, isopropanol, and 2-methyl-2-propanol, in comparison to ethanol) at 135 °C, duration (60–120 min.), and liquor composition (SO2:alcohol:water = 12:44:44, w/w%) to achieve a consistent kappa number (∽25). The field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to analyze the changes in physical and chemical structure characteristics of selected pulps. The use of isopropanol, as opposed to ethanol (common alcohol in SAW fractionation), showed a beneficial effect on the delignification rate. Meanwhile, both methanol and 2-methyl-2-propanol reduced the delignification rate. Moreover, isopropanol pulp required fewer beating revolutions to achieve a similar freeness (∽385 mL CSF) compared to other alcohols. Handsheets produced from isopropanol fractionation exhibited superior characteristics, including air permeability, apparent density, and tensile, tear, and burst indexes, when compared to those obtained from other alcohols. Overall, isopropanol is a highly suitable alternative to ethanol in SAW fractionation.
期刊介绍：
European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets.
European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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