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Received December 30, 2013
Accepted July 9, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Investigation of operating parameters of water extraction processes for improving bio-oil quality
National Metal and Materials Technology Center (MTEC), 114 Thailand Science Park, Phahonyothin Road, Khlong 1, Khlong Luang, Pathumthani 12120, Thailand
sitthas@mtec.or.th, sittha@gmail.com
Korean Journal of Chemical Engineering, December 2014, 31(12), 2229-2236(8), 10.1007/s11814-014-0190-4
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Abstract
Water extraction of slow-pyrolysis bio-oil, in order to improve its quality, was investigated in terms of different schemes and operating parameters. The water extraction separated the bio-oil into two phases: an aqueous phase and an organic water-insoluble fraction (or “pyrolytic lignin”). Properties of the pyrolytic lignin extracted with different extraction schemes and conditions were characterized and compared. The results showed that the water temperature_x000D_
and stirring time did not significantly affect the pyrolytic lignin’s properties. The water : bio-oil ratio, however, could remarkably reduce the pyrolytic lignin’s acidity. Given the findings, an effective time- and resource-saving extraction scheme with appropriate operating conditions could be devised. The resulted pyrolytic lignin, which was essentially the “upgraded” bio-oil, had notably lower acidity, higher heating value, and more stability than the starting bio-oil, due to the removal of alcohols, ketones, carboxylic acids, sugars, ethers, as well as reactive compounds by the water extraction.
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