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Investigation of operating parameters of water extraction processes for improving bio-oil quality
Boonyawan Yoosuk,Sittha Sukkasi,Jiraporn Boonpo,Parncheewa Udomsap 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
Water extraction of slow-pyrolysis bio-oil, in order to improve its quality, was investigated in terms ofdifferent schemes and operating parameters. The water extraction separated the bio-oil into two phases: an aqueousphase and an organic water-insoluble fraction (or “pyrolytic lignin”). Properties of the pyrolytic lignin extracted withdifferent extraction schemes and conditions were characterized and compared. The results showed that the water tem-perature 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 ex-traction scheme with appropriate operating conditions could be devised. The resulted pyrolytic lignin, which was es-sentially the “upgraded” bio-oil, had notably lower acidity, higher heating value, and more stability than the startingbio-oil, due to the removal of alcohols, ketones, carboxylic acids, sugars, ethers, as well as reactive compounds by thewater extraction.