Methanol-mediated extraction for coal liquid (2) - the effect of phase separation caused by methanol on naphtha fraction derived from Wyoming coal

Methanol-mediated extraction, which the authors have developed, was conduct ed on the naphtha fraction derived from Wyoming coal. When 0.4-1.5 times me thanol was added to the feed oil, the mixture formed a two-phase system. Th e extraction yield of phenol ranged from 86.3% to 99.2% and that of oil fra ction ranged from 65.5% to 91.0%. This indicates that the extraction of phe nol by methanol only was ineffective. Two extraction methods, extraction with water regardless of the presence of phase separation (method A), and that after separating the formed phase (m ethod B), were conducted to compare the effect of phase separation on the e xtraction yield and selectivity of phenol. They had no significant differen ces between two extraction methods. From these results, we concluded that m ethod A is applicable even if phase separation may occur by adding methanol . (C) 2000 Elsevier Science B.V. All rights reserved.