Abstract
Recovery of tar acids from low temperature tar oil fraction boiling up to 270°C was investigated using glycols as solvent. AR grade ethylene glycol, diethylene glycol and triethylene glycol effected a recovery of 89%, 95.5% and 93.5%, respectively, of tar acids in two stages of extraction using a feed-solvent ratio of 1:1 by weight. Considerable amounts of neutral oil and tar bases were also extracted with solvents. Aqueous ethylene glycol (80 wt%) in the solvent-feed ratio of 1:1 was found to effect a recovery of 84% of the tar acids present in the tar oils in two extraction stages with 82% purity of tar acids. The purity of the extracted tar acids could be improved by the use of petroleum ether as a counter-solvent. The phase-equilibrium characteristics of the system, tar acids-neutral oil-80% aqueous ethylene glycol were studied. It has been shown that two theoretical extraction stages could effect the recovery of 98% of tar acids from a feed oil containing 45% of tar acids at the feed-solvent ratio of 1: 2 (by weight) and the highest degree of purity that could be achieved for tar acids is 87%.
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