Abstract
AbstractAqueous acetic acid has been found to be a good solvent for the extraction of tar acids from low‐temperature tar oils. Acetic acid 60% (w/w) at 25° in the solvent/feed ratio of 1 : 0.8 effects a recovery of more than 89% of the tar acids present in the tar oils in two extraction stages. Besides tar acids, the acetic acid also extracts tar bases and neutral oils present in the oil to some extent. Re‐extraction with light petroleum reduces the neutral oil carry‐over by about 50%.The phase‐equilibrium characteristics of the system tar acids‐(bases + neutral oils)‐60% aqueous acetic acid have been studied. It is seen that two theoretical extraction stages could effect the recovery of 96% of tar acids from a feed oil containing 45% of tar acids. Use of light petroleum could reduce the neutral oil contamination of the extract by 76.2%. The tar acids could be recovered from the extracts by distillation.
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