In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more than about 1.6 wt. %.

 
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< Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrocarbons

> Integrated alkylation-isomerization process

~ 00420