Extractive distillation of mixtures containing aromatic and olefinic hydrocarbons

摘要

Aromatic hydrocarbons containing 6-10 carbon atoms per molecule are separated from close-boiling olefinic hydrocarbons by extractive distillation employing as solvent either N-methyl-2-thiopyrrolidone alone, or a mixture of N-( beta -mercaptoethyl)-2-pyrrolidone and N-methyl-2-thiopyrrolidone, or a mixture of N-( beta -mercaptoethyl)-2-pyrrolidone and N-methyl-2-pyrrolidone.