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This report describes the separation of 3-ethylpentane and the fractionation of 2,3dimethylpentane and l ,cis-3-dimethylcyclopentane from the aromatic-free fraction of petroleum normally boiling in t he range 89° to 94° C. These three compounds, together with t he four h ydrocarbon compounds previously separated, constitute substantially all of t he material of this fraction of petroleum . For t hese seven compounds, the normal boiling points (of high-puri ty samples not from the prescnt investigation) and t he estimated am ounts by volume in t he original Ponca, Oklahoma, crude petroleum are as follows: 2,3-dimethylpentane, 89.78° C, 0.1 percent; 2-methylhexan e, 90 .05° C, 0.7 percent ; 1,trans-3-dimethylcyclopentan c, 90.77° C, 0.9 percen t ; l ,cis-3-dimethylcyclopcntane, 91.72° C, 0.2 percent; 3-m ethylhexane, 91.85° C, 0.5 pcrccnt ; l,trans-2-dimethylcyclopentane, 91.87° C, 0.5 percen t; and 3-ethylpentane, 93 .47° C, 0.05 percent.

Separation of 2,3-dimethylpentane, 1,cis-3-dimethyl-cyclopentane, and 3-ethylpentane from petroleum