Isolation of 1,2,3,4-tetramethylbenzene, 5,6,7,8-tetrahydronaphthalene, 1-methyl-5,6,7,8-tetrahydronaphthalene, and 2-methyl-5,6,7,8-tetrahydronaphthalene from petroleum

Abstract

This paper reports the isolation of four additional aromatic hydrocarbons from the kerosene fraction of the petroleum being investigated by the American Petroleum Institute Research Project 6. Their separation was accomplished by a combination of the physical methods of fractionation of azeotropic distillation and crystallization. "Best" lots of each of these four hydrocarbons from petroleum were prepared, and synthetic lots of three of them were purified for purposes of identification and determination of properties. The amounts of impurity in these various lots of material were determined as follow s, in mol e fraction: