Thermal quantities of some cycloparaffins. Part II purification of the samples)

Purification of the cyclanes with 4 to 9 C‐atoms was effected by fractional distillation. Progress of the purification was checked with the aid of melting curves of the fractions (heat content vs. temperature curves of the melting process). The impurity content of the final samples is estimated at less than 0,2%. A fractionating column with a rotating cylinder and a small calorimeter for measurements on melting and transition processes at temperatures from — 180° to +70° are described.