A Controller for Maintaining a Constant Rate of Vaporization in Fractional Distillation.

2,3-dimethylpentane and 2-methylhexane as a test mixture for evaluating highly efficient fractionating columns

“…While operating at total reflux, samples of 2 ml each were taken of the distillate and the returning material at 24-hr intervals for a period of 7 days. During a run the rate of vaporization was controlled by a thermistor-actuated control device [7]. The composition of the samples was determined with the differential refractometer which was calibrated with known compositions of the two test mixtures.…”