Purification of the commercial plasticizer D. O. S. was carried out on the rate of distillation, 4050 cc/hour at 190200°C, with the continuous high-vacuum distillation apparatus having been described in the preceding report.
Yield was 70%, and the obtainable final vacuum was 1.52.0×10
-1mmHg at 180190°C, Then, for the binary mixture of pure D. O. S. and D. O. P. (di-2-ethylhexyl phthalate), the fractionation efficiency of this apparatus on the various distillation conditions were studied.
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