Analytical distillation-curve types correlations interconvert

New analytical correlations to convert among ASTM, TBP, EFV, and simulated distillation (SD) curves at atmospheric pressure are presented. The proposed correlations are simple to use and comparable in accuracy to the existing graphical methods. The two most used distillation procedures for characterizing petroleum fractions are the ASTM (American Society for Testing and Materials) and the true boiling point (TBP) methods. Both are analytical in nature and define volatility characteristics of petroleum and other complex mixtures. Both are batch distillations which differ mainly in the degree of fractionation obtained during distillation. Atmospheric ASTM distillations are run in an Engler flask. No packing is employed, and reflux results only from heat losses through the neck of the flask. ASTM distillations are more widely used than TBP distillations because the former are simpler, less expensive, require less sample, and require only approximately one-tenth as much time. Furthermore, ASTM distillations are standardized, whereas TBP distillations vary somewhat in procedure are apparatus.