Distillate properties and distillation diagrams

Constants for chemical compounds are to be found in the usual books of reference, e.g. [235], but the published figures should be considered critically. Considerable 

Distillation curve of a gasoline with carves for distillate properties 

Unfortunately it will frequently occur that the desired constants are not to be found in the literature in the requited form, and that they will need conversion to other conditions or recalculation. The fundamental work by Reid and Sherwood [236] deals with the properties of gases and liquids and their calculation. Another excellent reference book has been written by Hecht et al. [236]. It contains a systematic survey of the methods for calculating thermodynamic data of gases and liquids. 

Relation between the refractive indices at various temperatures of the normal fatty acids and the number of carbon atoms 

When a distillation is performed at atmospheric pressure it is necessary to take several readings of the barometric pressure. Variations of 20 mm in the reading can, for instance in the case of benzene, give rise to differences in the boiling point of 1 deg. C. The barometer should be checked against a precision instrument and a correction should be applied for the influence of temperature on the mercury column and the scale. This can be done without calculation by means of a nomogram due to Haussler [240] (Fig. 114). It is based on the formula 

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