Vapor pressures and boiling points of some paraffin, alkylcyclopentane, alkylcyclohexane, and alkylbenzene hydrocarbons

Abstract

Measurements of vapor pressures and boiling points, over the range 47 to 780 millimeters of mercury and above ah>out 12° C, were made on 52 purified hydrocarbons. The apparatus consisted of an electricaUy heated boiler, a vapor space with a vertical reentrant tube containing a platinum thermometer having a resistance of 25 ohms, and a condenser. Measurements of the temperature of the liquid-vapor equilibrium were made at 20 fixed pressures maintained automatically. The values of the fixed pressures were determined by calibration of the apparatus with water by using the vapor pressure-temperature tables prepared at the National Bureau of Standards.The experimental data on the hydrocarbons were correlated, the method of least squares being used, with the three-constant Antoine equation for vapor pressures, log P=A-B/(C+t) or t=B/(A-Iog P)-C. Experimental data, together with the values of the three constants of the Antoine equation, applicable over the range of measurement, are reported for 30 paraffin, 4 alkylcyclopentane, 10 alkylcyclohexane, and 8 alkylbenzene hydrocarbons.

Assembly, testing, and operation of laboratory distilling columns of high efficiency

“…Details are given in the legend of figure 1. The tungsten contacts are conditioned as described m part II of reference [7].…”

“…(a) 2,3,4-Trimethylpentane and 2,3,3-trimethylpentane, with normal boiling points of 113.467° and 114.760° C, a difference of 1.293° C [7]; (b) 2,5-Dimethylhexane and 2,4.-dimethylhexane, with normal boiling points of 109.103° and 109.429° C, a difference of 0.326° C [7]. From the data on vapor pressures recently reported on these compounds [7], and making the assumption of ideality as previously done above, the values of the constants of eq 3 applicable to these foregoing two test mixtures become as follows: …”

“…The details of the mercury manometers used in controlling the pressures constant at given values are shown in figure 11. The operation of the system for controlling pressures is essentially identical with that previously described in another report from this laboratory [7]. All of the connections and joints in the system, including one metal to glass tapered joint [8] at each controlling manometer (B, fig.…”

Thermodynamics of molecular interactions between nitromethane and aromatic hydrocarbons

“…HE, and GE data of the mixtures of nitromethane with benzene, toluene, binary mixtures of nitromethane with aromatic hy-o-xylene, p-xylene, and m-xylene at 303. 15 Excess volumes of mixing were measured as a function of composition using the direct dilatometric method (1 1). The temperature of the thermostatic bath was controlled to k0.01 K. The uncertainty in experimental VE values is about 0.5%.…”

The influence of modification methods on physico-chemical and sorption properties of sepiolite

“…Vrednosti p o su izračunate upotrebom Antoine-ove jednačine korišćenjem literaturnih podataka za n-C 6 H 14 , CHCl 3 benzen i THF [144][145][146] .…”