Vapor‐liquid equilibrium measurements for the propane‐ethanol system at elevated pressures

Abstract

Vapor-liquid equilibrium measurements have been carried out for the propane-ethanol system at 325O, 350°, 375O, 400°, and 425OK. The pressures corresponding to these temperatures ranged from 569.5 kPa (82.6 lb/ in.2abs) to 5 618.5 kPa (814.9 lb/in.Zabs). Altogether, nineteen experimental determinations were made; one of these determinations at 425OK approached the critical state, and this measurement assisted in establishing the entire critical temperature and critical pressure profiles for this binary system. The information associated with these measurements enabled the construction of isothermal bubble point-dew point relationships up to 50O0K. These results made possible the establishment of isothermal relationships of K values vs. pressure for the components of the propane-ethanol system.Calculated K values for this system using the BWR method and the SRK method were found to be in fair agreement with corresponding experimentd values.

Isothermal Vapor-Liquid Equilibrium Data for the Binaries Isobutane-Ethanol, Isobutane-1-Propanol, and Propane-Ethanol

“…For this reason the liquid-phase analysis is performed first. For the system propane (l)-ethanol (2) our liquid-phase results disagree with those from Gomez-Nieto and Thodos (8). They obtained higher liquid-phase propane concentrations at fixed T, P coordinates.…”

“…(5) hydrocarbon feeding line; (6) liquid-phase purging line; (7) filter; (8) filter; (9) four-way valve; (10) ten-way valve; (11) stirring magnet; (12) thermistor probe (to the temperature indicator); (2) vapor-phase sampling line; (3) feeding line; (4) alcohol feeding line; (5) hydrocarbon feeding line; (6) liquid-phase purging line; (9) four-way valve; (10) ten-way line (Figure 1). This line is covered with a heating tape, from the outlet of the liquid valve to the chromatograph injection port.…”

“…Figure1. Equilibrium cell: (V1-V5) valves; (1) liquid-phase sampling line; (2) vapor-phase sampling line; (3) feeding line;(4) alcohol feeding line;(5) hydrocarbon feeding line;(6) liquid-phase purging line;(7) filter;(8) filter;(9) four-way valve; (10) ten-way valve;(11) stirring magnet;(12) thermistor probe (to the temperature indicator);(13) glass window; (14) Viton O-ring; (15) Teflon washer; (16) pressing cylinder; (17) cell body; (18) aluminum shell; (19) heating resistances; (20) magnetic stirrer; (21) pressure measurement line; (22) temperature controller thermistor well; (23) electric contacts; (24) carrier gas inlet; (25) carrier gas outlet. The thermal insulation is not shown.…”

Isothermal vapor-liquid equilibrium data for the binaries propane-2-propanol and propylene-2-propanol

“…(9) cell body; (10) brass support for pressure transducer; (11) PVC tube; (12) glass window; (13) Teflon washer; (14) Viton O-ring; (15) copper gasket. magnetic circuit immersed in the thermostatic bath, was used for this purpose.…”

A comparison of mixing rules for the combination of COSMO-RS and the Peng–Robinson equation of state

“…Comparison of the VLE at 350 K and 450 K of the system ethanol(1)-propane(2) (squares[78]) computed with the VTPR EOS using the COSMO-RS model via different MRs with experimental data. The values for the internal parameters of the 1P, the 3P and the WS MR are given inTable 1.…”