Vapor−Liquid Equilibrium Measurements for Three Binary Mixtures:  Allyl Alcohol/Acetonitrile, 2-Butoxyethanol/Acetic Acid, and 1-Methoxy-2-Propanol/2,3-Epoxy-1-Propanol

Abstract

Vapor-liquid equilibrium measurements using the PTx method have been made on three binary mixtures: allyl alcohol/acetonitrile, 2-butoxyethanol/acetic acid, and 1-methoxy-2-propanol/2,3-epoxy-1propanol. Each binary mixture was studied at two temperatures. Equilibrium vapor-and liquid-phase compositions were derived from the PTx data using the Soave-Redlich-Kwong equation of state to represent the vapor phase and the NRTL activity coefficient model to represent the liquid phase.

Physical properties of (jojoba oil+n-hexane) compared with other (vegetable oil+n-hexane) mixtures

“…Klamt and Eckert [7] and Wilding et al [8] reported the vapour pressures at two temperatures only. All these results, together with ours, are plotted in figure 1 and are seen to be in excellent agreement.…”

“…Vapour pressure of 1-methoxy-2-propanol p plotted as a function of temperature T. (d)[5]; (j)[6]; (M)[7];(N)[8]; (s) this work.…”

“…In all the cases, equation (8) was used to correlate the activity coefficients of n-hexane (the ratio of molar volumes was based on densities taken from the literature and the average molar mass of commercial oils was assumed to lie in (873 to 875) range.…”

“…For other vegetable oils, and only also in a very concentrated oil mixtures, Norris [18] reported that the activity coefficients vary in the narrow limits from 0.5 to 0.6. The evaluated activity coefficients were correlated using equation (8) and the excess thermodynamic functions were determined from equations (9) in - figure 5. As can be observed in the soybean rich oil mixtures, the excess Gibbs free energy of mixing G E (348.15 K, x 1 < 0.5) is also negative, but the order and magnitude of the other excess thermodynamic functions of mixing are different compared with the jojoba oil mixtures, TS E (T, x 1 ) % H E (T, x 1 ) ) jG E (T,x 1 )j.…”

“…They include the vapour pressures of three compounds with relatively high boiling temperatures (1-methoxy-2-propanol, 2-ethyl-6-methylaniline, and N-methoxyisopropanol-6-ethyl-methylanline). Of these, only the vapour pressures of 1-methoxy-2-propanol are known in the literature [5][6][7][8], and therefore they are worth being reported. In order to illustrate the properties of jojoba oil compared with those of other vegetable oils, the available data from other investigations are also re-evaluated and discussed.…”