Binary Hydrocarbon Mixtures

Dilute Binary Hydrocarbon Mixtures Hayduk and Minhas [12] presented an accurate correlation for normal paraffin mixtures that was developed from 58 data points consisting of solutes from C5 to C32 and solvents from C5 to C16. The average error was 3.4 percent for the 58 mixtures. 

Matthews and Akgerman [19] The free-volume approach of Hildebrand was shown to be valid for binary, dilute liquid paraffin mixtures (as well as self-diffusion), consisting of solutes from C8 to C16 and solvents of C6 and C12. The term they referred to as the diffusion volume was simply correlated with the critical volume, as VD = 0.308 Vc. We can infer from Table 5-11 that this is approximately related to the volume at the melting point as VD = 0.945 Vm. Their correlation was valid for diffusion of linear alkanes at temperatures 

Riazi and Whitson [21] They presented a generalized correlation in terms of viscosity and molar density that was applicable to both gases and liquids. The average absolute deviation for gases was only about 8 percent, while for liquids it was 15 percent. Their expression relies on the Chapman-Enskog correlation [Eq. (5-202)] for the low-pressure diffusivity and the Stiel-Thodos [AlChE J., 7, 234 (1961)] correlation for low-pressure viscosity  

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Five binary-hydrocarbon mixtures of ethane or ethylene with heavier hydrocarbons were studied (Table III). The only substrate used in these studies was water. If an RPT did not occur, ice always formed rapidly. When n-butane or n-pentane was the heavier component, RPTs were 100% reproducible over a particular composition range. This was not, however, true if the heavier component were propane. 

Cash L, Cayias JL, Pournier G, MacAllister D, Shares T, Schechter RS, Wade WH (1977) The application of low interfacial tension scaling rules to binary hydrocarbon mixtures. J Colloid Interface Sci 59 39-44... 

Convergence pressures of binary hydrocarbon mixtures may be estimated from the critical locus curves given in Figure 2-16. A similar curve which includes multicomponent mixtures is presented in Figure... 

The Pressure-Volume Diogram for a Two-Component System. Consider the presBUre-volume diagram of a binary hydrocarbon mixture... 

Figure 4.5. K>values of ethane in binary hydrocarbon mixtures at 100 F.

In order to gain a rough impression of the relation between differences in boiling point and the required number of separating stages, the values for binary hydrocarbon mixtures at normal pressure, given by Hilberath [151], are quoted in Table 15. 

Tabitha the Untutored is working with some binary hydrocarbon mixtures that boil above 450 K. She reads in her thermo textbook that "Such substances form athermal mixtures that is, no change in temperature occurs when the pure components are mixed adiabatically."... 

THE SURFACE TENSION AND DENSITY OF BINARY HYDROCARBON MIXTURES. BENZENE-N-HEXANE AND BENZENE-N-DODECANE. 

It has been found that the viscosities of many non-hydrocarbon liquid mixtures at a fixed temperature and pressure exhibit a maximum or a minimum as a function of composition [2]. However, this effect is small for hydrocarbons as shown in Figure 4, where the viscosities of binary hydrocarbon mixtures are seen to change almost linearly with mole fraction. 

In this form, the Pedersen et al. model can be extended only to well-defined mixtures for which critical properties of the constituents are available. They tested their models for 419 data points of seven binary hydrocarbon mixtures and were able to predict mixture viscosities with an average error of 7.4%. 

This result (the Lewis correlation) has been found empirically to be of more general applicability than the Langmuir equations from which it is derived. Representative data, taken from the work of Lewis et al., showing the approximate conformity of experimental data for sorption of several binary hydrocarbon mixtures on silica gel are shown in Figure 4.15. Combining Eq. (4.14) with Eq. (3.57) and the definition of separation factor (a) [Eq. (1.1)] yields... 

Mentzer, R. A. Greenkorn, R. A. Chao, K. C. Bubble pressures and vapor-liquid equilibria for four binary hydrocarbon mixtures J. Chem. Thennodyn. 1982,14, 817-830... 

Figure 4.28 Calculated saturation pressures and stability limits for three binary hydrocarbon mixtures = 70%),...

Bhatia, S. 1998. Adsorption of binary hydrocarbon mixtures in carbon slit pores A density functional theory study. Langmuir 14 6231. 

John Prausnitz had mentioned the excellent agreement with experiment that Mollerup had obtained in the gas-liquid critical region of binary hydrocarbon mixtures. Mollerup s results were obtained with a good reference equation of state for methane (but one which is classical in form and so which does not describe accurately the known nonclassical singularities in the thermodynamic functions at the critical point), and with a one-fluid model based on a mole fraction average (or "mole fraction based mixing rules"). 

In Fig. 4, a typical binary diagram of a binary hydrocarbon mixture is shown. Such a diagram corresponds to the light component 1, which is gas at a given temperature, and heavy component 2, which remains liquid. Other possible cases may be considered in a similar way. 

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