Toluene-decane blends

Ehase Inversion Temperatures It was possible to determine the Phase Inversion Temperature (PIT) for the system under study by reference to the conductivity/temperature profile obtained (Figure 2). Rapid declines were indicative of phase preference changes and mid-points were conveniently identified as the inversion point. The alkane series tended to yield PIT values within several degrees of each other but the estimation of the PIT for toluene occasionally proved difficult. Mole fraction mixing rules were employed to assist in the prediction of such PIT values. Toluene/decane blends were evaluated routinely for convenience, as shown in Figure 3. The construction of PIT/EACN profiles has yielded linear relationships, as did the mole fraction oil blends (Figures 4 and 5). The compilation and assessment of all experimental data enabled the significant parameters, attributable to such surfactant formulations, to be tabulated as in Table II. 

Figure 3. Conductivity/temperature profiles for toluene/decane blends...

Figure 10. Phase inversion temperature variation for decane/toluene blends...

Note D = decane D/T = 1.1 by volume blend of decane and toluene. AESo and AEGS surfactants were experimental research samples synthesized for this study. 

In contrast, the presence of decane generally had little detrimental effect on the AEGS 10-minute foam volume under these test conditions. However, the AEGS surfactants did exhibit significantly reduced foam volumes in the presence of a 1 1 blend of decane and toluene. 

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