New association schemes for tri-ethylene glycol

Triethylene Glycol Solubility in High-Pressure Methane: New Experimental Data at 40 to 60 °C

“…The thermodynamic modeling of the TEG-CH 4 system indicated that the CPA model was able to reasonably predict the new experimental data, using the parameters established by Derawi et al 9 Regression analysis of the data showed that the best fit was obtained for a temperature-independent binary interaction parameter of k ij = 0.136 ± 0.006. However, a comparable fit was obtained when using the value of 0.1643 established by Qvistgaard et al 16 More experimental data are required to determine the best value in this case and to confirm whether a temperature dependence is justified.…”

“…As shown in Table and Figure , the best fit to the current experimental data set utilized a binary interaction parameter of k ij = 0.136 ± 0.006. However, a comparable result could be achieved with the parameter used by Qvistgaard et al . of 0.1643.…”

“…As shown in Table 2 and Figure 4, the best fit to the current experimental data set utilized a binary interaction parameter of k ij = 0.136 ± 0.006. However, a comparable result could be achieved with the parameter used by Qvistgaard et al 16 of 0.1643. In both cases, the model parameters can fit the data of Fisher et al at 25 °C (Figure 1) and is intermediate between the data for Qvistgaard et al at 60 bar and that at 125 bar.…”

“…Three cases were considered for the value of the binary interaction parameter. In the first case, this was fixed at the value used by Qvistgaard et al 16 of 0.1643. In the second case, regression of the experimental data was used to determine the best value across the data set.…”

“…Breil and Kontogeorgis 15 successfully fit the vapor pressure data of Jerinic et al, 8 but this set of parameters provides very high deviations for experimental data for pure TEG. Conversely, the parameters proposed by Derawi et al 9 can fit the data for pure TEG, but not the data of Jerinic et al 8 This problem was investigated by Qvistgaard et al 16 who considered both changes to the TEG critical temperature and alternate association schemes to try and resolve the issue. These authors concluded that the best approach was to use a new set of parameters with the 4F association scheme.…”