Liquid−Liquid Equilibria for Glycols + Hydrocarbons:  Data and Correlation

Abstract

Liquid-liquid equilibrium data for seven binary glycol-hydrocarbon systems have been measured in the temperature range 32 °C to 80 °C and at the pressure 1 bar. The measured systems are monoethylene glycol (MEG) + heptane, methylcyclohexane (MCH) + hexane, propylene glycol (PG) + heptane, diethylene glycol (DEG) + heptane, triethylene glycol (TEG) + heptane, and tetraethylene glycol (TETRA) + heptane. The data obtained were correlated with the NRTL model and two different versions of the UNIQUAC equation. The NRTL model and one of the UNIQUAC equations (UQ 4) have a linear temperaturedependent interaction parameter term, while the other UNIQUAC equation (UQ 2) has an interaction parameter that is independent of the temperature. There was a fairly good agreement between the experimental data and the models with an average deviation in the composition for both phases of 3% for both NRTL and UQ 4 and 15% for UQ 2. These results indicate the necessity of using the linearly dependent interaction parameters.

Mutual solubility of MEG, water and reservoir fluid: Experimental measurements and modeling using the CPA equation of state

“…2 in comparison with the experimental data from the literature. The solubility data of n-heptane in MEG is in good agreement with those of Staveley and Milward [16], Derawi et al [17] and Lindboe et al [18]. On the other hand solubility data of MEG in n-heptane is in good agreement with the data from Lindboe et al whereas slightly lower than those from Staveley and Milward and Derawi et al…”

“…Benzene in MEG Folas et al [12] n-C7 in MEG Derawi et al [17] n-C7 in MEG Lindboe et al [18] n-C7 in MEG this work Codensate in MEG this work n-C7 in MEG Benzene in MEG Condensate in MEG given by Eq. (2)…”

“…MEG in n-C7 Staveley et al [16] MEG in n-C7 Derawi et al [17] MEG in n-C7 Lindboe et al [18] MEG in n-C7 this work n-C7 in MEG Derawi et al [17] n-C7 in MEG Lindboe et al [18] n-C7 in MEG this work MEG in n-C7 n-C7 in MEG n-C7 in MEG phase MEG in n-C7 phase interaction parameter between n-heptane and MEG (k ij = 0.047) as given in Table 7 is taken from Derawi et al [23].…”

Measurement of Liquid–Liquid Equilibria for Condensate + Glycol and Condensate + Glycol + Water Systems

“…The sketch for the experimental setup used in this work is shown in Figure 1. A similar setup has been used in the previous work by Folas et al 5 and Derawi et al 6 for the experimental study of liquidÀliquid equilibria of well-defined hydrocarbons and polar compounds. In this work some necessary modifications were made in the analytical methods because the hydrocarbon phase is a condensate of higher complexity as compared to the well-defined hydrocarbons.…”

Application of stochastic algorithms for parameter estimation in the liquid–liquid phase equilibrium modeling

“…Table 2 Results for phase stability and split calculations for system ST1: ethylene glycol(1) + dodecanol(2) + nitromethane(3) at 295 K and 1 atm and ST2: toluene(1) + water(2) + aniline (3) It can be observed from this table that the use of SA and PSO algorithms led to the same values of the parameters for both systems S1 and S2, but with a lesser computation effort verified for SA. According to Derawi et al [54], modeling results of S1 system give composition deviations (average absolute deviation, ADD%, Eq. (31)) between 1.3-3.7% for UNIQUAC model and 1.1-3.2% for NRTL, while in this work global error in composition were 0.138% for UNI-QUAC and 0.116% for NRTL, a much better result.…”