Liquid–liquid equilibrium in the systems furfural+light lubricating oils using UNIFAC

Espada, Juan J.; Coto, Baudilío; Peña, José L.

doi:10.1016/j.fluid.2007.06.024

Cited by 14 publications

(11 citation statements)

References 20 publications

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“…The partition coefficient of benzene in THFA þ water was found to be comparable to that in furfuryl alcohol and to that in sulfolane. Coto et al 7 and Espada et al 8 studied the LLE of furfural and lube oil cuts (light, medium, and heavy neutral distillates) for the removal of aromatics from lube oils.…”

Section: ' Introductionmentioning

confidence: 99%

Liquid−Liquid Equilibria Measurement of Systems Involving Alkanes (Heptane and Dodecane), Aromatics (Benzene or Toluene), and Furfural

Kumar¹,

Mohan²

2011

J. Chem. Eng. Data

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Liquid-liquid equilibria (LLE) of alkane þ aromatic þ solvent systems is of interest in connection with the extraction of aromatics from petroleum fractions, for example, naphtha, distillates, lube oil, and so forth. Though the actual industrial systems contain a large number of compounds, LLE studies on a smaller number of representative compounds are also important in the development of theoretical/semiempirical LLE models for use in the design of extraction processes. In the present work LLE data has been experimentally obtained for the ternary systems heptane þ benzene þ furan-2-carbaldehyde (furfural) and heptane þ methylbenzene (toluene) þ furfural at two temperatures (298.15 and 303.15) K, and for the quaternary systems heptane þ dodecane þ benzene or toluene þ furfural at 298.15 K. The data are seen to be correlated excellently by the nonrandom two-liquid model. The model parameters were determined by data regression using the Nelder-Mead optimization technique. The model also enabled tie line calculations between the last experimental tie line and the plait point, thereby giving the shape of the full two-phase region.

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Section: ' Introductionmentioning

confidence: 99%

Liquid−Liquid Equilibria Measurement of Systems Involving Alkanes (Heptane and Dodecane), Aromatics (Benzene or Toluene), and Furfural

Kumar¹,

Mohan²

2011

J. Chem. Eng. Data

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“…These systems are FA + water + aromatics (benzene, toluene, o-xylene) + alkanes (heptane, methylcyclopentane), heptane + toluene + furfurylamine + water, and heptane + toluene + THFA + water. LLE of furfural and lube oil cuts (light, medium, and heavy neutral distillates) has been studied by Coto et al 10 and Espada et al 11 for aromatics removal from lube oils.…”

Section: ■ Introductionmentioning

confidence: 99%

Quinary and Eight-Component Liquid–Liquid Equilibria of Mixtures of Alkanes, Aromatics, and Solvent (Furfural)

Kumar

Mohan

2013

J. Chem. Eng. Data

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Liquid–liquid equilibria (LLE) of alkane + aromatic + solvent systems is needed in relation to separation of aromatics from petroleum fractions, for example, naphtha, distillates, and lube oil. Further to earlier work, experimental LLE data for the quinary system “heptane + dodecane + benzene + methylbenzene (toluene) + furan-2-carbaldehyde (furfural)” at three temperatures (298.15, 308.15, and 318.15) K, and for the eight component system “heptane + dodecane + cyclohexane + benzene + toluene +1,2-dimethylbenzene (o-xylene) + ethylbenzene + furfural” at (303.15 and 308.15) K has been obtained. Excellent correlation of data by the nonrandom two-liquid (NRTL) model was seen for the quinary system, with the model parameters found by data regression. The model enabled tie line calculations for the full two-phase region. The UNIFAC-LLE model was also employed and the predicted results were found to be in fairly good agreement with experimental data, though not as close as in the NRTL case.

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“…4À8 However, other schemes as model molecule approaches are required to describe liquidÀliquid equilibrium processes (LLE) because chemical structure has much bigger effect than boiling temperatures. 9,10 The correct characterization of the pseudocomponents requires the accurate estimation of the bulk properties (boiling point, density, and molecular weight), which are seldom available. The determination of boiling point and density is well reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…The accuracy of a model to describe equilibrium properties depends not only on the thermodynamic basis but also on the number of pseudocomponents taken into account to describe the extremely high number of compounds in petroleum fractions. These mixtures are usually described by conventional pseudocomponent definition procedures based on distillation curves, effective in vapor–liquid equilibrium processes (VLE). − However, other schemes as model molecule approaches are required to describe liquid–liquid equilibrium processes (LLE) because chemical structure has much bigger effect than boiling temperatures. , …”

Section: Introductionmentioning

confidence: 99%

Evaluation of Different Methodologies to Determine the Molecular Weight of Petroleum Fractions

2011

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The correct characterization of petroleum fractions is crucial to correctly describe the processes in which they are involved. Most of the properties required to complete the characterization of these mixtures can be determined by well established methods. However, in the case of molecular weight, it is frequently determined by empirical correlations because of the scarcity of reliable methods. This work aims at evaluating the suitability of different techniques to calculate the molecular weight of petroleum mixtures. Cuts from three different crude oils within the whole range of boiling temperatures were analyzed by gel permeation chromatography (GPC) and high temperature gas chromatography (HT-GC). The former is a direct methodology to obtain the molecular weight. The latter, however, requires a process calculation as it yields the distillation curve, which must be converted into composition distribution. In this work, this calculation was performed by means of two continuous distribution models of different complexity. The molecular weight values obtained by GPC and HT-GC-based models were in good agreement, despite their different approach.

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Liquid–liquid equilibrium in the systems furfural+light lubricating oils using UNIFAC

Cited by 14 publications

References 20 publications

Liquid−Liquid Equilibria Measurement of Systems Involving Alkanes (Heptane and Dodecane), Aromatics (Benzene or Toluene), and Furfural

Liquid−Liquid Equilibria Measurement of Systems Involving Alkanes (Heptane and Dodecane), Aromatics (Benzene or Toluene), and Furfural

Quinary and Eight-Component Liquid–Liquid Equilibria of Mixtures of Alkanes, Aromatics, and Solvent (Furfural)

Evaluation of Different Methodologies to Determine the Molecular Weight of Petroleum Fractions

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