Liquid Saturation Density from Simple Equations of State

Mulero, A.; Cachadiña, I.

doi:10.1007/s10765-006-0140-4

Cited by 6 publications

(3 citation statements)

References 33 publications

(82 reference statements)

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“…Their method to compute the viscosity requires accurate density of the compressed sample, which is unavailable; therefore, they predicted the densities using the Peng−Robinson equation of state from estimated critical properties. Accurate liquid density predictions from cubic equations of state are problematic especially for long-chained hydrocarbons, and this may account for the difference in relative viscosity at high pressure.…”

Section: Resultsmentioning

confidence: 99%

High-Pressure Viscosity of Biodiesel from Soybean, Canola, and Coconut Oils

Duncan¹,

Ahosseini²,

McHenry³

et al. 2010

Energy Fuels

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Current and future injector designs for diesel engines approach pressures of greater than 100 MPa. However, the high-pressure physical properties, such as viscosity, of biologically derived diesel fuel (biodiesel) are nearly absent in the literature. This study focuses on the viscosity of biodiesel samples, fatty acid methyl esters (FAMEs), derived from soybean oil, soybean oil from Vistive soybeans, canola oil, recycled canola oil that has been used in cooking and frying, and coconut oil from 283.15 to 373.15 K and pressures up to 131 MPa. Petroleum-derived diesel (ultra-low sulfur, number 2 diesel) has also been investigated to compare to the biodiesel samples. The viscosity of the samples increases linearly with pressure until approximately 35 MPa, followed by a higher order response to pressure. Except for coconut-oil-derived biodiesel, the biodiesel samples have viscosities that are greater than petroleum-derived diesel at both ambient and elevated pressures. However, at lower temperatures and high pressures, the diesel and biodiesel samples become more similar. The viscosity of the biodiesel samples with pressure can increase nearly 300% over the pressure range investigated over their respective ambient-pressure viscosity; number 2 diesel increases up to ∼400% over similar pressures. The biodiesel samples at 283.15 K were found to experience pressure-induced cloud points (solid−liquid equilibrium) from 70 to 100 MPa, which significantly increases their viscosity. The Tait−Litovitz equation was found to correlate the data very well over the large range of both temperature and pressure.

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Section: Resultsmentioning

confidence: 99%

High-Pressure Viscosity of Biodiesel from Soybean, Canola, and Coconut Oils

Duncan¹,

Ahosseini²,

McHenry³

et al. 2010

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…However this improvement still does not achieve the accuracy typically yielded by the popular cubic EOS models. Paradoxically, it comes therefore into view that in spite of their weak theoretical basis, van der Waals−type equations might in fact provide important practical advantages (see also refs − ). This observation leads to the idea of gathering the strong sides of both SAFT and cubic EOSs by hybridizing both approaches.…”

Section: Introductionmentioning

confidence: 99%

Hybridizing SAFT and Cubic EOS: What Can Be Achieved?

Polishuk

2011

Ind. Eng. Chem. Res.

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This study deals with creating a concept of the hybrid model gathering the advantages of both cubic EOS and SAFT approaches. The proposed idea is a revision of the Chapman's et al. SAFT by addressing the problem of its numerical pitfalls and the issue of the space available for dispersive interactions with further attaching the SAFT part by the cubic EOS's cohesive term. It is demonstrated that the resulting model on one hand preserves the characteristic for SAFT accuracy in estimating the liquid compressibility, and on the other onethe characteristic for cubic equations capability of simultaneous modeling of critical and subcritical data. Moreover, on the basis of the comprehensive set of thermodynamic properties of 8 challenging for modeling compounds (including n-hexatriacontane, water, and methanol) it has been demonstrated that the proposed EOS has a superiority comparing even to one of the most successful versions of SAFT such as the SAFT-VR-Mie.

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“…The Peng−Robinson equation of state was used to determine the liquid-phase density, assuming that the density of methyl oleate was equal to the sunflower biodiesel. Cubic equations of state can be problematic when evaluating the liquid density of long-chained hydrocarbons, 56 and this may be the reason for such a large difference.…”

Section: Resultsmentioning

confidence: 99%

High-Pressure Viscosity of Soybean-Oil-Based Biodiesel Blends with Ultra-Low-Sulfur Diesel Fuel

et al. 2012

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Current and future injector designs for diesel engines approach pressures of greater than 100 MPa. However, the high-pressure physical properties, such as viscosity, of biodiesel blends with diesel fuel are nearly absent in the literature. This study focuses on the viscosity of biodiesel, diesel, and several biodiesel blends from 283.15 to 373.15 K and pressures up to 131 MPa. Soybean biodiesel (B100) and ultra-low-sulfur diesel (ULSD, B0) were combined to form biodiesel/diesel blends: B5, B10, B20, B40, B60, and B80. The viscosity of the samples increases linearly with the pressure until approximately 35 MPa, followed by a higher order response to pressure. The biodiesel blends with low biodiesel content (B5, B10, and B20) had very similar viscosities to ULSD. The normalized viscosity increased with a decreasing temperature and a decreasing biodiesel blend fraction. The viscosity of the various blends increased above the ambient pressure viscosity ranging from 164% at 373.15 K to 547% at 283.15 K at the highest pressure of 131 MPa. The biodiesel and some biodiesel blend samples at 283.15 K experienced pressure-induced cloud points (solid–liquid equilibrium) from 70 to 131 MPa. The Tait–Litovitz equation was found to correlate the biodiesel and diesel data with an absolute average relative deviation (AARD) of less than 1% over the large range of both temperature and pressure, and Kay’s mixing rule predicted the viscosity of the biodiesel blends with an AARD of 1.75%.

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Liquid Saturation Density from Simple Equations of State

Cited by 6 publications

References 33 publications

High-Pressure Viscosity of Biodiesel from Soybean, Canola, and Coconut Oils

High-Pressure Viscosity of Biodiesel from Soybean, Canola, and Coconut Oils

Hybridizing SAFT and Cubic EOS: What Can Be Achieved?

High-Pressure Viscosity of Soybean-Oil-Based Biodiesel Blends with Ultra-Low-Sulfur Diesel Fuel

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