Thermodynamics of semicontinuous n-alcohol/ultra-low sulfur diesel blends

Hernández-Ortiz, Juan P.; Bustamante, Felipe; Agudelo, John R.

doi:10.1016/j.fluid.2015.05.013

Cited by 7 publications

(11 citation statements)

References 24 publications

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“…The composition of this diesel fuel was obtained by an analytical approach described in the Supporting Information (S2), assuming a γ distribution for each family (paraffins, naphthenes, and aromatics). 48 This γ distribution (see Table 2) provided the best fit between experimental and predicted data. The same concentration (33.33% w/w) was assumed for each family in the diesel fuel.…”

Section: Experimental Protocol and Test Fuelsmentioning

confidence: 81%

“…The ultralow diesel fuel (ULSD) was supplied by the Colombian petroleum company (Ecopetrol). The composition of this diesel fuel was obtained by an analytical approach described in the Supporting Information (S2), assuming a γ distribution for each family (paraffins, naphthenes, and aromatics) . This γ distribution (see Table ) provided the best fit between experimental and predicted data.…”

Section: Experimental Protocol and Test Fuelsmentioning

confidence: 99%

“…p sat ( T ) k is the vapor pressure at saturation conditions, which traditionally has been calculated with the Antoine equation. Instead, since the Antoine coefficients are not available in the literature for all the compounds selected as representative of diesel fuel composition, the Clausius–Clapeyron eq (eq ) was used in this work, as well as in a previous work . After determination of the saturated vapor pressure for each component (at the specific flash-point temperature of each component) and introduction of these results in the denominators of eq , this equation can be solved to obtain the flash-point temperature of the blend (common to all numerators).…”

Section: Prediction Of the Flash-point Temperature Of Alcohol/diesel ...mentioning

confidence: 99%

“…Instead, since the Antoine coefficients are not available in the literature for all the compounds selected as representative of diesel fuel composition, the Clausius−Clapeyron eq (eq 2) was used in this work, as well as in a previous work. 48 After determination of the saturated vapor pressure for each component (at the specific flash-point temperature of each component) and introduction of these results in the denominators of eq 1, this equation can be solved to obtain the flash-point temperature of the blend (common to all numerators). For the determination of the saturated vapor pressure of each component, the generic temperature (T) was replaced by the flash-point temperature of each component in eq 2:…”

Section: Prediction Of the Flash-point Temperaturementioning

confidence: 99%

“…This equation was used in some of the methods previously mentioned to determine the FP of flammable blends. − However, the difficulties for the determination of the concentrations in the gaseous phase led Liaw et al to propose a method to determine the concentrations in the gaseous phase from those in the liquid phase, based on the vapor–liquid equilibrium condition. ,,,,− Deviations with respect to ideal partial pressures can be accounted from the excess free enthalpy of the mixture, which is related to the activity coefficients. These coefficients can be obtained from a variety of methods such as those based on UNIFAC, ,,,,,, UNIFAC Dortmund, − Wilson, ,,, UNIQUAC, ,, NRTL ,, and those based on quantum chemistry …”

Section: Introductionmentioning

confidence: 99%

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Prediction of Flash-Point Temperature of Alcohol/Biodiesel/Diesel Fuel Blends

Álvarez

Lapuerta

Agudelo

2019

Ind. Eng. Chem. Res.

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Significant advances have been achieved in the last decades for predicting flash point, not only for pure substances but also for multicomponent fuels, even if they are complex nonideal mixtures. This is the case of blends of alcohols with diesel or diesel/biodiesel fuels. Prevention of hazards is necessary when a light and volatile alcohol such as ethanol or n-butanol (with increasing interest as diesel fuel components) is included in the fuel composition. However, an accurate modeling requires detailed knowledge of the diesel fuel components, which is not always available. In this work, a tailored two-option model is proposed, which can be use depending on the information available. If detailed information about the diesel fuel composition is available, a first method based on the Liaw equation is recommended. If not, an extended method based on the combination of the Liaw equation and the Gibbs−Duhem equation is proposed instead, with diesel fuel being represented by a three-component surrogate (one component belonging to each of the main diesel-component families). These two methods were compared with experimental flash-point results, and it was shown that the simplified method provides results as accurate as the complete method, and only if results for ethanol blends are considered unreliable, the complete method would be slightly more accurate. Both experimental and modeled results show that the rate of decrease of flash point is sharper for ethanol than for n-butanol, but the latter presents a more noticeable minimum flash-point behavior. However, the presence of biodiesel in the blends has the potential to neutralize both hazardous behaviors.

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Section: Experimental Protocol and Test Fuelsmentioning

confidence: 81%

Section: Experimental Protocol and Test Fuelsmentioning

confidence: 99%

Section: Prediction Of the Flash-point Temperature Of Alcohol/diesel ...mentioning

confidence: 99%

Section: Prediction Of the Flash-point Temperaturementioning

confidence: 99%