Using the Vapor Pressure of Pure Volatile Organic Compounds to Predict the Enthalpy of Vaporization and Computing the Entropy of Vaporization

Abernathy, Shawn M.; Brown, Kelly R.

doi:10.4236/oalib.1101927

Cited by 4 publications

(18 citation statements)

References 10 publications

(5 reference statements)

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“…A linear square regression fit was also applied to literature VP data of iso-octane [7]. This plot is shown in Figure 4 along with n-octane linear square regression fit of its empirical VP data.…”

Section: Resultsmentioning

confidence: 99%

“…These units of temperature and pressure were chosen to be consisted with the literature in which they were compared. A detailed illustration of the enhanced VP acquisition system was depicted in a prior publication in this journal [7].…”

Section: /11mentioning

confidence: 99%

“…This type of meticulous evaluation is necessary to ensure the reliability of the methodology and empirical results generated from this novel system. The VP data (water, ethanol, and toluene) and the computed thermodynamic data presented in an earlier paper are incorporated in this investigation due to coinciding data collection intervals [7].…”

Section: Introductionmentioning

confidence: 99%

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Predicting the Enthalpy of Vaporization and Calculating the Entropy of Vaporization of 87 Octane Gasoline Using Vapor Pressure

Abernathy¹,

Brown²

2016

OALib

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The vapor pressure (VP) of 87 grade gasoline was measured using an enhanced VP acquisition system over a temperature range of approximately 19.0˚C (292.2 K) and 69.0˚C (342.2 K). The empirical data were used to predict the thermodynamic entities the enthalpy of vaporization (ΔH vap) and the entropy of vaporization (ΔS vap) of gasoline. The results of this investigation yielded a ΔH vap value of 35.1 kJ/mol and ΔS vap of 102.5 J/mol•K. The value of ΔH vap was in excellent agreement with the findings of a prior study (Balabin et al., 2007), which produced a ΔH vap values of 37.3 kJ/mol and 35.4 kJ/mol. The enthalpy and entropy of vaporization of n-heptane (37.2 kJ/mol and 100.1 J/mol•K) and n-octane (39.1 kJ/mol and 98.3 J/mol•K) were also determined after acquiring VP data for the two VOCs. The empirical results for n-heptane and n-octane were also in excellent agreement with the literature. These favorable comparisons strengthen the capacity of our system for acquiring the VP data for pure and volatile multi-component mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: /11mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting the Enthalpy of Vaporization and Calculating the Entropy of Vaporization of 87 Octane Gasoline Using Vapor Pressure

Abernathy¹,

Brown²

2016

OALib

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“…At a minimum, nine VP data measurements (totaling 3 min) were acquired in this work to ensure reproducibility of the data before adjusting the DVR and DTC to their next set point. 1,2 The resultant VP data can be easily processed in excel or exported for processing using a different software package for evaluation. 2…”

Section: Experimental Methodology and Proceduresmentioning

confidence: 99%

“…Upon attending an exposition at an ACS meeting, I noticed the J-KEM Scientific vendor table. They manufactured a digital temperature controller (DTC) and a digital vacuum regulator (DVR) that could be interfaced with a PC. , At this time, I had no research grants, but I was a research mentor for an undergraduate student in the Washington Baltimore Hampton Road Louis Stokes Alliance for Minority Participation Program at Howard University. This program is funded by the NSF, and Dr. Clarence M. Lee is the Executive Director.…”

Section: Introductionmentioning

confidence: 99%

Calculating the Enthalpy of Vaporization of Ethanol, n-Heptane, Isooctane, and a Binary Mixture of Isooctane + n-Heptane from Their Vapor Pressure Data

2023

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Conspectus A key physical property of volatile liquids is vapor pressure (VP). Volatile organic compounds (VOCs) are a classification of compounds directly associated with low boiling points, high rates of evaporation, and high flammability. The majority of chemists and chemical engineers were directly exposed to the odor of simple ethers, acetone, and toluene in the air while taking an organic chemistry laboratory course as an undergraduate student. These are just a few examples of the numerous VOCs produced by the chemical industry. When toluene is poured into a beaker from its reagent bottle, its vapors readily evaporate at ambient temperature from this open container. When the cap is securely placed back on the reagent bottle of toluene, a dynamic equilibrium develops and exists in this closed environment. This chemical concept is known as a vapor–liquid phase equilibrium. A crucial physical property of spark-ignition (SI) fuels is high volatility. In the United States, most of the vehicles traveling on the road today have SI engines. Gasoline is the fuel used to power these engines. It is a major product manufactured by the petroleum industry. This fuel is petroleum based since it is a refined product of crude oil consisting of a mixture of hydrocarbons, additives, and blending agents. Thus, gasoline is homogeneous solution of VOCs. The VP as a function of temperature of a pure VOC can readily be measured using an ebulliometer. The VP is also known in the literature as the “bubble point pressure”. In this investigation, the VP as a function of temperature was acquired for the VOCs ethanol, isooctane (2,2,4-trimethylpentane), and n-heptane. The latter two VOCs are primary reference fuels components found in 87, 89, and 92 grade gasoline. Ethanol is an oxygenate additive of gasoline. The VP of a homogeneous binary mixture of isooctane and n-heptane was also acquired using the same ebulliometer and methodology. In our work, an enhanced ebulliometer was used to collect the VP data in our work. It is known as the vapor pressure acquisition system. The devices that comprise the system automatically acquire the VP data and log it into an excel spreadsheet. The data are readily transformed into information to compute the heat of vaporization (ΔH vap ). The results described in this Account compare quite favorably to the literature values. This validates our system for performing fast and reliable VP measurements.

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Negative axicon tip-based fiber optic interferometer cavity sensor for volatile gas sensing

et al. 2019

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Using the Vapor Pressure of Pure Volatile Organic Compounds to Predict the Enthalpy of Vaporization and Computing the Entropy of Vaporization

Cited by 4 publications

References 10 publications

Predicting the Enthalpy of Vaporization and Calculating the Entropy of Vaporization of 87 Octane Gasoline Using Vapor Pressure

Predicting the Enthalpy of Vaporization and Calculating the Entropy of Vaporization of 87 Octane Gasoline Using Vapor Pressure

Calculating the Enthalpy of Vaporization of Ethanol, n-Heptane, Isooctane, and a Binary Mixture of Isooctane + n-Heptane from Their Vapor Pressure Data

Negative axicon tip-based fiber optic interferometer cavity sensor for volatile gas sensing

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