Thermochemical Investigations of Nearly Ideal Binary Solvents. 3. Solubility in Systems of Nonspecific Interactions
Date: June 1977
Creator: Acree, William E. (William Eugene) & Bertrand, Gary L.
Description: This article discusses thermochemical investigations of nearly ideal binary solvents. Abstract: The simple model which has previously led to successful predictive equations for the partial molar excess enthalpy of a solute in nearly ideal binary solvents has been slightly modified for application to the partial molar excess Gibbs free energy (excess chemical potential) of the solute in these systems. Three predictive equations are derived and tested for their ability to predict solubility in mixed solvents from measurements in the pure solvents. The most successful equation involves volumetrically weighted interaction parameters for the excess Gibbs free energy relative to the Flory-Huggins entropy of mixing, and predicts solubility in 22 systems containing naphthalene, iodine, and stannic iodide as solutes with an average deviation of 1.5% and a maximum deviation of 4%, using no adjustable parameters.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152443/
Comment on the Prediction of Gas Chromatographic Retention Behavior with Mixed Liquid Phases
Date: September 1980
Creator: Acree, William E. (William Eugene) & Rytting, J. Howard
Description: This article comments on the prediction of gas chromatographic retention behavior with mixed liquid phases.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc146582/
Thermochemical Investigations of Gas-Liquid Chromatography. Partition Coefficients of Inert Solutes on Self-Associating Binary Solvent Mixtures
Date: April 1982
Creator: Acree, William E. (William Eugene)
Description: This article discusses partition coefficients of inert solutes on self-associating binary solvent mixtures. Abstract: A conventional nonelectrolyte solution model which has led to successful predictive equations for the partial molar excess properties of a solute in simple binary solvent systems is extended to include self-associating solvent components. An expression is developed and tested for its ability to describe gas-liquid partition coefficients in mixed solvents from measurements in the pure solvents. For n-hexane, n-heptane, and cyclohexane on blended mixtures of n-hexadecane and n-octadecane with N,N-dibutyl-2-ethylhexylamide, the newly derived expression is found to describe the chromatographic data to within 2%.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152444/
Solubility of Phenylacetic Acid in Binary Solvent Mixtures
Date: January 1985
Creator: Acree, William E. (William Eugene)
Description: This article discusses the solubility of phenylacetic acid in binary solvent mixtures. Abstract: Solubilities are reported for phenylacetic acid at 25.0 °C in binary mixtures of carbon tetrachloride with cyclohexane, n-heptane, n-octane, or isooctane and mixtures of cyclohexane with n-heptane or isooctane. The results are compared to the predictions of equations developed previously for solubility in systems of purely nonspecific interactions, with phenylacetic acid considered as either monomeric or dimeric molecules in solution. The dimer model provided the more accurate predictions and described the 15-fold range of solubilities in the carbon tetrachloride + isooctane system to within a maximum deviation of 15%.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152445/
Excess Molar Volumes of Binary Mixtures of Cyclohexane and y-Butyrolactone with Aromatic Hydrocarbons
Date: April 1985
Creator: Acree, William E. (William Eugene); Gholami, Kheirollah; McHan, Danny R. & Rytting, J. Howard
Description: This article discusses excess molar volumes of binary mixtures of cyclohexane and y-butyrolactone with aromatic hydrocarbons. Abstract: Excess molar volumes of cyclohexane + benzene, cyclohexane + toluene, cyclohexane + p-xylene, y-butyrolactone + benzene, y-butyrolactone + toluene, and y-butyrolactone + m-xylene have been measured at 298.15 K. For the first three systems, Vᴱ is positive throughout the entire concentration range. Vᴱ is negative for binary mixtures containing y-butyrolactone, which indicates significant interaction between y-butyrolactone and the aromatic hydrocarbon.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152457/
Experimental Artifacts and Determination of Accurate Py Values
Date: 1986
Creator: Street, Kenneth W. & Acree, William E. (William Eugene)
Description: This article discusses experimental artifacts and determination of accurate Py values. Abstract: Recently the Py solvent scale has been introduced and a large body of data has been generated using fluorescence measurements. Numerous problems exist in the correct determination of these values, including instrumental and chemical artifacts. Among the instrumental problems associated with correct Py assignments are slit width effects, inner filtering and efficiencies associated with double-pass vs. single-pass cell compartment designs. These instrumental problems, together with chemical artifacts related to adequate blank correction and temperature control, were investigated in the work reported in this paper.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152446/
Solubility of Pyrene in Binary Solvent Mixtures Containing Cyclohexane
Date: January 1987
Creator: Judy, Cheryl L.; Pontikos, Nicholas M. & Acree, William E. (William Eugene)
Description: This article discusses solubility of pyrene in binary solvent mixtures containing cyclohexane. Abstract: Solubilities are reported for pyrene at 26.0 °C in binary mixtures of cyclohexane with n-hexane, n-heptane, n-octane, isooctane, and cyclooctane. The results of these measurements are compared to the predictions of equations developed previously for solubility in systems of nonspecific interactions. The nearly ideal binary solvent (NIBS) model predicts these solubilities with a maximum deviation of 4.8%, using as input data the solubility of pyrene in each pure solvent. The NIBS model correctly predicts a small maxima for the mole fraction solubility of pyrene in cyclohexane + n-heptane mixtures.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152448/
Solubility of Anthracene in Binary Solvent Mixtures Containing Dibutyl Ether
Date: July 1987
Creator: Marthandan, Mary V. & Acree, William E. (William Eugene)
Description: This article discusses the solubility of anthracene in binary solvent mixtures containing dibutyl ether. Abstract: Experimental solubilities are reported for anthracene in binary solvent mixtures containing dibutyl ether with n-hexane, cyclohexane, n-heptane, methylcyclohexane, n-octane, isooctane, and cyclooctane at 25 °C. Results of these measurements, combined with estimates for the excess Gibbs free energies of the binary solvents, are used to test predictive expressions derived from the nearly ideal binary solvent (NIBS) model. Expressions based on a volume fraction average of solute properties in the two pure solvents predict anthracene solubilities to within a maximum deviation of 5.1% and an overall average deviation of 2.1%.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152449/
Solubility of Pyrene in Binary Solvent Mixtures Containing Dibutyl Ether
Date: January 1989
Creator: Wallach, Jordana R.; Tucker, Sheryl A.; Oswalt, Bridget M.; Murral, Debra J. & Acree, William E. (William Eugene)
Description: This article discusses the solubility of pyrene in binary solvent mixtures containing dibutyl ether. Experimental solubilities are reported for pyrene in binary solvent mixtures containing dibutyl ether with n-hexane, cyclohexane, n-heptane, methylcyclohexane, n-octane, isooctane, and tert-butylcyclohexane at 26 °C. Results of these measurements, combined with estimates for the excess Gibbs free energies of the binary solvents, are used to test predictive expressions derived from the nearly ideal binary solvent (NIBS) model. Expressions based on a volume fraction average of solute properties in the two pure solvents predict pyrene solubilities to within a maximum deviation of 10% and an overall average deviation of 3.2%.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc152453/
Polycyclic Aromatic Hydrocarbon Solute Probes Part II. Effect of Solvent Polarity on the Fluorescence Emission Fine Structures of Coronene Derivatives
Date: February 1989
Creator: Waris, Riaz; Rembert, Michael A.; Acree, William E. (William Eugene); Sellers, David M.; Street, Kenneth W. & Fetzer, John C.
Description: This article discusses the effect of solvent polarity on the fluorescence emission fine structures of coronene derivatives. Abstract: The fluorescence properties of coronene (Co), benzo[a]coronene (BCo), naphtho[2,3-a]coronene (NCo), dibenzo[a,j]coronene (DCo), naphtho[1,2,3,4-ghi]perylene, benzo[pqr]naphtho[8,1,2-bcd]perylene and dibenzo[cd,lm]perylene dissolved in solvents of varying polarity are reported. Measurements indicated that the emission intensities of the four coronene derivatives depended on solvent polarity. The Co, BCo and NCo scales have been defined as the ratio of the fluorescence intensities of bands I and III of the vibronic spectra. Band III of dibenzo[a,j]coronene was not clearly identifiable in all the solvents studied, and the DCo scale was therefore defined as the intensity ratio of band I and IV. Emission intensity ratios of the three perylene derivatives remained nearly constant, irrespective of solvent polarity.
Contributing Partner: UNT College of Arts and Sciences
Permallink:digital.library.unt.edu/ark:/67531/metadc157299/