Specific retention volumes for C5–C12 alkane solutes in the series of homologous n-alkanes, n-C28, n-C32 and n-C36 and squalane

Pease, E.C.; Thorburn, S.

doi:10.1016/s0021-9673(00)84167-9

Cited by 26 publications

(12 citation statements)

References 13 publications

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“…However, at 100" and 12OoC, there was a systematic deviation of this data from that of Pease and Thorburn with the Vg values being consistently less than the literature values (37). However, Tewari et al published Vg values at 76.0", 80.0", 84.0", and 88.OoC, and a linear extrapolation of this data is in excellent agreement with our data at 100" and n-C24 n-C30 n-C36 Solute Young ( 4 5 ) and Tewari et at.…”

Section: Discussioncontrasting

confidence: 57%

Specific retention volumes and limiting activity coefficients of C4-C8 alkane solutes in C22-C36 n-alkane solvents

Parcher¹,

Weiner²,

Hussey³

et al. 1975

J. Chem. Eng. Data

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The specific retention volumes of 21 hydrocarbon solutes are measured on eight liquid phases at 80", loo", and 120°C. The infinite dilution activity 7oefficients and heats of solution are presented and compared with literature data.The basic physical process responsible for retention of a solute in gas-liquid partition chromatography is the partition of a solute or solutes between the gas and liquid phases. Because of this fact, much of the thermodynamic information attainable from a normal (static) solubility or vapor-pressure measurement is also obtainable from gas chromatographic retention volume measurements. In particular, numerous authors (7-4, 6, 8 , 77, 74-79, 25, 26, 28, 3 7 , 38, 3 9 ) have measured infinite dilution activity coefficients and/or other thermodynamic data such as heat of solution, entropy of solution, and partial molar excess enthalpies and entropies.Hydrocarbon systems have been studied extensively by this method. The activity coefficients of C4-Ca hydrocarbon solutes in n-hexadecane, n-heptadecane, and n-octadecane have been measured at lower temperatures (5, 73, 33, 4 7 ) . The normal hydrocarbons in the range c2O-c36 at higher temperatures ( >6O0C) have been studied by several investigators ( 2 0 , 32, 42, 4 5 ) ; however, the studies have been limited in scope, and there is little overlap of the data sets. Hicks and Young ( 2 0 ) studied n-butane, n-pentane, and n-hexane on n-tetracosane and n-octacosane; however, each measurement was at a separate temperature so that little correlation of this data is possible because of the temperature dependence of the activity coefficients in low-molecular-weight solvents at low temperatures. For higher molecular-weight systems at higher temperatures, the activity coefficient is generally independent of temperature, because of low values for the partial molar excess enthalpy of these systems. However, at lower temperatures the activity coefficients generally decrease with increasing temperatures; therefore, it is not advisable to compare data sets at different temperatures for low-molecular-weight systems.Martire and Pollara ( 3 2 ) , Young ( 4 5 ) , and Tewari et al. ( 4 2 ) all reported activity coefficient data for one or more solvents in the range 8O-12O0C, and this literature data will be compared with the results of this report in the Discussion section.Pease and Thorburn ( 3 7 ) have published V, data for 27 alkane solutes on n-octacosane, n-dotriacontane, and n-hexatriacontane at 8O.Oo, 100.0", and 120.0"C. This set of Vg data was used as a reference point for our Vg values, and the comparison will be given in the Discussion section.In many cases, the activity coefficients and heats of solution have been compared with data obtained from static isotherm, vapor pressure, or solubility data. The general conclusions ( 7 2 , 40, 4 3 ) are that the accuracy of the limiting activity coefficients and heats of solution are ' To whom correspondence should be addressed compatible with static data, and that the chromatographic approach offers sev...

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Section: Discussioncontrasting

confidence: 57%

Specific retention volumes and limiting activity coefficients of C4-C8 alkane solutes in C22-C36 n-alkane solvents

Parcher¹,

Weiner²,

Hussey³

et al. 1975

J. Chem. Eng. Data

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“…Assuming kg(O 2 )skg(H 2 O)=3000 cm h" 1 and taking K,(0 2 ) s20cm h" 1 , substitution into Eq. (15) shows that for this gas ri>r g ,so that ki(H2O)=20cm h" .Similar calculations demonstrate that for all sparingly soluble gases which are not chemically reactive in the aqueous phase (e.g. N2 and the noble gases) virtually all resistance to interfacial transfer comes from the liquid phase.…”

Section: (B) Liquid Phase Resistance (Ri)mentioning

confidence: 52%

“…In the last few years the gas chromatography has been used extensively for physicochemical measurements. A large number of books and research papers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] deal with the possibility of fulfilling such measurements.…”

Section: Physicochemical Measurements By Gas Chromatographymentioning

confidence: 99%

“…air)/Equilibrium concentration of unionized dissolved gas in liquid phase (g cm" water], Eqs ( 10) and ( 11 (15) Eqs. ( 14) and (15) show that total resistance, R, on either a gas phase (\/K g ) or liquid phase {MKj) basis, is dependent on the individual values of ki and k g and Henry's law constant for the gas in question.…”

Section: Gas-liquid Interfacementioning

confidence: 99%

“…In using equations such as (15), \/k/ may be written as η and \IHk g as r g , whence R,=r,+r g (16) So that the numerical values of /-/ and r g give the relative importance of the liquid and gas phases controlling the exchange of the gas concerned. Provided values of r/ and r g are known for any particular gas, Eq.…”

Section: Gas-liquid Interfacementioning

confidence: 99%

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Development of new chromatographic methods for the study of exchange of pollutants between the atmosphere and the water environment

Atta¹

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C Evaporation of liquids 13.1 Introduction 13.2 Determination of rate coefficients for the evaporation of ethanol and 1,1,1 trichloroethane into carrier gas, under the influence of various monolayer thicknesses of Triton X-100 13.3 Determination of rate coefficients for the evaporation of ethanol and 1,1,1 trichloroethane into carrier gas, under the influence of different free surface areas of the liquid 174 ΧΉ CONCLUSIONS 177 A Diffusion of a gas into pure gases and gas mixtures 1 Determination of diffusion coefficients of analyte gases(CO,CC>2) into pure gases(H2,He) and mixtures of these gases with various percentage composition 2 Estimation of the composition of binary gas mixtures 177 Β Transport of a gas into a liquid phase 179 1 Determination of mass transfer coefficients of gases in liquids and of distribution coefficients of gases at the gas-liquid interface 179 2 Determination of diffusion coefficients of gases into liquids, of partition coefficients of gases between liquids(at the interface and the bulk) and gases, of overall mass transfer coefficients of gases in the carrier gas and liquid, of gas and liquid film transfer coefficients of gases, of gas and liquid phase resistances for the transfer of gases into liquids and of thicknesses of stagnant film in the liquid phase, according to the two-film theory of Whitman 180 (a) Transfer of vinyl chloride into the water body (b) Effects of surfactants on the interaction of vinyl chloride with . 0 . loi water C Evaporation of liquids 182 1 Determination of rate coefficients for the evaporation of ethanol and 1,1,1 trichloroethane into carrier gas under the influence of various monolayer thicknesses of Triton X-100 2 Determination of rate coefficients for the evaporation of ethanol and 1,1,1 trichloroethane into carrier gas under the influence of different free surface areas of the liquid

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Partial molar excess free enthalpies of n‐alkenes in apiezon M and alkanes in squalane and polydimethylsiloxane, and the solution theories of prigogine and flory: An investigation by gas chromatography

Hammers

Bos

Vaas

et al. 1975

J. Polym. Sci. Polym. Phys. Ed.

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Partial molar excess free enthalpies (or excess chemical potentials) at infinite dilution were obtained over a large temperature range by gas chromatography. Data on n‐alkenes in Apiezon M are interpreted by the Prigogine–Patterson theory; data on normal and branched alkanes in squalane and polydimethylsiloxane (PDMS) are discussed in terms of the Prigogine–Patterson theory and the solution theory of Flory, Orwoll, and Vrij. For the alkane–PDMS systems heats of dilution and partial excess heat capacity data are given. The aim of this work is to get some insight in the applicability of these solution theories to mixtures of fluids, the properties of which may slightly violate the basic assumptions of these theories. It is shown that orientational order in and a large cross‐sectional chain diameter of the polymer solvent do not affect their applicability to the partical molar excess free enthalpies of apolar mixtures, whereas large dissimilarities between the force fields around the segments of the mixture components and/or dissimilar chain flexibilities detract from the applicability of these theories (alkanes in PDMS). Special attention has been paid to the effects of dissimilar size and shape of the segments of the mixture compounds on the magnitude of the interchange interaction parameter. It is shown that the multiple‐connected segment model after Lichtenthaler et al. does not warrant a reliable combinatorial contribution. Comparison of the interaction parameters obtained for n‐alkanes in n‐alkanes, Apiezon, squalane, and polyisobutylene and for branched alkanes in squalane reveals that the magnitude of this parameter is affected by small end‐effects due to the relative weakness of methyl‐methylene interactions.

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Specific retention volumes for C5–C12 alkane solutes in the series of homologous n-alkanes, n-C28, n-C32 and n-C36 and squalane

Cited by 26 publications

References 13 publications

Specific retention volumes and limiting activity coefficients of C4-C8 alkane solutes in C22-C36 n-alkane solvents

Specific retention volumes and limiting activity coefficients of C4-C8 alkane solutes in C22-C36 n-alkane solvents

Development of new chromatographic methods for the study of exchange of pollutants between the atmosphere and the water environment

Partial molar excess free enthalpies of n‐alkenes in apiezon M and alkanes in squalane and polydimethylsiloxane, and the solution theories of prigogine and flory: An investigation by gas chromatography

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