Trevor M. Letcher

Liquid-liquid equilibria for mixtures of an alkanol + water + a methyl substituted benzene at 25°C

Abstract Letcher T.M. and Siswana P.M., 1992. Liquid-liquid equilibria for mixtures of an alkanol +water+a methyl substituted benzene at 25°C. Fluid Phase Equilibria, 74: 203-217. The tie-line and liquid-liquid equilibrium data are presented for mixtures of an alkanol + water + toluene or mesitylene at 25°C. The alkanols are methanol, ethanol, propanol, 2-propanol, butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol. The tie-lines and liquid-liquid equilibria for the systems 2-propanol + o-xylene or m-xylene + water were also measured. The results are compared with data for related ternary mixtures containing benzene, p-xylene, cyclohexane or hexane. The plait points were determined by both Treybals method and the Bachman method.

The excess volumes of decahydronaphthalene + cyclopentane, + cyclohexane, + cycloheptane and + cyclooctane at two temperatures

Abstract The excess volumes of decahydronaphthalene (decalin) + cyclopentane, + cyclohexane, + cycloheptane and + cyclooctane have been measured over the whole composition range at two temperatures. These measurements show many similarities to the V m E results of bicyclohexyl + a cycloalkane and 1,2,3,4-tetrahydronaphthalene (tetralin) + a cycloalkane.

Liquid-liquid equilibria for mixtures of an alkanol + diisopropyl ether + water at 25°C

Abstract Letcher, T.M., Ravindran, S. and Radloff, S., 1992. Liquid-liquid equilibria for mixtures of an alkanol + diisopropyi ether+water at 25°C. Fluid Phase Equilibria, 71: 177-188. The tie-lines and liquid-liquid equilibria are presented for mixtures of an alkanol + diisopropyl ether+water at 25°C. The alkanols are methanol ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol. Three three-parameter equations have been fitted to the results. These equations are compared and discussed in terms of statistical consistency.

Excess molar enthalpies of mixtures of a cycloalkane and an alkanol

Abstract The excess molar enthalpies, H m E , for the sixteen mixtures, (cyclo-C 5 H 10 + CH 3 OH) and (cyclo-C k H 2k + C 1 H 2l+1 OH) with k = 5, 6, 7, 8 and 10 and l = 2 and 3, were measured at 298.15 K. The H m E results are discussed in terms of the size of the cycloalkane ring and the length of the alkanol chain.

The molar excess enthalpies and volumes of 1-alkyne + methanol and + ethanol mixtures at 298.15 K

The excess enthalpies and volumes of 1-alkyne+methanol and 1-alkyne+ethanol mixtures have been measured at 298.15 K. The alkynes include 1-hexyne, 1-heptyne and 1-octyne. These measurements have been compared with the HEm and VEm values of n-alkane—methanol and n-alkane—ethanol mixtures. The HEm(maxima) for 1-alkyne−ethanol mixtures are between 100 and 200 J mol−1 more positive than the HEm(maxima) for n-alkane—ethanol mixtures. The VEm(maxima) for 1-alkyne−ethanol mixtures are, by contrast, less positive than the VEm(maxima) for n-alkane—ethanol mixtures. The partial molar excess enthalpies and volumes have been calculated and the results are discussed in terms of specific interactions.

Liquid-liquid equilibria for mixtures of an alkanol + methyl tert-butyl ether + water at 25° C

Abstract Letcher, T.M., Ravindran, S. and Radloff, S.E., 1991. Liquid-liquid equilibria for mixtures of an alkanol + methyl ( tert -butyl ether + water at 25 °C. Fluid Phase Equilibria , 69: 251-260. The tie line and liquid-liquid equilibria data are presented for mixtures of an alkanol + methyl tert -butyl ether + water at 25°C. The alkanols are methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol and 2 methyl-2-propanol. The results are compared with liquid-liquid equilibria data of related three-component systems in which the methyl tert -butyl ether is replaced by diethyl ether or by diisopropyl ether. The Hlavatý equation, a β-density function equation and a logarithmic γ equation have all been fitted to the liquid-liquid equilibria data.

Excess enthalpies of (a xylene + an alkanol) at 298.2 K

Abstract Excess molar enthalpies H m E were measured as a function of mole fraction at 298.2 K and atmospheric pressure for the 12 mixtures [ x {isomer of C 6 H 4 (CH 3 ) 2 } + (1 − x )C k H k +1 OH] where k = 1, 2, or 3. An LKB 2107 flow microcalorimeter was used in the measurements. The H m E s for these mixtures are discussed in terms of the position of the methyl groups and also in terms of the carbon chain length of the alkanol.

EXCESS ENTHALPIES AND VOLUMES OF BINARY MIXTURES OF 1-ALKENES WITH METHANOL AND WITH ETHANOL

Abstract Molar excess enthalpies H E m have been determined using an LKB flow calorimeter, and molar excess volumes V E m using a Paar DMA 601 densitometer over the whole composition range, for all the binary mixtures of 1-hexene, 1-heptene and 1-octene with methanol and with ethanol at 298.15 K. The results were compared with H E m and V E m values for mixtures of an n -alkane with methanol and with ethanol in order to determine the effect of the double bond in the 1-alkene with alcohol mixtures.

THE EXCESS ENTHALPY AND EXCESS VOLUME OF (1,3,5-TRIMETHYLBENZENE+AN ALK-1-YNE) AT THE TEMPERATURE 298.15 K

In this work we present excess molar enthalpies and excess molar volumes for (1,3,5-trimethylbenzene + an alkyne) at 298.15 K. These results are compared with previously reported results for (benzene + an alkyne) and show that the substituted methyl groups of the 1,3,5-trimethylbenzene have a significant effect on the excess molar enthalpies and volumes.

Excess enthalpies and volumes of mixing for mesitylene + alcohols at 298.15 K

Direct measurements have been made at 298.15 K of the enthalpy changes and volume changes on mixing mesitylene with each of the following alcohols: methanol, ethanol, 1-propanol and 2-propanol. n nThe HEm value for mesitylene + an alcohol is similar in magnitude to HEm for benzene + the same alcohol. The VEm for mesitylene + an alcohol, however, is significantly more positive than the VEm for benzene + the same alcohol.