Heat capacities of some organic liquids determined with the Picker flow calorimeter

Fortier, Jean‐Luc; Benson, George C.; Picker, Patrick

doi:10.1016/0021-9614(76)90108-7

Cited by 156 publications

(30 citation statements)

References 30 publications

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“…With this thermal feedback and the series connection between the two calorimetric cells, the measurement is independent of the flow of liquids, assuming that there is no mixing effect in the delay loop which may produce an expansion or a contraction of the liquids. As already observed by Fortier et al (13), this mixing effect may produce a significant error on the measured Ao. This situation is not unique to the heat capacity flow microcalorimeter but it is also valid in the present technique.…”

Section: Resultssupporting

confidence: 63%

Heat capacity measurements of liquids with a Picker mixing flow microcalorimeter

Simard¹,

Fortier²

1981

Can. J. Chem.

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The Picker mixed flow microcalorimeter has been used without modification as a differential thermal balance to measure the volumetric heat capacity of liquids. The precision on volumetric heat capacity change is evaluated to be ±0.5% or better, and the limit of detection is ± 5 × 10−5 J K−1 cm−3. As a check, the apparent molar heat capacities of an aqueous solution of NaCl in the range 0.01 to 6 mol kg−1 were measured at 298.15 K. The performance of this instrument is compared with that of the Picker heat capacity flow microcalorimeter.

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Section: Resultssupporting

confidence: 63%

Heat capacity measurements of liquids with a Picker mixing flow microcalorimeter

Simard¹,

Fortier²

1981

Can. J. Chem.

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“…Experimental results for the pure substances are summarized in Table 1, where some literature values (9)(10)(11)(12)(13)(14)(15)(16)(17) are given for comparison. Although small discrepancies are evident between the results from different sources, the overall agreement is satisfactory and attests to the reliability of our experimental techniques.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic properties of binary mixtures containing ketones. VIII. Heat capacities and volumes of some n-alkanone + n-alkane mixtures at 298.15 K

Grolier¹,

Benson²

1984

Can. J. Chem.

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. Can. J. Chem. 62, 949 (1984). Excess molar volumes, v: , and excess molar heat capacities at constant pressure, c: , , , have been obtained for some n-alkanone + n-alkane mixtures at 298.15 K from density and volu~netric heat capacity measurements using liquid-flow techniques. The c:,, data are much more accurate than those estimated from the temperature dependence of other thermodynamic properties (excess free energies and/or excess enthalpies). The rather unusual composition dependence of the excess heat capacities -two minima, or W-shape curves -is most likely due to cooperative induced conformational molecular "arrangements" in these mixtures. Binary n-alkanone + n-alkane mixtures have been investigated fairly extensively from a thermodynamic point of view. For our part, we have measured a number of heats of mixing, and recently we published two review papers (1, 2) analysing the information available in the literature about the thermodynamic properties of this class of mixtures in terms of a quasi-chemical group contribution model. Surprisingly, no data could be found for their heat capacities. This lack of information, and our interest in binary liquid mixtures having an n-alkane as one component and a simple organic compound as the other, prompted us to investigate the excess molar heat capacity at constant pressure, c:, , , of n-alkanone + n-alkane E mixtures. C,,, is of importance since it is related to the structures of the pure component liquids and their variation when the liquids are mixed.The present paper reports c:,, and excess molar volumes, v:, both at 298.15 K , for binary mixtures of methylethylketone (MEK, or 2-butanone) with n-heptane, n-dodecane, and n-tetradecane, and of diethylketone (DEK, or 3-pentanone) with n-heptane. In addition, V: is reported for MEK + ndecane at 298.15 K. Experimental Component liquidsSources of the primary materials were as follows: methylethylketone and diethylketone (Certified Grade reagents) from Fisher Scientific Co., n-heptane (stated purity 2 99.5 mol%), n-decane (stated purity 2 99 mol%), n-dodecane (stated purity 2 9 9 mol%), and 11-tetradecane (stated purity 2 99.5 mol%) from Fluka. The two ketones were purified chromatographically using a column packed with Chromosorb P (60/80 mesh) containing 25 mass % Apiezon L. The alkanes were used without further purification. Prior to the experi-I NRCC No. 22772. This work is a contribution to the TOM project (ref. 32). mental measurements, the component liquids were carefully dried with molecular sieve beads (Union Carbide Type 4A) from Fluka. Density and heat capacity measurementsBinary mixtures were prepared by weighing. Densities, p, of the pure liquids and their mixtures were determined with a vibrating-tube densimeter (3) from Sodev (Model 02D). Before each series of measurements, the instrument was calibrated using a vacuum and degassed doubly distilled water: p(298.15 K) = 997.047 kg m-3 (4). Excess molar volumes were obtained from the density p of the mixture according to the relationwhere V,, Mi, and p...

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“…A Heto circulating thermostat (type 04 PT 623) maintained the temperature constant to within 0.01 K. Bi-distilled water and heptane were used as calibrating substances. (7,8) Calibration was carried out before each measurement under the same temperature and pressure conditions. Densities were measured with a precision of 3·10 −2 kg·m −3 .…”

Section: Methodsmentioning

confidence: 99%

Excess volumes for (tetrahydrofuran + heptane + heptan-1-ol or octan-1-ol) at the temperature 298.15 K

Lorenzo

Castro

Pintos

et al. 1995

The Journal of Chemical Thermodynamics

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Heat capacities of some organic liquids determined with the Picker flow calorimeter

Cited by 156 publications

References 30 publications

Heat capacity measurements of liquids with a Picker mixing flow microcalorimeter

Heat capacity measurements of liquids with a Picker mixing flow microcalorimeter

Thermodynamic properties of binary mixtures containing ketones. VIII. Heat capacities and volumes of some n-alkanone + n-alkane mixtures at 298.15 K

Excess volumes for (tetrahydrofuran + heptane + heptan-1-ol or octan-1-ol) at the temperature 298.15 K

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