Thermal Data on Organic Compounds. XVIII. The Heat Capacity and Entropy of t-Butylethylene

Kennedy, W. D.; Shomate, C. Howard; Parks, George S.

doi:10.1021/ja01273a503

Cited by 8 publications

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“…(entropy units) per mole. In a later article Parks, Shomate, Kennedy, and Crawford (19) reconsidered the method of extrapolation and recommended that the originally published values be increased by 10 per cent of the extrapolated portion. These corrections are as follows: butane 1.2, pentane 1.4, hexane 1.5, heptane 1.7, octane 1.8, nonane 2.0, decane 2.2, undecane 2.4, dodecane 2.5 E. U. per mole.…”

Section: Normal Paraffinsmentioning

confidence: 99%

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Thermodynamic Properties of Paraffins and Olefins

Ewell¹

1940

Ind. Eng. Chem.

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By extrapolation of experimental data on the entropies and heats of formation of the lower hydrocarbons, a set of rules is deduced for estimating the entropy and heat of formation of any paraffin or olefin hydrocarbon at 25°C. These properties are tabulated for all paraffins through the octanes and for all olefins through the hexenes.These values can be used to calculate the approximate state of equilibrium in any hydrocarbon reaction. The equilibrium proportions of 2,3-dimethyl-l-butene, 3,3dimethyl-l-butene, and 2,3-dimethyl-2-butene at 300°C. are calculated to be 25.4:2.2:72.4, compared to Whitmore's experimental ratio of 31:3:61. Equilibrium calculations for the paraffins show that in the temperature range 150°to 175°C. all the isomers in any group of isomers have approximately the same free energy. The more highly branched isomers are more stable below this temperature range, and the straight-chain and less highly branched ones are more stable above this temperature range.

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Section: Normal Paraffinsmentioning

confidence: 99%

“…A test of the estimated entropies in Table IV can be made using the data of Parks and co-workers (10,20) and the methods described in connection with the similar test in Table III. Table VIII shows the results of this test.…”

Section: Branched and Nonterminal Olefinsmentioning

confidence: 99%