Molecular energetics of 4-methyldibenzothiophene: An experimental study

abstract

The standard (p degrees = 0.1 MPa) molar enthalpy of formation of 4-methyldibenzothiophene, in the gaseous phase, at T = 298.15 K, was derived from the combination of the values of the standard molar enthalpy of formation, in the crystalline phase, at T = 298.15 K, and the standard molar enthalpy of sublimation, at the same temperature. The standard molar enthalpy of formation in the crystalline phase, determined from the standard massic energy of combustion, in oxygen, is (70.9 +/- 4.8) kJ . mol(-1) and was measured by rotating-bomb combustion calorimetry. From Calvet microcalorimetry measurements, the standard molar enthalpy of sublimation obtained is (90.3 +/- 0.7) kJ . mol(-1). (C) 2009 Elsevier Ltd. All rights reserved.

keywords

BOMB CALORIMETRY; SULFUR-COMPOUNDS; HYDRODESULFURIZATION; DIBENZOTHIOPHENE; REACTIVITIES; THERMOCHEMISTRY; ENTHALPIES; COMBUSTION; CRUDE; OILS

subject category

Thermodynamics; Chemistry

authors

Freitas, VLS; Gomes, JRB; da Silva, MDMCR

our authors

acknowledgements

Thanks are due to Fundacao para a Ciencia e Tecnologia (FCT), Lisbon, Portugal, for financial support to Centro de Investigaicao em Quimica - UP and CICECO. V.L.S. Freitas thanks FCT and European Social Fund for the award of a Ph.D. Research Grant (SFRH/BD/41672/2007).

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