Measurement of the wax appearance temperatures of crude oils by temperature modulated differential scanning calorimetry

Z. Jiang, J. M. Hutchinson, Corrie Thomas Imrie

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Abstract

Temperature modulated differential scanning calorimetry (TMDSC) is used for the first time to measure the wax appearance temperature (WAT) of crude oil samples. The commercial implementation of TMDSC chosen for this study is alternating differential scanning calorimetry (ADSC) marketed by Mettler-Toledo. We show that changes in the ADSC signals exhibit excellent correlations with WATs measured using conventional differential scanning calorimetry, DSC. For oil samples having low wax contents, ADSC is a more sensitive technique for identifying the onset of wax crystallisation and, specifically, the phase angle between the heating rate and heat how modulations is extremely sensitive to this process. (C) 2001 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)367-371
Number of pages5
JournalFuel
Volume80
Issue number3
Early online date22 Dec 2000
DOIs
Publication statusPublished - Feb 2001

Keywords

  • wax appearance temperature
  • temperature modulated differential scanning calorimetry
  • crude oils

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