Measurement of total acid number (TAN) and TAN boiling point distribution in petroleum products by electrospray ionization mass spectrometry

Analytical Chemistry
K QianWilliam N Olmstead

Abstract

We report a new method for rapid measurement of total acid number (TAN) and TAN boiling point (BP) distribution for petroleum crude and products. The technology is based on negative ion electrospray ionization mass spectrometry (ESI-MS) for selective ionization of petroleum acid and quantification of acid structures and molecular weight distributions. A chip-based nanoelectrospray system enables microscale (<200 mg) and higher throughput (20 samples/h) measurement. Naphthenic acid structures were assigned based on nominal masses of a set of predefined acid structures. Stearic acid is used as an internal standard to calibrate ESI-MS response factors for quantification purposes. With the use of structure-property correlations, boiling point distributions of TAN values can be calculated from the composition. The rapid measurement of TAN BP distributions by ESI is demonstrated for a series of high-TAN crudes and distillation cuts. TAN values determined by the technique agree well with those by the titration method. The distributed properties compare favorably with those measured by distillation and measurement of TAN of corresponding cuts.

Citations

Feb 14, 2012·Applied Biochemistry and Biotechnology·Sangeeta Negi, Sunil Kumar
Nov 8, 2008·Journal of the American Society for Mass Spectrometry·Sunghwan KimAlan G Marshall
Aug 5, 2008·Mass Spectrometry Reviews·John V HeadleyMark P Barrow
Feb 18, 2010·International Journal of Artificial Intelligence Tools : Architectures, Languages, Algorithms·Eli Peli, Russell L Woods
May 8, 2013·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·J V HeadleyF J Wrona
Feb 26, 2009·Environmental Science & Technology·Richard A FrankKeith R Solomon
May 3, 2011·Analytical Chemistry·Ryan P Rodgers, Amy M McKenna
Jun 17, 2020·Analytical Chemistry·Seungwoo SonSunghwan Kim

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