000			02102nab a2200205 4500
005			20260520000902.0
008			260224s2010 xxu
245	0	0	_aDistribution of acids and neutral nitrogen compounds in a chinese crude oil and its fractions: characterized by negative-ion electrospray ionization fourier transform ion cyclotron resonance mass spectrometry
260			_a _b _cjul./ago. 2010
270			_a19/11/2010 ; 19/11/2010
300			_a7 p. ; 4005–4011
520			_aTranscripción del resumen del autor. A Chinese crude oil was distilled into multiple narrow boiling fractions. The crude oil, 39 narrow distillate fractions (up to 560 °C), and atmospheric and vacuum residues were analyzed using negative electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS). The heteroatoms, N1, N2, N1O1, N1O2, O1, and O2 class species, were identified and characterized by double-bond equivalent (DBE) values and carbon numbers. The composition of crude oil was correlated with increased boiling point. Most abundant O1 and O2 class species had DBE values and carbon numbers corresponding to biological skeleton structures, such as hopanoic acid, secohopanoic acid, and sterol. The distribution of acids and neutral nitrogen compounds in the various fractions were determined. At higher carbon numbers, the amount of the compounds and DBE values increased gradually with the boiling point for most oil fractions. The abundant N1 class species were centered at DBE values of 9, 12, 15, and 18. These were likely pyrrolic compounds with various numbers of aromatic rings. Species such as hopanoic acids and secohopanoic acids were highly abundant in fractions above 500 °C. Sterol-like compounds were enriched in the 460-500 °C fractions. These are likely the major species causing a high total acid number (TAN) in the crude oil.
581			_a4
773	0		_tEnergy & fuels _g24
942			_cARTICULO
100	1		_aShi, Quan _942416
100	1		_aZhao, Suoqi _926203
100	1		_aXu, Zhiming _926204
999			_c172023 _d172023