000			02083nab a2200193 4500
005			20260520000828.0
008			260224s2009 xxu
245	0	0	_aTrapping of paraffin and other compounds by asphaltenes detected by laser desorption ionization - Time of flight mass spectrometry (LDI-TOF MS) _bRole of A1 and A2 asphaltene fractions in this trapping
260			_a _b _cene. 2009
270			_a27/07/2009 ; 27/07/2009
300			_a6 p. ; 842-848
520			_aTranscripción del resúmen publicado por el autor: Trapping of compounds by asphaltenes in guest-host complexes (GHC) is an important phenomenon relevant to many properties of the system, such as asphaltene structure, swelling and solvent trapping, geochemical impact, as well as the trapping of metalloporphyrins, free radicals, resins, and other crude oil components, such as, e.g., paraffin. Several trapping mechanisms, such as adsorption and occlusion, during asphaltene separation from crude oil can be considered, but most interest is attracted to GHC, in which the guest is firmly bound and cannot be completely liberated from the host by solvent extraction. An example of such trapping is presented, with the guest being paraffinic and other resin-like compounds hereafter called trapped compounds (TCs). TCs were isolated from asphaltenes by the partition of the asphaltene sample in fractions A1 (toluene insoluble) and A2 (toluene soluble). A small quantity (about 8%) of a heptane-soluble TC fraction was isolated along with the A2 fraction. The presence of TCs in asphaltenes and their absence in fractions A1 and A2 were detected by means of laser desorption ionization-time of flight mass spectrometry (LDI-TOF MS) in the 450-600 molecular-mass range. These finding suggests that the TC sample is probably trapped in a network formed by both A1 and A2 fractions.
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aAcevedo, Sócrates _934504
100	1		_aCordero, Josmelith M. _941607
100	1		_aCarrier, Herve _941608
999			_c170204 _d170204