000			01973nab a2200229 4500
005			20260520000954.0
008			260224s xxu
245	0	0	_aImpact of multiphase behavior on coke deposition in a commercial hydrotreating catalyst under sedimentation conditions
270			_a04/12/2008 ; 06/09/2005
300			_a7 p.
520			_aTRANSCRIPCIÓN DEL RESUMEN PUBLICADO POR EL AUTOR: Coke deposition in heavy oil catalytic hydroprocessing remains a serious problem. The influence of multiphase behavior on coke deposition is an important but unresolved question in this literature. A model mixture comprising Athabasca vacuum bottoms (ABVB) + decane + hydrogen which is shown to exhibit low-density liquid + vapor, high-density liquid + vapor, as well as low-density liquid + high-density liquid + vapor, phase behavior at typical hydroprocessing conditions and a commercial heavy oil hydrotreating catalyst (NiMo/ -Al2O3) were employed in this investigation. The influence of multiphase behavior on coke deposition was explored under catalyst coking conditions (380 °C and 2 h). The liquid-liquid-vapor region extends from ~20% ABVB to ~50% ABVB. Coke deposition in the high-density liquid phase was found to be greater than in the low-density liquid phase, at fixed global composition. Conventional kinetics models which do not include the impact of such phase behavior effects cannot account for local maxima in the coke deposition versus coke precursor concentration profiles that result when complex phase behavior is encountered.
773	0		_tEnergy & fuels _gVol. 19, no. 4 (jul.agos. 2005) ; p. 1405-1411
942			_cARTICULO
100	1		_aZhang, Xiaohui _947287
100	1		_aChodakowski, Martin _947288
650		0	_aDeposición de sólidos _947284
650		0	_aCatálisis _92782
650		0	_aBitúmenes _91580
650		0	_aPetróleos pesados _922736
700	1		_aChodakowski, Martin _947288
999			_c178026 _d178026