The present study examined the effects of ultrasonic radiation on the properties, structural parameters and fluidized catalytic cracking(FCC) performance of vacuum residue. We found that ultrasonic radiation markedly ...The present study examined the effects of ultrasonic radiation on the properties, structural parameters and fluidized catalytic cracking(FCC) performance of vacuum residue. We found that ultrasonic radiation markedly decreased the viscosity, carbon residue and average molecular weight, but slightly affected the density of vacuum residue. Besides, chromatographic analyses of SARA fractions revealed that asphaltene, resin and aromatic components were reduced, while saturates increased after ultrasonic radiation. Furthermore, FT-IR, ~1H-NMR, elemental analysis and VPO analysis indicated that the structural unit number(n), unit structure weights(usw), carbon fraction in aromatic structure(fA), naphthenic structure(fN) and naphthenic rings(RN) were decreased while the carbon fraction in paraffinic structures(fP) was increased. FCC showed an increased conversion rate(by 2.7%) and gasoline yield(by 3.7%). In sum, the ultrasonic radiation may facilitate and improve the secondary processing of vacuum residue.展开更多
To upgrade residual oil, the residual oil was subjected to ultrasonic treatment with an output of 800 W, at a temperature of 70 ℃ and at intervals ranging from 0 to 11 minutes. The experiment illustrated that 7 minut...To upgrade residual oil, the residual oil was subjected to ultrasonic treatment with an output of 800 W, at a temperature of 70 ℃ and at intervals ranging from 0 to 11 minutes. The experiment illustrated that 7 minutes of ultrasonic treatment reduced viscosity and carbon residue by 14.1% and 7.4%, respectively. This also produced an increase in saturates content and a decrease in the content of aromatics, resins and asphaltenes. Furthermore, the parameters of the average molecular structure were characterized by FT-IR, and ~1 H-NMR, while an increasingly greater change in the parameters were produced by an ultrasonic treatment interval of up to 7 minutes. The mechanical stirring and cavitation from ultrasonic treatment caused a series of changes in the molecules of residual oil. Microscopic changes affected the parameters of the average molecular structure, as usually shown in SARA fractions. The changes in the thermal reaction properties of residual oil after ultrasonic treatment were analyzed by thermogravimetry. As the ultrasonic treatment time increased, the apparent activation energy needed for pyrolysis decreased gradually, as did the temperature.展开更多
文摘The present study examined the effects of ultrasonic radiation on the properties, structural parameters and fluidized catalytic cracking(FCC) performance of vacuum residue. We found that ultrasonic radiation markedly decreased the viscosity, carbon residue and average molecular weight, but slightly affected the density of vacuum residue. Besides, chromatographic analyses of SARA fractions revealed that asphaltene, resin and aromatic components were reduced, while saturates increased after ultrasonic radiation. Furthermore, FT-IR, ~1H-NMR, elemental analysis and VPO analysis indicated that the structural unit number(n), unit structure weights(usw), carbon fraction in aromatic structure(fA), naphthenic structure(fN) and naphthenic rings(RN) were decreased while the carbon fraction in paraffinic structures(fP) was increased. FCC showed an increased conversion rate(by 2.7%) and gasoline yield(by 3.7%). In sum, the ultrasonic radiation may facilitate and improve the secondary processing of vacuum residue.
文摘To upgrade residual oil, the residual oil was subjected to ultrasonic treatment with an output of 800 W, at a temperature of 70 ℃ and at intervals ranging from 0 to 11 minutes. The experiment illustrated that 7 minutes of ultrasonic treatment reduced viscosity and carbon residue by 14.1% and 7.4%, respectively. This also produced an increase in saturates content and a decrease in the content of aromatics, resins and asphaltenes. Furthermore, the parameters of the average molecular structure were characterized by FT-IR, and ~1 H-NMR, while an increasingly greater change in the parameters were produced by an ultrasonic treatment interval of up to 7 minutes. The mechanical stirring and cavitation from ultrasonic treatment caused a series of changes in the molecules of residual oil. Microscopic changes affected the parameters of the average molecular structure, as usually shown in SARA fractions. The changes in the thermal reaction properties of residual oil after ultrasonic treatment were analyzed by thermogravimetry. As the ultrasonic treatment time increased, the apparent activation energy needed for pyrolysis decreased gradually, as did the temperature.
