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Asphaltenes : chemical transformation during hydroprocessing by Jorge Ancheyta

By Jorge Ancheyta

Designed for scientists operating for petroleum and catalyst businesses, this article re-examines the characterization and conversion of asphaltenes.

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Tech. 25 (1-2): 105–119. 50 Asphaltenes, wt% where Y is the desired property (wt% of precipitated asphaltenes; wt% of C, H, N, and S; and wppm of Ni and V), T is the temperature (°C), P is the precipitation pressure (kg/cm 2), and A, B, C, D, and E are correlation constants. According to this equation, temperature is the variable that influences in deeper sense all properties of asphaltenes, which agrees with experimental information. 3 for the yield of asphaltenes. 15 Comparison of experimental and predicted asphaltene contents in CO-1 crude oil: () experimental, (lines) predicted.

Thus, the higher the boiling point of the cut, the higher the aromatic content. Multiring cycles can also be analyzed by GC-MS; however, the main issue is the amount of material that remains as nonvolatile residue. When asphaltenes are characterized by GC-MS, not all the sample is volatile as pointed out by Pillon (2001), who found that only 74 wt% of the sample was analyzed. , 2005). Rodrigues Coelho et al. (2007) have demonstrated the existence of a linear correlation in the infrared (IR) intensities of the symmetric and asymmetric aromatic hydrogens in methylsubstituted arenes, in the 2,900 to 3,100 cm−1 region, and of the out-of-plane deformation in the 700 to 900 cm−1 region.

25 (1-2): 105–119. ) Centeno et al. (2004) evaluated the precipitation of asphaltenes in a pressurized system adapted with stirring and heating. Two pressures were studied at four temperatures keeping constant the solvent-to-oil ratio, stirring rate, and contact time. Conditions for precipitating asphaltenes were: pressure of 15 and 25 kg/cm2; temperature of 40, 60, 80, and 100°C; stirring rate of 750 rpm; contact time of 30 min; and solvent-to-oil ratio of 5:1 (mL/g). 1. It can be observed that almost the same asphaltenes properties are obtained with the standard method (atmospheric pressure and 10 h contact time) and the pressurized system at the following precipitation conditions: pressure of 25 kg/cm2, temperature of 60°C, stirring rate of 750 rpm, solvent-to-oil ratio of 5:1, and contact time of 30 min.

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