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Effect of resin and asphaltene content present on the vacuum residue on the yield of delayed coking products

Abstract:

The effect of resin and asphaltene concentration in the feed, on the yield of delayed coking products was assessed, feeding controlled concentrations of the groups: Saturates, aromatics, resins and asphaltenes (SARA) (50-100%w/w of asphaltene or resin and a fixed mass ratio of the others groups) prepared from a Venezuelan vacuum residue. The results of yield of products obtained in a laboratory-scale process show, that the increases of concentration of resins or asphaltenes raise yield of coke and decreases the not-condensable. The distillates yield remained at levels close to zero (<1%w/w) when asphaltene rich blends where fed, while in case of resin rich blends, the amount of distillate produced increased when the resins contents increased. These results are consequence of a higher condensation level of the molecules present in the crude. For distillates, a discriminatory behaviour occurred depending on in which fraction was rich the blend fed to the process, with yields in the order of 20-40% w/w for the mixtures rich in resins and practically equal to zero in the case of mixtures rich in asphaltenes.