Issues related to catalytic raw materials
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Does a high analysis density of a catalytic raw material mean that it is inferior to those with a lower specific density?
The density of the various fractions in oil increases as their boiling range increases, due to the increase in relative molecular mass; but more importantly, it is because heavier fractions generally contain a higher proportion of aromatic hydrocarbons. Literature shows that the densities of hydrocarbons of various types vary considerably. When the number of carbon atoms in a molecule is the same, aromatic hydrocarbons have the highest value, cycloalkanes come next, alkanes have the lowest value, and alkenes have a value slightly higher than that of alkanes. Therefore, raw materials with a higher density are more prone to carbon deposition than those with a lower density.
Generally speaking, the quality of oil can be indirectly assessed based on the density of the crude oil; oils with high density exhibit poor electrodesalting performance, flow properties, and atomization characteristics, resulting in low yields of products in catalytic reactors. However, judging solely based on density is not necessarily comprehensive; the density of residue at atmospheric pressure is similar to that of vacuum distillates, but there are significant differences in the carbon residue, metal content, and the composition of their four components in the crude oils, so a thorough analysis is required for accurate assessment.
It’s not necessarily the case; an analysis of the contents of the four components in the raw materials, as well as residues and alkaline nitrogen, can be carried out. Looking at density alone doesn’t tell you much