Catalyzed diesel density
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Since the operation of our plant’s catalytic cracking unit began, the density of the diesel produced there has always been around 930. I wonder if the density of catalytic diesel produced in other plants is also this high Why is the density of catalyzed diesel so much higher than that of diesel at atmospheric pressure?
In catalytic reactions, there are cyclization and dehydrogenation reactions, especially in the catalytic processing of heavy oil; as a result, diesel products contain a high level of aromatics. Aromatics have high densities, and the density of catalytic diesel produced by certain plants is not very high – in some cases, it can reach 0.95.
So, how is catalytic diesel generally treated? Can aromatic extraction be used?
The aromatics in catalytic diesel are mostly those with two or more rings, and they contain heteroatoms such as sulfur and nitrogen. The aromatics obtained after extraction have limited utility; generally, hydrogenation is used to reduce their content and density. To achieve a significant reduction, special hydrogenation processes such as RICH, MCI, and MHUG are required.
Generally speaking, straight-run oil contains a high level of straight-chain alkanes, especially the paraffin-based Daqing oil. Straight-chain alkanes have the lowest density among hydrocarbons with the same number of carbon atoms; by employing processing techniques that alter the structure of these hydrocarbons and reduce the content of straight-chain alkanes, it is possible to increase the density.
What’s there to worry about if the density is high? It can be increased through hydrogenation
The density of catalyzed diesel is higher than that of straight-run diesel because catalyzed diesel contains more heavy components, which affects its density.
When I went to the lab*, the density of catalyzed diesel was 0.9
Catalyzed diesel is obtained by subjecting crude oil to a catalytic reaction, during which the carbon chains are recombined in various ways; as a result, it differs from simple physical separation processes using vacuum and pressure. The density of catalyzed diesel varies depending on the properties of the crude oil. A colleague once told me that the catalyzed diesel he worked with once reached a density of 96.
The density and cetane number of the catalyst are related to various factors, such as the properties of the catalyst feedstock, the catalysis process, and the control parameters, among others. After adopting the MIP-CGP process, the value increased from 0.9 to 0.93, with a maximum of 0.95; the lowest cetane number was 18, while it is currently around 27, with no significant changes in raw materials or other parameters.
The density of Daqing catalyst fuel is less than 0.9, mainly due to paraffinic crude oil.
In catalytic reactions, there are cyclization and dehydrogenation reactions, especially in the catalytic processing of heavy oil; as a result, diesel products contain a high level of aromatics, and aromatics all have high densities. 2. It is related to the production of fuel oil; the higher the density of the fuel oil, the higher the density of the catalytic diesel. The density of catalytic diesel in your facility is not very high – in some facilities, it can reach 0.95.
Based on the conditions of our units, the density of the catalyzed fuel generally fluctuates around 0.93. This is related to the properties of the crude oil as well as the processing methods used; generally, when the crude oil contains less saturated hydrocarbons and more aromatics, the density of the catalyzed fuel is relatively higher. Also, when diesel itself has a higher consistency, its density is greater as well. We have produced diesel with a density of 0.89, as well as diesel with a density of around 0.94 – both of these are normal.
The density of diesel produced by heavy oil catalysis is higher than that produced by wax oil catalysis.
In heavy oil catalysis, the diesel products contain a high level of aromatics, and since aromatics have a high density, here it is also around 93-94