High density
Thread Content
How to adjust the high density of hydrogenated refined diesel and gasoline
Hydrorefining is primarily a refining process aimed at removing sulfur, nitrogen, and oxygen, as well as saturating olefins; it has very little effect on density, and its outcomes mainly depend on the upstream raw materials.
The specific gravity of hydrogenated naphtha mainly depends on the composition of the raw materials. The ratio of raw materials can be adjusted. If one were to further fractionate and systematically adjust the specific gravity of naphtha, the initial boiling point of diesel would likely be very low.
Pure hydrorefining mainly relies on the control of upstream raw materials; by adjusting the ratio of crude oils, and in the case of cracking, the specific gravity can be controlled through cracking reactions. Of course, the most important factor is still the crude oil itself. . .
That’s right, upstream catalysis, coking, atmospheric pressure control
It is necessary to determine what the key components in diesel are that affect density; if it is the saturated aromatic compounds that have an impact, then the hydrogen partial pressure can be increased while reducing the space velocity, with the temperature kept below 405 degrees℃
Hydrorefining units have limited means for controlling density; reliance is still placed on adjustments made in the upstream units. If there are cracking catalysts inside the reactor, it is possible to try increasing the temperature to enhance the cracking reaction, but the effects of this approach are also very limited. The main responsibility lies with the upstream units
Hydroprocessed diesel has a high density; in fact, it’s necessary to check whether there is a leak in the heat exchanger or if the raw materials have mixed together. The hydrogenation process itself does not have a significant impact on density! It mainly depends on the fractionation in the atmospheric and vacuum distillation units; moreover, too high a density is also detrimental to the catalysts!
The catalyst in the refining unit has limited cracking efficiency; the reaction pressure is low, which results in limited effects on reducing the density of diesel. Within the scope of this unit, adjustments are mainly limited to methods such as lowering the flash point of diesel and increasing the partial pressure of hydrogen in the reaction
Gong Chen, the high proportion of products is mainly due to issues with upstream supply.