Factors affecting octane number loss in gasoline hydroprocessing
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Dear teachers, what are the influencing factors on the octane number loss during gasoline hydroprocessing, in terms of both the feedstock and operational adjustments? Our octane rating decreases by 1–2.1 points; what can be done to keep this loss as low as possible? ? ? Thank you! ! !
Generally, the higher the content of olefin in the feedstock, the greater the RON loss after hydrogenation.
Ensure that the loss of olefins during hydrogenation is not excessive; if sulfur content can be kept under control, try to minimize the degree of reaction. Additionally, properly control the cut rate in the fractionator before hydrogenation
The process of gasoline hydrogenation is generally selective hydrodesulfurization; it is necessary to control the cut point of the pre-distillation tower (the tower used for separating light and heavy gasoline). While ensuring the desired desulfurization level of the product, the degree of reaction should not be too high. :)
Desulfurization and hydrogenation can cause the saturation of olefins, which are the main components that contribute to octane rating; therefore, it is advisable to carry out hydrogenation in two stages, with the degree of hydrogenation not being too high
There are many influencing factors; for example, the olefins in the feedstock, the total sulfur content and the form in which sulfur is present in the feedstock, as well as the contents of hydrogen sulfide, CO, and CO2 in the recycled hydrogen – all of these contribute to the loss of octane number.