How is the freezing point of diesel refined from modified diesel controlled and adjusted?
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Does the freezing point of refined diesel mainly depend on the properties of the crude oil, with little influence from the diesel upgrading reactions and the adjustments made by the distillation system?
A hydrogenation dew point depression catalyst can be used. For example, by converting long straight-chain alkanes into isoparaffins with single side chains, the freezing point can be reduced significantly ； In the case of a refining unit, adding side draws to the distillation tower can be used to produce a small amount of diesel with a low freezing point; of course, it is better to change the composition of the feedstock – adding naphtha to the feedstock yields very good results.
Adjust the raw materials, or add more demulsification reactors and use demulsification catalysts. Additionally, a pour point depressant can be added to refined diesel
Which catalyst is used in this device? From what the original poster said, it seems to focus on the way of operation? I wonder what raw material is being processed? Personally, I feel that raising the reaction temperature increases the reaction depth. In the design of such devices, the raw materials to be pre-processed are taken into consideration from the outset, and a catalyst suitable for the properties of the crude oil is selected accordingly. The freezing point is greatly influenced by factors such as the catalyst and the properties of the crude oil, and the amount that can be changed through operational adjustments is limited.
Can increasing the reaction temperature correspondingly lower the freezing point?
It mainly relies on the reaction section; if there is more than one side stream in the distillation section, there is room for appropriate adjustments
Okay, thank you all for your answers. . .