What is the diesel cold filter point related to?
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For example, it is related to the properties of the raw materials: a higher proportion of paraffin-based components results in a lower cold filter point. Is it also related to the processing methods? For instance, extracting more light components can make the process less viscous and reduce the specific gravity. How can the cold filter point be adjusted? Thank you
It is certainly related to operation; what we usually analyze and control is the freezing point.
How is it controlled there? Is the initial and final boiling points of diesel regulated?
The initial boiling point of the dry fraction is not controlled; instead, the amount extracted from the constant secondary stream is the key factor to control. However, this is also related to the amounts extracted from the upper and lower side streams as well as the reflux from the middle section, and adjustments are made according to the circumstances.
The cold filter point is primarily controlled by the boiling range, which is achieved by adjusting the amount of side-stream distillate and the distillation temperature