Reprocessed contaminated gasoline
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When catalytic fractional distillation is used to reprocess contaminated gasoline, if the gasoline is heavy and yellow in color, it should not be used as a top cooling reflux; instead, efforts should be made to feed it into the fractionating tower through another inlet, such as the inlet for the rich absorption oil. Excuse me, why is this?
That’s because the gasoline boiling range exceeds 205 and even reaches levels typical of diesel; feeding it in from the top of the tower will affect the current adjustment of the gasoline boiling range. . . If the amount is not large, reprocessed catalytically contaminated gasoline can be used as part of the terminator. . . The requirements for the terminator are not very strict; it doesn’t matter much if its boiling range is slightly outside the specified range, as it will anyway go into catalytic cracking. When using this measure, it’s necessary to control the injection amount to keep it stable and not too high. . . :lol
Is the yellowish color due to the presence of diesel components mixed in?
Reflux is introduced from the bottom; the number of trays is low, resulting in poor separation efficiency. Additionally, it is not recommended to use oil-rich reflux for reprocessing, as this will affect the quality of diesel. It’s better to use a terminator.
It is because it is to avoid affecting the quality of gasoline