What is the reason for the inverse temperature gradient near the feed in the extraction distillation column?
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The temperature in the extraction distillation column originally decreased gradually from the bottom to the top of the column, but an increase in temperature was observed in the upper trays near the feed. This is what it looks like during normal operation! This phenomenon also occurs in the deheptanizer of the isomerization unit. How can this be explained?
Are there any DCS screenshots? If that happens, it means the tray has dried out.