Issue of bottom temperature in the recovery tower for pressurized distillation of methanol in Tower 3
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In the pressurized distillation of methanol in Tower 3, an additional recovery tower is used; however, a high temperature at the bottom of this tower can result in wastewater that does not meet the required standards. According to experienced workers, a high temperature can also lead to problematic wastewater, as it increases the tower pressure, causing the recovery tower to become filled with liquid and impairing heat exchange at its bottom, thus resulting in wastewater that does not meet the standards. Is it correct? I think full liquid level and distillation are related, and it is not proportional to the tower pressure.
Only when the tower pressure is high will the temperature be high. The bottom of the tower is filled with liquid; (the wastewater from the tower bottom is of acceptable quality). This may not be due to a large feed volume, but could also be caused by high water content in the crude alcohol or by leaks in the heat exchanger. Also, at the peak tower pressure, heat exchange is somewhat reduced, as methanol has a high boiling point ； Additionally, the tower pressure is high, resulting in a larger relative pressure difference, and more wastewater needs to be discharged