I would like to ask about the issues with the argon stop tower
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When shutting down the argon column, first slowly close the valve that supplies process argon to the middle of the pure argon column and open the discharge valve; then close the valve that sends liquid nitrogen to the condenser, as well as the valve that sends nitrogen from the lower part of the column to the condenser. Should I first close the valve that leads from the lower column of the pure argon tower to the upper column, then turn off the process argon and switch to discharge mode, and after that close the valve that leads to the pure argon condenser for liquid nitrogen? Either one will do; is there any particular order in which they should be operated? ?
Economic and quality issues: ensuring no waste of cooling capacity, maintaining purity, and ensuring stability
What are the specific steps? Which one is the best among those listed above?
It is recommended to slowly close the valve for liquid nitrogen flow into the condenser, while opening the valve for discharging process argon~~ Maintain a normal pumping rate to prevent nitrogen blockage~~ Also pay attention to the pressure in the pure argon column; it may be appropriate to close the valve for nitrogen flow into the pure argon evaporator and open the valve for discharging non-condensable gases from the pure argon column~~