Regarding the issue of adjusting the oxygen content in Tower 1 for crude argon?
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Dear colleagues, regarding the high oxygen content (30-50%) in the output from Tower 1 for crude argon, if I want to reduce this oxygen content, I plan to do so by controlling the reflux ratio of Tower 1. My idea is to open up the liquid-to-air valve of the condenser in Tower 2, thereby increasing the circulation volume between Tower 1 and Tower 2. During this adjustment process, it is necessary to maintain a stable liquid level in Tower 2 for crude argon. In this way, the amount of liquid condensed in Tower 2 will be equal to the amount of liquid delivered to Tower 1 by the argon pump, and since the amount of liquid condensed is consistent with the circulation volume (the amount entering Tower 2 for refined argon remains unchanged), then wouldn’t the increased circulation volume equal the increased amount of liquid flowing downward in Tower 1 (by adjusting the argon pump to maintain the liquid level in Tower 2)? In this way, the reflux ratio of one tower is increased, which in turn allows the oxygen content in that tower to be reduced. Is there anything wrong with my logic? I would appreciate it if fellow sailors could point it out.
First, control the ratio of the argon fraction to the distillation air volume at 22~24%. Second, control the ratio of the argon distillate fraction to the process argon volume at 28~32 times. Of course, this is on the condition that the product contains an adequate amount of oxygen, and there is no nitrogen entrapment~~