How to reduce ethanol in a distillation atmospheric pressure column
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Ethanol is considered a higher-boiling component compared to methanol; therefore, to reduce its content during operation, it is necessary to increase the reflux ratio and raise the amount taken off via side streams. Additionally, an analysis of the ethanol content in crude methanol was conducted to see if there are any significant changes. I hope this can help you.
1. Side extraction is the most crucial factor. 2. Increase the pressure in the atmospheric tower. 3. Slightly raise the reflux ratio. 4. Temperature control should be appropriate – it shouldn’t be too high. 5. Other auxiliary measures such as increasing venting and reducing the liquid level in the atmospheric tower can also be tried
The process is determined primarily by the components involved; if methanol and ethanol need to be separated, as well as ethanol and water, then heat pump distillation should be used. If all three components – methanol, ethanol, and water – are present, then a baffle should be employed to reduce interference from the intermediate fractions.
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We keep the ethanol content below 200 ppm, primarily based on agreements with the buyers. The main methods we use for control are as follows: 1. Controlling the temperature of the sensitive plate, which is quite crucial. The temperature can be reduced by another one or two degrees on top of the current level. 2. Control the amount of fusel oils extracted, to ensure that the Reorganization components are removed; the alcohol content in the fusel oils can be used as an indicator of the temperature control effectiveness of the sensor plate. 3. Control the feed rate and reflux rate in the atmospheric pressure tower – increase the reflux rate appropriately to prevent large fluctuations in the feed rate
Increase the reflux ratio and the side draw; monitor any changes in the ethanol content in crude methanol; adjust the loads of the pressurized column and the atmospheric column