Discussion on the control parameters for the alcohol-water tower in low-temperature methanol washing
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Here, at the top of the tower, the temperature is 95.3 degrees, the pressure is 0.206 MPA, and the reflux volume is 20 cubic meters. Due to the poor efficiency of the heat exchanger, the reflux temperature reaches around 89 degrees. When the operating conditions of the tower remain stable, the water content at the top of the tower can drop below 0.5. I would like to ask everyone about their current operating conditions
I wonder if the original poster and the others have taken samples to test the water content in their methanol, and what are the values?
Agree with the view above; the water content in the recycled methanol is one of the factors affecting the water content at the top of the tower
The reflux used in our tower is the reflux obtained after cooling the vapor at the top of the tower; it is not the methanol reflux from the heat-regeneration tower
This post was last edited by ningzi521 on 2016-5-11 at 14:45. The principle is the same; have you ever measured the water content in methanol that has been recycled?
It’s the water content at the top of the tower I’m talking about; it’s 0.5 when it’s good, and 1.3 when it’s poor
Start with the reflux ratio. It is recommended to check whether there are any changes in the methanol content in the feed water, as well as any changes in the feed volume.
A high water content in the methanol vapor at the top of the methanol-water separation tower indicates that the heavier components (water) have been vaporized; this means that the temperatures at the bottom and top of the tower are too high. During operation, the temperatures of the sensitive plate and the top of the tower were not properly controlled, resulting in these elevated temperatures.
The top temperature is around 98.2°C, and the pressure is around 2.3 bar. The water content is around 0.7%.
Your tower is pretty good then – I keep the temperature very low, yet the water content remains high. Does your tower have a pressure difference?
Well, the feed is the liquid coming from the bottom of the azeotropic tower; it seems to play a significant role