Problems with hydrogen sulfide concentration towers
Thread Content
The bottom temperatures of the hydrogen sulfide concentration tower and the carbon dioxide separation tower are high, while the temperatures in the middle and top sections of these towers are appropriate. Could someone with expertise please explain this to me? Thank you
Taking the upper tower of the hydrogen sulfide concentration tower as an example, since it has air intake at the bottom and contains a large amount of hydrogen sulfide, which is absorbed by methanol； The rich methanol enters at the top; as it enters the tower, a portion of the CO2 is desorbed due to the drop in pressure. Since absorption is exothermic while desorption is endothermic, this results in fluctuations in temperature. The high inlet temperature at the bottom of the two towers is also one of the reasons for this phenomenon.
The reason is that the mass transfer process of absorption under analytical pressure occurs again as they descend the column.