Let’s discuss the C2 issue again.
Thread Content
The bottom temperature of the desorption tower was raised to 100 degrees, and the amount of absorbent added was reduced to the minimum level; yet the C2 level still exceeded the specified limits, ranging from nearly 3 at lower levels to 6 at higher levels. It’s not clear whether this is due to operational issues, equipment problems, or issues with the raw materials
The question is unclear; which location (medium) has C2 exceeding the limit.
It’s liquefied gas, right? Check whether the temperature reading is accurate; since the system pressure isn’t changing much, it’s okay to continue raising the temperature of the distillation tower ； No matter what the raw materials are, the product quality must be satisfactory.
Check and slightly reduce the top pressure of the absorption tower as well as the temperature of the lean absorption oil. Continue to increase the temperature at the bottom of the desorption tower and observe the effects.
Is it a catalytic device? A bottom temperature of 100°C isn’t high at all; there’s at least a 20°C margin.
Learn more from the original poster*; when encountering problems, try to find out more about them@@
This post was last edited by Lame Rabbit on 2012-12-3 at 19:25. It might be a problem with the operation of the absorption tower; an excessive absorption effect increases the load on the stripping tower. It is recommended to reduce the pressure in the absorption tower and try to decrease the cooling effect in the middle section of the tower
Absorption and analysis are in a balanced relationship; have you absorbed too much? Or you have too much light hydrocarbon (such as non-condensable gas and light hydrocarbons from the gas stream), which results in an excessive separation load. Is there a problem with the analysis tower as well? For example, the issue of insufficient temperature mentioned earlier, or problematic processes such as hot feeding and reboiling in the middle section?
The temperature at the bottom of the desorption tower can be increased further; appropriately reducing the pressure at the top of the desorption tower is also a good option. Does the desorption tower have mid-stream reflux? Is there internal leakage with water? Also, check if there is excessive absorption? Is the condensate oil pump operating properly?