The concentration in the isobutane removal tower cannot be increased
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The tower is designed for a feed volume of 87 tons, but we are operating at 95 tons; all parameters remain stable. The reflux rate has been increased, yet the purity at the top of the tower is still poor. What could be the reason?
Are there any deviations from the process parameters? Is the instrument accurate? Analysis of feed components. Top of tower composition analysis determines whether the light components or heavy components are in excess.
The composition of this make-up stream plays a significant role; followed by the bottom temperature of the tower and the reflux ratio. Additionally, it is necessary to determine whether the gas-liquid load on the tower itself has exceeded the maximum value specified in the design
First, determine whether the instruments are accurate, what differences exist between the various parameters and the design specifications, whether the load is within the designed range, and whether the coolers and reboilers are functioning properly. Let’s check these now
Was there any abnormality in the operation of the previous tower?
Confirm the instrument parameters and analyze the test data. Check the top condenser as well as whether the tower is overloaded. I’m not sure if your tower uses packing or trays; it’s possible that there is a problem with the internal components of the tower. It’s necessary to check each element such as the packing, feed distributor, and trays one by one to identify the issue. Since I don’t know the specific operating conditions in your case, this is just for reference
Is the temperature at the bottom of the tower too high? Has the temperature of the sensitive plate exceeded the limits specified in the process sheet? Has there been any change in the raw materials? Look for reasons from various aspects!
Can’t we increase the purity in our alkylation deisobutane column either? Is it because the feed load to the column is too high?
Slightly reduce the bottom temperature of the tower and increase the tower pressure slightly
It is also possible that the operation of the previous 3 decarboxylation towers was not optimal