What is the effect of lowering the position of the reflux line on the distillation column?
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What is the effect of lowering the position of the reflux line on the distillation column? As shown in the figure, what effect does lowering the position at which the distillate is returned to the tower have on the distillation tower? He hasn’t changed at all – the operating parameters, the composition of the feed, and so on. The only thing that has changed is the reflux position. We need the purity of the components at the bottom of the tower, as well as the compositions at the top and bottom of the tower, the pressure difference, the separation efficiency, and more… Please advise, expert
Hello, does this tower have a total of 23 trays? What distributor is being used?
Making such a change should be fine; the impact will be minimal. First of all, the return pipeline is still located above the distributor at the very top. The only potential issue is that it may affect the distribution of the liquid level in the distributor, leading to flooding phenomena. Other factors need to be taken into consideration, but there shouldn’t be any problems
This post was last edited by ylb913 on 2018-10-2 at 13:54. Logically, in the case of a plate tower, the reflux liquid must enter from one end of the liquid distribution tray; the height of the reflux pipe corresponds to the different heights of the vertical guide tubes. In the case of a packed tower, the reflux pipe usually has a trough-type distributor. This trough-type distributor has its own height, and this height cannot be reduced. If a \"F\"-shaped distributor or nozzles are used, reducing the height of the reflux pipe will affect the uniformity of the reflux flow; in other words, it reduces the effective height of the packing inside the tower. As a result, the concentration of the distillate at the top of the tower will be lower, or the amount of reflux flow will need to increase. A reduced effect of reflux absorption at the top of the tower increases the purity of the heavy components in the liquid at the bottom of the tower.
If there are distributor packing on the 23 plates, it affects purity. If not, the impact is minimal
Guanguan, it’s likely that your backflow volume is too high; in order to prevent liquid droplets from being carried into the condenser, the backflow position has been lowered to create more separation space.
Does the light component content in the tower bottom increase or decrease? Can it be analyzed?
Guangguan, no one can give an exact answer based on what you’ve provided; it mainly depends on using simulation software to calculate the degree of distribution and the impact on the sensitivity of the tray. There are differences; simulations are still needed to determine the extent of those differences
Specifically, it depends on what tower it is – whether there are trays in the drop height, etc.
I can’t see my reply on the computer