3 replies to this topic

[valentino]

when defining the parameters for the shortcut distillation to get the reflux value for the distillation column in hysys. u need to define the light key and heavy key components. for a feed stream for the recovery of TEG in natural gas processsing , whats the LK and HK if i have the following components, thanks
Methane
Ethane
Propane
i-butane
n-butane
i-pentane
n-pentane
n-hexane
n-heptane
nitrogen
CO2
O2
H2S
H2O
TEG

[Zauberberg]

That depends on what are the desired products - both overheads and bottoms. For example, if you are recovering C5+ in the bottom stream, then the LK is n-Butane and the HK is i-Pentane.

For your list, any component can be LK and HK - it all depends what do you want to separate.

[valentino]

i want to recover nearly pure TEG as the bottoms. so for such will my HK be TEG and LK is H20?

Edited by valentino, 18 October 2010 - 01:15 PM.

[Zauberberg]

If you are speaking about the TEG regenerator, then slightly different rules apply since you are constrained by the TEG degradation temperature (400 degF). That is why we frequently employ stripping gas for achieving higher TEG purities because water boil-off is not sufficient for obtaining high-purity glycol.

You can read more at: http://oilgasprocess...com/tegdehy.htm