3 replies to this topic

[mido]

i want to ask this question it already annoying me why co2 when expanding through membrane in aprocess like sweetening of natural gas by membrane not cooled according joule_thomson effect actually it cooled but not to much it drop from 50c to 40c when expand from 60 bar to 1.5 bar!!!!!!

can i get answer

[Andree]

Are the adiabatic contitions (or close to adiabatic) maintained in this process?
Joule-Thompson effect refers to rapid expansion and it is defined for adiabatic process... This can be an issue, but it is only my guess...

[rxnarang]

A quick run on HYSYS telles me the temperature drops from 50°C to -20°C for an isoenthalpic pressure drop of 60 bar.

Regards
Rajiv

[Zauberberg]

I am not 100% sure about this one, but I will give a try...

If I remember well, for each compound there is a curve called "inversion curve" which defines the effect of temperature change in case the pressure is increased or decreased. It means that above certain temperature, Joule-Thomson coefficient has a positive value and expansion does not lead to a temperature drop.

It was a long time when I was studying this effect... I think you can find many references @ Perry's or GPSA books, amongst others.