9 replies to this topic

[siddiqsh]

I need to calculate dewpoint of hydrocarbon mixture having ethane 5%, ethylene 30%, hexane 3% and rest nitrogen 62%(mole fraction). pressure 24 kg/cm²g, temperature 85°C. please give me steps for calculating dewpoint

[mrj]

Dew Point is 49.18 Deg C; i have used a simulator for this calculation.

[ankur2061]

Siddiqsh,

Check out this on-line calculator:

http://www2.questcon...rmo/dewbub.html

Seems to be fairly good.

Regards,
Ankur.

[clarenceyue]

Hi Siddiqsh,

You may like to try it by hand using the classic DePriester Charts. It may be approximate, but I really recommend that you try it by hand.

I have attached two diagrams for your reference.

Have fun!

 DePriester_Chart_High_T_SI.pdf   1015.72KB   152 downloads
 DePriester_Chart_low_T_SI_units.pdf   592.19KB   96 downloads

[siddiqsh]

thanks for your time.

I am looking for some method for calculating dewpoint using some equations.

[luuquocdai]

Please repeat this equations to get the result.
Best regards.
LuuQuocDai
luuquocdai@gmail.com

[siddiqsh]

Please repeat this equations to get the result.
Best regards.
LuuQuocDai
luuquocdai@gmail.com

how do i get Ki values using equation of state.

[clarenceyue]

dear siddiqsh,

please look up the chapter dealing with non-ideal VLE in any standard chemical engineering thermodynamics textbook, like Van Ness et. al. for example.

i think you'd learn alot more if you actually went to the library and do some looking up before coming here asking to be spoon-fed.

clarence

[breizh]

Hi ,
If I'm right you can found all the info in Process heat transfer from KERN and Perry's chemical handbook.
Regards
Breizh

[luuquocdai]

You can find the value of Ki in Gas Conditioning and Processing of John Campbell
If you have any question about this problem, please contact or reply as soon as possible.
Best regards.
LuuQuocDai
luuquocdai@gmail.com