1 reply to this topic

[ofelia007]

Hi,

I'm a student and I'm currently working on designing an absorber tower to remove H2S from this stream (% are weight/weight)
h2s 1,35%
ch4 0,73%
c4h10 0,98%
c6h12(ciclohexane)22%
c7h14 (metylciclohecane)22%
H2 52,94%

I have considered an amine solution (MDEA 40% water 60%)to remove H2S. For my simulation I'm using Radfrac block. I'have defined this components h2s ch4 c4h10 c6h12 c7h14 and water. With Elec wizard Aspen introduces ELEC-NRTL properthy method and it creates this reactions in Chemistry section:
water<-->H+ + OH-
H2S <--> H+ + HS-
HS- <--> H+ + S--
MDEA+ --> MDEA +H+

The problem I have encountered is that when I define Henry's components I select all available components except water and mdea (my solvent), but the software notify me that it has not in its datas the parameters for c6h6 and c7h14 henry's law. How can I do????

any help would be appreciated.

Thank you

Anna

[pandia]

Hi,

Hentry's law applicable only for gases. If the solublity of the compnens are not there in software it doesn't take in account. I am also trying to do the same simuation in Apsen 11.1 but it doesnot converging a better result.

Set the hentry's law componenet in default, possible it will take only H2S from your stream....

Are you using ASpen 11.1 or 12.1 like that or some special software? You shall contact me at pandia1984@gmail.com

Thanks

Hi,

I'm a student and I'm currently working on designing an absorber tower to remove H2S from this stream (% are weight/weight)
h2s 1,35%
ch4 0,73%
c4h10 0,98%
c6h12(ciclohexane)22%
c7h14 (metylciclohecane)22%
H2 52,94%

I have considered an amine solution (MDEA 40% water 60%)to remove H2S. For my simulation I'm using Radfrac block. I'have defined this components h2s ch4 c4h10 c6h12 c7h14 and water. With Elec wizard Aspen introduces ELEC-NRTL properthy method and it creates this reactions in Chemistry section:
water<-->H+ + OH-
H2S <--> H+ + HS-
HS- <--> H+ + S--
MDEA+ --> MDEA +H+

The problem I have encountered is that when I define Henry's components I select all available components except water and mdea (my solvent), but the software notify me that it has not in its datas the parameters for c6h6 and c7h14 henry's law. How can I do????

any help would be appreciated.

Thank you

Anna