JackWhite
Chemical
- Nov 29, 2011
- 13
Good day, gentlemen and ladies,
I'm dealing with gas mixtures, involving light hidrocarbons, water and sulphur oxides. As an experiment i created a stream with a composition of methane 0.4%mol, ethane 0.3, water 0.2, and SO3 0.1. P=1 bar, Flow=1 kmole.
The property package PR seems gives very close results compared with PR-sour, PR-TWU, SRK and so on.The envelope for this stream gives a dew point (no bubble point) that looks a bit weird.
Reading about this i took Mr. Joerds' suggestion and calculated in a case study, setting the vapour phase=1 and pressure 1 bar as independent vars, and temp as a dependent var. The results are puzzling, to say the least.
Temp keeps rising with pressure indefinetly, and the graph looks nothing like the envelope (values differ a lot).Same pb for a bubble point calculation ((20 bar,60 dC)on envelope; (20 bar, -100 dC)on table).
Wich do i believe?Thanks in advance, hope this issue isn't too silly to deal with.
I'm dealing with gas mixtures, involving light hidrocarbons, water and sulphur oxides. As an experiment i created a stream with a composition of methane 0.4%mol, ethane 0.3, water 0.2, and SO3 0.1. P=1 bar, Flow=1 kmole.
The property package PR seems gives very close results compared with PR-sour, PR-TWU, SRK and so on.The envelope for this stream gives a dew point (no bubble point) that looks a bit weird.
Reading about this i took Mr. Joerds' suggestion and calculated in a case study, setting the vapour phase=1 and pressure 1 bar as independent vars, and temp as a dependent var. The results are puzzling, to say the least.
Temp keeps rising with pressure indefinetly, and the graph looks nothing like the envelope (values differ a lot).Same pb for a bubble point calculation ((20 bar,60 dC)on envelope; (20 bar, -100 dC)on table).
Wich do i believe?Thanks in advance, hope this issue isn't too silly to deal with.