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  1. quangkhoa90

    Copper Strip Corrosion failure!

    Dear experts, We are LPG producer and we are planning to import LPG from other producers to increase our LPG market share. However, LPG produced by other producers in the region contains H2S up to 10 ppm wt and Total Sulfur up to 40 ppm wt, that leads to the copper strip corrosion failure...
  2. quangkhoa90

    How to calculate the quantity of odorant needed to add to LPG!

    Thank you for your answers, There is actually no requirement regarding to the concentration of Ethyl Mercaptan (the odorant). We just inject an amount of 25 ppm as the supplier recommends. But through the info collected, threshold of detection of this ordorant is 1 ppb, so I calculated the...
  3. quangkhoa90

    How to calculate the quantity of odorant needed to add to LPG!

    Dear Experts, I am a junior process engineer. I would like to calculate the quantity of odorant needed to add to LPG (C3+C4) Could you help me out please? I did search on google, but I could find it nowhere Thank in advance for your answers Lee
  4. quangkhoa90

    Phase behavior of natural gas production !

    Hi, Here is the feed composition. Could you please generate the phase diagram ? What is the fluid characteristic at 109 barg, 26°C (feed condition) ? N2: 2.09998E-3 CO2: 5.9994E-04 C1: 0.7085 C2: 0.1341 C3: 0.075 iC4: 0.0165 nC4: 0.0237 iC5: 6.2994E03 nC5: 7.2993E-03 C6: 5.0995E-03 C7...
  5. quangkhoa90

    Phase behavior of natural gas production !

    Dear all, Thanks for your help, it is gas condensate and here is the composition of gas coming from offshore (%mol) : N2 (0.21), CO2 (0.06), C1 (70.85), C2 (13.41), C3 (7.5), iC4 (1.65), nC4 (2.37), iC5 ( 0.6), at 109b (gas pressure coming from offshore) , 26°C. I am using Hysys V7.3 and...
  6. quangkhoa90

    Phase behavior of natural gas production !

    In natural gas production, the wet gas coming to the processing plant is in the retrograde region ( in our plant, the natural gas is coming at 109 bar ). I would like to understand why 109 bar but not 130 bar or 100 bar. Here is my thought: The presence of liquid phase may impair the velocity...
  7. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Thank you for your help. I will create a new thread. Hope to have your support
  8. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    FYI, Our feed fractions are close to this one http://books.ifpenergiesnouvelles.fr/ebooks/thermodynamics/02/exo_02_04.html
  9. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    You mean the saturation vap press is a specific value at a specific temp, while there is different vap press at a specific temp, and thí vap press is smaller than sat vap press ? Did I get it right ?
  10. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Is there any particular benefit to operate the natural gas (in the pipeline from offshore to the processing plant) in the retrograde region ?
  11. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Thank you George and Emmanuel, I have discussed with a senior engineer, he told me that the system was operated in the retrograde region, however I could not confirm it by myself. In the case of an deethanizer, if water is present in the feed ( natural gas ), what is the effect on column...
  12. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Dear all, It looks like we were operating in the retrograde region. I have two other questions : 1/ In a distillation column (reboiler, condenser), suppose that the feed is constant, the hot oil supplied to reboiler is constant, if the reflux ratio is increased, what is the profiles of the...
  13. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    How could I check if it is operated in a retrograde region of phase envelope ? Here is the composition of gas coming from offshore (%mol) : N2 (0.21), CO2 (0.06), C1 (70.85), C2 (13.41), C3 (7.5), iC4 (1.65), nC4 (2.37), iC5 ( 0.6), at 109b (gas pressure coming from offshore) , 26°C I still do...
  14. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Thank you for your help. We have a plant to separate LPG from an associated petroleum gas (80% C2+C1, 15% C3+C4) at 109 bar and 26°C. The operating pressure of SC is 109 bar normally. It looks like when we increase the operating pressure, the liquid separated level is decreased, and I am...
  15. quangkhoa90

    What is the impact of operating pressure on slug catcher ?

    Hi all, I would like to ask you what happen to a slug catcher ( finger type ) when it is operated at higher (or lower) pressure ? Is the separated liquid lower than normal operation ? Thank you for your help
  16. quangkhoa90

    Simulating a dividing Wall Column (Petlyuk) On Aspen

    Thank you for your advice Sshep, I will try to give some good initial estimates. Regards Quang Khoa LE
  17. quangkhoa90

    Simulating a dividing Wall Column (Petlyuk) On Aspen

    Hello Sshep Thank you for your hint. I tried the Multifrac model, but it seems not easy to make the model converged. In fact, I have been trying to find the combination of heterogeneous azeotropic distillation and Petlyuk column. For the Radfrac col, we can specify the Azeotropic convergence...
  18. quangkhoa90

    Simulating a dividing Wall Column (Petlyuk) On Aspen

    Hi everyone, I am working on thermal couple column simulation. While simulating a Petlyuk column, I face up to a problem. The pre-fractionator has neither reboiler nor condenser, then the first time when the multicomponent feed is introduced to this column, the separation doesn't occur since...

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