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Homework Help: Oil and Water Separation

  1. Nov 17, 2013 #1
    1. The problem statement, all variables and given/known data
    A fluid which is flowing at 3600 m3/hr, at a pressure of 2.3MPa and a temperature of 75°C is to be separated using a vertical separator vessel. The composition of the fluid is 50% water and 50% oil.

    1. Assume perfect separation and a residence time of 20 seconds in the separator.
    2. The oil has a MW of 100 and a density of 900kg/m3
    3. Give estimates for line sizes and vessel dimensions
    Your answer is to be a simple PFD (with stream table):
    kmoles oil
    kmoles water
    Total moles
    Mass flow water
    Mass flow oil
    Total mass flow
    Mean molecular weight

    2. Relevant equations
    Conversions between mass, molar and volumetric flow rates.

    3. The attempt at a solution
    In the above problem, is it correct to assume that the temperature of the inlet stream will be the same as the two outlet streams seeing as there won't be any thermodynamic processes carried out on the mixture? Also, from the way I see it, it's only possible to calculate the molar flow rate of oil and water, it's not possible to calculate how many moles of oil and how many moles of water there are in total. Is this correct or is it actually possible to find these values?
  2. jcsd
  3. Nov 18, 2013 #2
    It's possible to calculate the number of moles of each within the separator. I think that is what they are asking for.
  4. Nov 18, 2013 #3
    That'll just be the molar flow rate times the residence time, yes?
  5. Nov 18, 2013 #4
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