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Process Calculation

  1. Jan 8, 2006 #1

    siddharth

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    The question is
    In the production of a drug having a molecular weight 192, the exit stream from the reactor flows at the rate of 10.3 L/min. The drug concentration is 41.2% (in water) and the specific gravity of the solution is 1.025. Calculate (i) The concentration of the drug in Kg/L in the exit stream
    (ii) Flow rate in Kg-mol/min.

    The question I have is

    When the concentration of the drug is given as 41.2%, is it by mass or by volume? Is there any convention which is followed by engineers in this context? I ask this because in many similar problems, I have the same doubt.
     
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  3. Jan 8, 2006 #2

    GCT

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    it's probably by weight percent, I'm not sure how well a molecule with such a high molecular weight would dissolve when it consists of almost 50% of the total volume.
     
  4. Jan 9, 2006 #3

    Moonbear

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    When it is not specified to be by weight or volume (they really should specify this), you can usually assume they mean by weight when referring to a drug unless you have some reason to believe the pure form is a liquid at room temperature.
     
  5. Jan 9, 2006 #4

    Borek

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  6. Jan 10, 2006 #5

    siddharth

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    I asked my prof and he also said that unless it is specifed otherwise, I should take it as mass percentage.

    Thanks for the help all.
     
  7. Jan 10, 2006 #6

    GCT

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    what does this have to do with anything in reference to the original post?
     
  8. Feb 10, 2010 #7
    its solution is not too much difficult b/c you should solve in number of ways either my mass or by volume calculation
     
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