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  1. DonyWane

    Unexpected Packed Bed Scrubber Performance

    sshep... As for the liquid rate...we were actually testing another part of our system and only noticed these anomolous results later (because we were monitoring the entire system). We will vary liquid flow in upcoming testing. Now to your questions... 1) The bottoms from the scrubber...
  2. DonyWane

    Unexpected Packed Bed Scrubber Performance

    We recently began startup testing of a new scrubber configuration at our plant. Details: Column: 6" Pipe Packing: RMSR 40 (essentially 1.5" IMTP) Pfactor = 24 ft-1 Packing Height: ~4 ft. Test gas: Nitrogen quenched to approximately 100F (gas temp could be higher) Test...
  3. DonyWane

    Calculation of NTU for Scrubber

    StoneCold, Thanks for your suggestion. Our process involves very high temperatures - and although we use a series of eductors/quenches to cool the stream - we have a requirement to protect the packing at elevated temperatures that are beyond the acceptable range for plastic packings. I have...
  4. DonyWane

    Calculation of NTU for Scrubber

    I am performing some design calculations for a HCl / KOH scrubber. I have calculated the height of a transfer unit assuming that the mass transfer characteristics behave like a HCl / H2O scrubber (but with H+ concentration always at zero because of the excess KOH I know that I have). Next (and...
  5. DonyWane

    Choose a process simulation model.

    By dynamic modeling, I meant batch distillation, drying, etc. - unit operations in which an important process variable is to change over time. Of course, you can also perform dynamic systems control as well. Also - I meant to say electrolyte modeling - not electrodynamic modeling!! Oh...
  6. DonyWane

    Choose a process simulation model.

    I have only used ChemCAD (by Chemstations), which is another process simulation package. It is in its most basic form a steady state modeling tool. However, it can be "tricked" to perform some dynamic modeling. If you want to spend the money, the dynamic modeling add-on can be purchased. The...
  7. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    Fizzhead, NFPA 33 outlines a simple method for determining what percentage of the MEC is being reached in a spray booth based on MEC, maximum powder release rate, and air flow rate. It is pretty much the most straightforward calculation that can be imagined. In the calculations you described...
  8. DonyWane

    Halar Electrostatic Coating

    I have been asked to evaluate a Halar electrostatic spraying operation to determine what exhaust rate is required to maintain the plastics concentration to a value less than 1/2 the MEC (minimum explosible concentration for dust explosions). Does anyone know what the MEC of Halar powder is...
  9. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    Fizzhead/25362, Thank you for your posts! The explosion risk I was interested in evaluating was a dust explosion. In regard to dust explosion, any suggestions on how to find a MEC? Also, to clarify a statemetn you made Fizz, is the spray "plume" something that the electrostatic precipitator...
  10. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    I posted the following message on the plastics forum - but it doesn't seem to get much mileage these days. Perhaps one of you could help.... A general web search didn't turn up any results and I do not have any plastics literature - so I wanted to run this up the flag pole with you guys/gals...
  11. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    A general web search didn't turn up any results and I do not have any plastics literature - so I wanted to run this up the flag pole with you guys/gals. Does Halar/ECTFE have an MEC and if so, what is it? Also, what are acceptable methods for determining source terms that would feed into...
  12. DonyWane

    Salt on Ice - how does it melt?

    I haven't ran through the calculations - but I don't think I have to. Because of the size of a human's feet, I think that the induced pressure would have very little effect on the freezing point of the solution. With roads, cars do weigh a bit more and the tread is a bit smaller than feet, but...
  13. DonyWane

    Lithium/Water Reaction

    I tend to agree with your logic about pseudo-first-order. In my case, I am placing a small amount of Li in a large amount of water. I anticipated that I could approximate the rate as first order with respect to Li. I would guess that the rate equation would be based on something like the...
  14. DonyWane

    Lithium/Water Reaction

    In reference to my previous post - I believe that I have figured it out. The rate equation given is the temperature dependent form of the rate constant. From this and the the fact that it is second order, the calculations should be able to be carried out. Unfortunately, the equation appears...
  15. DonyWane

    Lithium/Water Reaction

    Thanks! This seems very close to what I need. The next step is interpreting the rate equation! I notice that the reaction mechanism is not balanced for H2 - instead it is balanced for H. I don't know what impact that has on calculating H2 generation. Do you read the units (cm^3/molecule-s)...
  16. DonyWane

    Lithium/Water Reaction

    I have found several references to the rate of reactions for metal/water reactions, but they have all been qualitative. Does anyone know what the rate of reaction for a lithium/water reaction is (quantitatively)? I know that it is slower than sodium and much slower than cesium, but that is...
  17. DonyWane

    Air Fed Double Diapragm Pumps

    I was under the impression that the maximum discharge pressure in an AODD pump was the air pressure. Your comment about differnt sized diaphragms does make some snese - I had never thought of that arrangement before. But - wouldn't the second stroke be decreased in pressure by half? Also, for...
  18. DonyWane

    Double Diaphragm Pumps

    Thanks for your help on this Ken. Sounds like running two in series may be more trouble than it is worth. I have ran a lot of calcs invoving an AODD pump motivating fluid from a reservoir to another reservoir (essentially - open systems). Have you ever ran the calc on a closed loop system...
  19. DonyWane

    Double Diaphragm Pumps

    I was actually asked to perform some calculations concerning system performance (i.e., flow rates at various filter DP and other system drops). The conceptual design was performed by another engineer. The pumps will "live" on a cart that will be attached to tanks with cleaning pigs...
  20. DonyWane

    Double Diaphragm Pumps

    Ken, Thanks for the response! The particular setup I had in mind was a AOD pump followed by a run of piping/filters then a second AOD pump followed by a run of piping/filters and then back into the first AOD pump. This could possibly address the 10 psig inlet issue. So, even in this...

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