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  1. 22082002

    chemical formula of wood

    It contains cellulose, lignin, etc....
  2. 22082002

    Foaming in recycle gas amine absorber

    Keep Amine temperature atleast 5-6°C above the recycle gas temperature. If hydrocarbons condense into amine, then it's a problem. Never allow in HC-level build up in RGKOD, check physically the level is not there in the drum. What's amine concentration, try 1-1.5% lower concentration and see if...
  3. 22082002

    reboiler in the column

    By saying beating around the bush, I no way wish to disrespect etseemed gentlemen gave valid judgements. Please excuse me if I offended. It's just that the fundamental information/analasys may be missing on poster's side.
  4. 22082002

    reboiler in the column

    Request vishwa to refer the distillation design and Operation by henri kister. In the end of these books he has given several operation problems solved and design book gives guidelines.Other book -reliable operation for petrchemical and refinery(check the title). he has this problem explained...
  5. 22082002

    Recycle K. O. Drum

    Following considerations: 1) you have very small amount of liquid coming along with the gas.This you can verify from the vessel spec, if you are rightly investigating. 2)the diameter of the vessel is essentially function of the vapor-liquid separation,(stokes' law). 3) the vessel may be made of...
  6. 22082002

    Revamping a Distillation column

    Wow! what a simple question ! I will try to answer the question's first part, in repsect to capacity enhancement. you need to get vapor+liquid flows on each trays, downcomer backup, flooding margin, velocity under donwcomer, increased pressure drop and adequate margins for foaming...
  7. 22082002

    High Dispersion Trays for Hydrotreating

    You can also try Haldor Topsoe VLT trays. Again these tray would be expensive, but you are assured of very good V+L distribution on the entire bed,(+/-3°C or even better). I experienced +/-1°C when Guarantee Test Run was done. Only one in 37 RTD's deviated by 5°C otherwise it was +/-1°C. Topsoe...
  8. 22082002

    Naphtha hydrtreatment

    Try UOP,Axens,HaldorTopsoe, criterion websites, they have the catalysts for this service.
  9. 22082002

    PSV relief

    Just a bit more information.... After finding out the release flows and fluid properties, at both upstream and downstream pressure levels, which a process engineer sends to PSV/Relief valve calculating engineer(i.e.the instru. engineer), that gentleman, I believe, adds additional 10% margin to...
  10. 22082002

    Control Valve confusion, Ball or Globe?

    I will add to more confusion. In our polymer plant, which had 8-9% polymer of C2, C3 and some more compounds, where we needed stricter pressure control. So we used ball valves with 2 triangular notches in the ball and two in parallel of 4" size.
  11. 22082002

    Gas cleaning

    Cool the gas to remove the water. You can use CMS-adsorbents, if water is very small.. Contact PALL for filters for use fine mesh (Bag) filters, trial and error will also do...
  12. 22082002

    Water and Hydrocarbon Dew Point temperature

    Handbook of chemical engg. calculations by Nicholas P Chopey..!
  13. 22082002

    hydrogenator in hydrogen unit

    Practise: 1- Increase the inlet temperature as long as temperature is less than 400°C, at outlet. 2- replace catalyst(if you cannot regenerate it).You need to have some minimum sulfur to keep the catalyst active for HDS, check with catalyst manufacturer for how much S is needed, usually 2 ppm or...
  14. 22082002

    Hydraulic design of tray distillation columns

    Few days back, I searched for this.,Try: 1) google search for distillation tray design. 2) Henri Kister's Distillation books( design & operation) and if you can talk to Koch-Glitsch, they had a free software (now I could not see it) 3) Perry's universal reference handbook.. Hope this helps you..
  15. 22082002

    Atmospheric Tower Corresion

    It may not be reasonable to you( but may I know why do you feel so..?), that's how the columns are designed.
  16. 22082002

    We are about to carry out tightness

    Nirav, After reaching 42 kg/cm2g pressure, you can inject Nitrogen from HP Nitrogen cylinders.... and I am sure you won't need many cylinders... Before pressurising with Nitrogen, ensure that vacuum is held for atleast one hour(I am sure you're talking next step of this but...), there should...
  17. 22082002

    Heat developed in circulating fluid

    E. Ludwig's book has answer for your question.. This will solve the problem.
  18. 22082002

    Pressure Increase in Thermal Relief

    Refer to API 521, sec 3.14, Hydrualic expansion.
  19. 22082002

    Air Fan Coolers

    In fire case: You can consider fire upto the height og 25 ft only. So in case of fire, you will not have any cooling... and if you can let me know which case you are considering. You cannot have two unrelated cases. So fire is one case and loss of cooling is another case. Further to this, you...
  20. 22082002

    Air Fan Coolers

    Air cooler can also subcool... In case of power failure, air cooler can do it's job by 20-30 % duty. Now this has to be done in a new calculation, better if you have simulation package, do a new simulation with duty 25% and get outlet condition for the power fail case. Hope your query is...

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