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  1. RogerH

    sulfites in amines - why, where do they come from, consequences...

    Planteng You dont mention the service. If it is MDEA for a SRU tail gas treater I can see a reason for some SO2 slippage serve as a source for sulfite in the amine The other possible source I can come to think about is if the MDEA storage isnt gas-blanketted i.e. contains oxygen that can serve...
  2. RogerH

    Diesel Vacuum Drying

    Weijieyap Some operating parameters, like 130-145°C, 0.10-0.15 bara in a 5-6 tray drier will give about 40-50 wtppm water in diesel. The good thing with a vac drier you can estimate the water content directly from the operating parameters. Usually a steam stripped fractionator with a drier is...
  3. RogerH

    PLastic to Fuel

    Different from ? One that I heard about that you can feed with whatever that contains carbon is the Veba Combi Cracker, i.e. including plastics. RH
  4. RogerH

    Steam Superheaters

    Japher Assuming your boiler can operate at a higher pressure, i.e. 50 psig higher than normal I guess it wont be that much of a problem. Re-rating boiler is possible in some occassions. However I sense that there are more underlying factors to your question. Superheating will not affect the...
  5. RogerH

    MDEA losses calculation

    sab19782000 the way I have seen it done before is based on the addition plus a change in concentration after addition. I.e. have the concentration before addition, add a known amount , and measure the concentration after a day or two. All this giving a system volume and also the addition=losses...
  6. RogerH

    The difference of superimposed back pressure on flares

    If understand the question correct it is: "why HP flares have higher backpressure than LP flares". If you have soic speed at the flare tip you cannot get more flow through. The it is a matter of backing u pressure through headers, subheaders back to the source, the PSV and that gives a flow...
  7. RogerH

    VGOHT Feed Filter Pressure Drop

    DDSpetro What type of filter do you have? For similar units like HCU which have backwashable filters this shouldn't affect the throughput. The relation of less wash oil in the coker and shorter run lengths on the filter sound logic. One common problem with cokers is the cyclic behaviour and...
  8. RogerH

    Spent caustic neutralization

    JetAA Doesnt sound like bad flushing if you repeatidly get the problem. If it were bad flushing one would expect longer and longer run lengths. Concentration can have an effect. High NaOH concentrations can exceed the solubility and result in solids dependent on what the caustic contains. One...
  9. RogerH

    Spent caustic neutralization

    JetAA is it a batch neutraliser or continuous one? Have you analysed the salts? Have seen major problems on batch neutralisers but the continous one was operating very steady. Have you checked the netralisation temperature, i.e. at the mixing point, perhaps that can give clue of the mechanism...
  10. RogerH

    Design of Filter System

    KPW82 I have been forced to backflush cartridge filter in some places beacuse no replacements where available. That can extend the filter "life" considerably I usually starts as a no option but when done a few times it usually becomes a rule and there will be a reluctance to change filter at...
  11. RogerH

    Wax Cloud

    Cold flow properties like pour and cloud blend based on indices So if you make belnds with Kero, SRGO, HAGO, LCO etc they will all follow these correlations to a high degree. There are deviations hence you might have to correct the blend to some extent but if the components are analysed...
  12. RogerH

    HGU Reformer

    Ganeshraj The last H2 units I run been KTI design but if I dont remember worng there should be a load controller incl. firing duty and oxygen/air control in HTAS units? Is the air flow on minimum (like min stop ath the damper) or is the draft very low. Sometimes when adjusting the draft the...
  13. RogerH

    HGU Reformer

    Ganeshraj Assume you mean Topsoe (as in Haldor Topsoe) SMR plant 10% sounds a lot, what unit load is this at? A hydrogen unit should, when running above 75% be around 2.5 %. At turndown e.g. 40% you can reach higher numbers such as 6-8% O2. There must be a sample position somewhere down...
  14. RogerH

    Lab sized LPG mercaptan removal problem

    Petrobob Why not pay a visit to e.g. Johnson-Mathew or Haldor Topsoe. They have pilot plants in various sizes and might help you to overcome practical problems effectively. Did see pilots in HTAS (Denmark) for SMR catalyst testing. If that fits your objective remains to be seen. Good luck
  15. RogerH

    Hydrocracking unit

    0707 Being an operator/process guy on hydroprocessing units I would state everything that concerns the high pressure circuit and the warmer it is, the more important it is to insepct. Leaks are the most dangerous things on a high pressure HCU and there are no short cuts that can be allowed...
  16. RogerH

    Ammonia presence in DEA Stripper top stream

    Agree Seen the same also in a MDEA regenerator Need a water addition to reduce the NH3 levels If not the combined high levels of NH3 and H2S might create corrosion and deposits in th gas line This NH3 came from the gas stream to the absorbers Had no consumption of MDEA or any high levels of HSS RH
  17. RogerH

    Flash Point Index

    Calc FI for each component and calc the FI for the blend Blend is based on volume/proportions FLASH INDEX = 10^(-61188+43452/(FLASHPOINT+383) FLASH POINT = 4345.2/(LOG (FLASH INDEX) + 6.1188) - 383.0. WHERE FLASH POINT (ABEL) IS IN degF. RH
  18. RogerH

    H2 Manufacturing unit HTS Reactor DP Increase

    1906 You mention your configuration without prereformer and feeding naphtha, 100% naphtha I assume. Sounds unusual to me. What is your conversion in the reformer on naphtha? RH
  19. RogerH

    Claus unit incinerators

    Dear all We have recently started a discussion on ocygen analysers located in incinerators (thermal oxiders) at the tail end of sulphur units(claus). In this location the licensor have decided that an oxygen analyser in the incinerator is not needed. From the previous plants I have been at the...
  20. RogerH

    heat recovery

    rgokkam I guess erosion/velocity increase only removes the fouling. Perhaps combined with some thermal chock as well. Haven't checked the flow regimes myself and now I dont have the DS available. Know that it works, BP "developed" this method in the mid 80's and on my previous refinery this...

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