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  • Users: Milutin
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  1. Milutin

    Slop processing on Visbreaker Unit

    Dear all, We want to start processing refinery slop oil on Visbreaker oil. Slop properties are similar to light crude oil, but can contain up to 5-10% water. My question is how and where to connect slop line to visbreaker unit. Regards, Milutin
  2. Milutin

    Flare capacity problem

    Dear all, In our refinery we have some PSV designed to discharge to atmosphere, most of them are on top of ADU, FCCU and visbreaking main fractionators. Because we consider that as safety and environmental issue we want to connect them to flare. This is problem because when we calculated...
  3. Milutin

    SR naphtha reforming

    Hi all, Is it possible describe clear symptoms for following reformer problems: - metal poisoning - overchlorinated catalyst - underchlorinated catalyst - catalyst end of life - problems caused by poor regeneration Our reformer has following deviations from normal operations: - low dT on...
  4. Milutin

    VDU ejector off gas

    Off gas from the refinery vacuum distillation unit is routed to fired heater. Off gas is rich in H2S and results with increased SO2 emmision from VDU heater. What are the cost effective solution available to remove H2S from this stream? Regards,
  5. Milutin

    Refinery own consumption and loss

    What is best performers (and not so best performers) own consumption and loss for an modern oil refinery in Europe region? Regards, Milutin
  6. Milutin

    Increased nitrogen content

    Hi all, If nitrogen content is increased in naphtha reformer feed, hydrogen content in reformer recycle gas will be increased. One of negative effects will be deposition of NH4Cl on reformer equipment. What is reaction mechanism which cause increased hydrogen content in recycle gas and how it...
  7. Milutin

    Waste water accumulation

    Hi all, During last year refinery accumulated about 10000 m3 of waste water, because it was unable to processes it. Waste water is accumulated in tank (big one). WW properties: pH 9 H2S 0.4wt% Mercaptans 0.2wt% Ammonia 10000 mg/l Water also have significant percent of oil. Does anybody...
  8. Milutin

    API separator outlet specification

    Hi all, Does anybody have experience what is usual refinery API separator water outlet specification (or values) regarding: - oil and sediments - H2S - RSH - BTX - or some other Intention is to send this water to further treating. Regards, Milutin
  9. Milutin

    ULSD oxidative stability

    Hi all, Recently we faced problem with ULSD oxidative stability in our product tanks. We see this problem for first time. ULSD is produced on HDS unit, from SR light gas oil and we add additive for lubricity, based on fatty acid esters. Does overdosing of this additive can cause stability...
  10. Milutin

    Nitrogen content in Hydrotreater Make-up Gas

    Hi All, We have possibility to use hydrogen reach gas with 15%mol nitrogen as diesel hydrotreater make-up gas. In may opinion this nitrogen will concentrate in recycle hydrogen stream, as part of hydrogen is consumed by process, nitrogen concentration will increase and H2 partial pressure will...
  11. Milutin

    Naphtha hydrotreater catalyst deactivation by lead

    Dear all, Our naphtha hydrotreater feed is straight run naphtha from ADU unit, it prepare naphtha for platformer unit. Lead content is all time below detection, below 10ppb. There is an idea to process slop oil which contain lead on ADU by blending small quantities of slop oil together...
  12. Milutin

    Visbreaking naphtha H2S content

    Hi all, What should be VB naphtha H2S content after naphtha stabilization in stabilizer column? During last run we have some troubles with rebioler feed tray and in such unstable conditions we had RVP 0.46bar and H2S content 0.16%wt. Regards, Milutin
  13. Milutin

    CDU Design Detail

    Hi all, In previous Petro0707 post thread483-197804 we have seen interesting detail. Part of liquid drawn from chimney partial draw off tray is routed to tray below without any cooling, red line on attached picture. My question is what is purpose of this stream? Regards, Milutin P.S...
  14. Milutin

    MEROX sweeting or exstraction

    Hi All, We use sweeting type merox unit to treat light FCCU naphtha. In this way sulfur content in light naphtha is unchanged. Does anybody use extraction merox unit to treat FCCU light naphtha, to decrease sulfur content? What are main factors to decide which merox type to use for one...
  15. Milutin

    N2 in naphtha reformer feed

    Hi all, Few weeks ago we noticed higher nitrogen content in straight run naphtha, which is feed for HDS unit before entering reformer unit. Usual nitrogen content in SR naphtha is 1.5 to 1.0wppm, and below 1wppm in hydrotreated naphtha. Now we have nitrogen content about 3.5 to 4.5wppm in SR...
  16. Milutin

    Thermowell fracture

    Hi all, On crude unit we have for pass fired heater with thermocouples on each pass exit. We experienced thermowell fracture two time in last three years. When thermowell is broken crude oil start leaking. It is very unpleasant situation because of high crude oil temperature and possibility...
  17. Milutin

    Sulphuric Acid Tank Rupture

    Few weeks ago we have sulfuric acid tank rupture; sulfuric acid concentration is 98wt%. Rupture happens below outside plate heater. Plate heater is copper plate, dimension 1m x 0.5m, heating medium is low pressure steam, it is mounted on tank wall (bottom of tank) under stone wool insulation...
  18. Milutin

    Alky Unit

    Dear all In our refinery as I suppose in many other refineries we are short for i-C4 as feed to alkilation unit. As I know for C4 alkylation unit, ratio of C4 olefins an i-C4 is about 1:1.2 respectively. And we run our alky unit in that manner, it is sulphuric acid alky unit. During discussion...
  19. Milutin

    Pyro gasoline

    In our refinery we buy pyro gasoline from petrochemical complex, we treat pyro gasoline on hydrotreating unit to remove olefins and after hydrotreating it is sent to Sulfolane plant, aromatics extraction. Usually pyro gasoline color is between +30 and +20 saybolt, but we started to receive pyro...
  20. Milutin

    Alkilation unit spent caustic

    Dear all Is it possible to reuse spent caustic from sulphuric acid alkilation unit within refinery?

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