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There is any safe limit for chlorine for DCU feed?
Replies: 1
Our aviation kerosene silver corrosion test is good, but copper corrosion is bad. What is the possible reason for this situation.
Replies: 2
What could be done for de-aromatization of uncoverted oil (UCO or off test) from hydrocraker unit? Could hydrotreating be effective or not? In the other words, is it possible to saturate PNA's (which they are in the UCO) by hydrotreating?
Is it feasible to process slack wax in a delayed coker? If so, what are the potential benefits and operational challenges?
How can AI capabilities improve machinery performance challenges?
Replies: 3
Can you comment on the shift in FCC product economics beyond 2025?
Is there a real world justification to include a surge analysis case for valve stem failure in a butterfly valve? Cargo export between tank ships.
Replies: 0
How much sodium is the limit expressed in mg/kg that can be loaded into a Visbreaker system without causing excessive scaling or coking in the oven?
Are there any methods to reduce coker furnace fouling through chemical injection in furnace tubes .
If yes, how was the experience?
Has any coker seen an effective Coker Furnace higher run length by Chemical injection.
If yes what were your observations?
With more emphasis on a CO₂ tonnage per dollar investment basis, which metrics matter in pursuing opportunities in petrochemicals or low-carbon fuels?
What opportunities do you see for the integration of biorefineries with steam crackers?
What options are available for increasing the number of higher octane gasoline components?
Replies: 5
A TGT that uses a steam heater to raise the temperature is experiencing a drop in quencher pH after shutdown maintenance and startup. In this TGT, passivation was done at shutdown for shutdown maintenance, and pre-sulfurization was done at startup and startup. The TGT reactor has thermometers at the top, middle, and bottom, and since startup, the temperatures at the middle and bottom have been the same, indicating that the catalyst in the lower layer is losing activity. The operation to raise the pH of the quencher with caustic soda had to be repeated two to three times a day, and by raising the H2S/SO2 of the SRU upstream to 5, the SO2 leak from the reactor was reduced, and the quencher pH drop is now only once a week. No unusual operations have been performed. The catalyst has been in use for 10 years, which is not a short period of time, but we do not believe it is a period of use during which a rapid decline in activity occurs. If anyone has experienced similar problems or has knowledge of the possible causes of the problems, it would be helpful.
In the event of an emergency shutdown of the FCCU, coke in the reactor and reactor cyclone may be peeled off. On the other hand, a significant period of time will be required to remove the coke. In the event of an emergency shutdown, how should we determine whether or not coke removal is necessary?
Why should water boot be vertical? We want to implement water wash of overhead condenser, but 3 phase separator is bottleneck, esspecially water boot. We can not extend it verticaly, to get more residence time for water (space limitations). Potential option is to extend boot horizontaly - to increase its DIA to bi as wide as vessels, or to change boot with another smaller vessel, to provide residence time. Are this options even applicable or must hold on to already proven solution, like vertical boot?
Replies: 6
What is the typical particle size for HCGO Backwash filters? The frequency of the HCGO backwash filter has increased significantly when the wash oil amount is decreased in the unit. I have checked the data sheet which states that coke particle size>20 microns. Have you encountered any issues with HCGO backwash filters before? If the problem is not related to the filter size, what other factors might be causing it?
What are the positive and negative implications on coker operation associated with the introduction of FCC slurry oil into the feed?
In a hydrogen production unit designed by Haldor topsoe, we have a latent heat exchanger, that vaporizes natural gas by HPsteam, and a condensate pot. The effluent entering the heat exchanger is HP Steam and the exit of the heat exchanger is steam condensate enters the condensate pot from the middle. Between the top of the pot and the heat exchanger there is a line connecting them together. Steam pressure is 70.5 kg/cm2. The operating pressure of the pot is also 70.5kg/cm2. What is the the purpose of the line connecting the condensate pot to the heat exchanger? By the way, there is a PSV installed at the top of the condensate pot The PSV pressure is set 79.5 Kg/cm2.
How are technology suppliers dealing with attracting young professionals to the industry?
What heat and mass transfer technologies are helping the industry lower Opex?
Under what conditions do you see opportunities for blending petrochemical byproducts with refinery fuel feedstocks to lower conversion costs?
What role does artificial intelligence (AI) play in revamping downstream facilities that are scaling back on conventional fuels production while upgrading to capture value from new products?
What technology and strategies can resolve the huge gaps between ethylene and propylene production in certain markets?
Replies: 4
What technologies do you see dominating the long-term development of alternative fuels like ammonia, methanol, and hydrogen?
Our desalter is facing a rag layer issue when we process cabinda crude. The brine turns black. It seems like our current emulsion breaker can not solve this problem. Is there any ideas or recommendations?
Replies: 7
What are types of Corrosion Inhibitor (Filmer) and neutralizing amine used in crude distillation units. What is the philosophy of their work and the concentration of injection?
We have a black sludge formation at the interphase of naphtha and water in OVHD accumulator. But all the OVHD paramters like pH, Iron and Chloride are normal. The crude unit has a partail condensation ovhd system and the black sludge is observed in the second boot (Cold reflux boot). There is a CI dosing in the accumulator upstream. What could be the reason for this sludge?
I would like to learn about the usage of Pyrolysis oil produced from Ethylene Cracker in the Delayed Coker Unit. I would like to use this pyrolysis oil which is around 2.5 wt% of total feed as a feed in the Delayed Coker Unit. Do you know any applications like this? If it is, have you encountered any issue to process pyrolysis oil to the coker unit?
In addition, what if I use this pyrolysis oil as wash oil stream in the coker fractionator column instead of using as a feed? Do you know any applications or example?
With the most profitable refiners focusing on the production of basic chemicals such as aromatics, olefins, and polyolefins, what catalyst and reactor technology is key to this focus?
In a crude processing unit we have two stages of separation (gas, oil & water) and two stages of desalter. I need to know if we should heat the crude between two separators or before the first desalter? and why?