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Recent Questions
Date  Replies
12/12/2017 Q: In the regeneration of catalyst, the SR of catalytic reforming unit fixed bed reactor.
Could any one tell me why we keep the O2 between 0.3-0.8mol % in the carbon burn step. Also, in the oxidation step should the O2 be kept at10mol%? Another thing, what will happen to the catalyst if the sulfur in the feed is more than 0.5ppm?
 
09/12/2017 Q: I am interested in the forum's experience on (full) reusing of processing condensates from conventional Natural Gas / LPG steam reforming Units (from all major licensors). I have experience with an ex-KTI (Technip) based NG SMR whereby process condensates are fully a) fully reused in the BFW system post a simple air stripping for removal of dissolved CO2 and b) steam produced (at 40 barg) is used for both internal needs and export to other process user and a steam turbine / generator. The system operates as such successfully for many years. I understand that recent designs (and at higher steam pressures) call for either a) the steam not to be exported or b) a dual steam raising system one for internal consumption (where the process condensates can be recycled) and another for export steam on clean BFW. This, due to issues with organics difficult to be removed from the BFW and generated in the shift reactors.
Any experiences / views on this ?
 
09/12/2017 Q: Can anyone please tell me about the basis of feed cut in and cut out temperatures? How are these selected?
Why is feed cut out temperature always higher than feed cut in?
And how do you calculate hydrogen partial pressure in kero minus hydrotreater, bearing in mind the unavailability of GC?
 
06/12/2017 Q: I wanted to understand the constituents that cause the coloring in say natural gasoline. I'm working on an NGL fractionation unit & the Debutanizer bottoms is routed to a Decolorizer column. Now, I'm not sure what is removed to actually meet the D-156 saybolt color 20 specification. its gas condensate...C5-C20, mercaptans inc heavy mercaptans i.e c5,c6 mercaptab, BTEX. No MEROX unit on the feed stream..so no DSO. Also no N2/ nitrogenous compounds.
I would be very grateful if somebody could share the HC compounds contributing to color other than the obvious DSO/ N2 compounds.
(1)
01/12/2017 Q: In hydrotreator, why do we consider hot separator top pressure as a system pressure? Why do we not consider reactor top pressure or reactor bottom pressure or inlet hydrogen pressure? (1)
Recently Answered Questions
Date  Replies
06/12/2017 Q: I wanted to understand the constituents that cause the coloring in say natural gasoline. I'm working on an NGL fractionation unit & the Debutanizer bottoms is routed to a Decolorizer column. Now, I'm not sure what is removed to actually meet the D-156 saybolt color 20 specification. its gas condensate...C5-C20, mercaptans inc heavy mercaptans i.e c5,c6 mercaptab, BTEX. No MEROX unit on the feed stream..so no DSO. Also no N2/ nitrogenous compounds.
I would be very grateful if somebody could share the HC compounds contributing to color other than the obvious DSO/ N2 compounds.
(1)
30/11/2017 Q: How would you design a reformer used in production of hydrogen from used oil? (1)
01/12/2017 Q: In hydrotreator, why do we consider hot separator top pressure as a system pressure? Why do we not consider reactor top pressure or reactor bottom pressure or inlet hydrogen pressure? (1)
22/11/2017 Q: I have a question about light alkanes isomerization catalysts. UOP experts suggested that the silicon can poison hydrotreating and hydrocracking catalysts due to damaging the Al2O3 structure. I wonder if silicon can also poison the light alkane isomerization catalyst, such as chlorited Pt/Al2O3 catalyst, Pt/SO4 catalyst which contains Al2O3 as coagulant, and Pt/zeolite catalyst? Our partial feed for light naphtha isomerization unit is the raffinate from Benzene extraction unit, the raffinate is possible to have silicon due to using defoaming agent at top of benzene distillation extractor. (3)
05/11/2017 Q: Why do we need to keep antisurge valve open 20%to30% open in RGC and why have they given margin for antisurge controller PID? (1)
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