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Date  Replies
27/10/2018 Q: VDU OVHD off gas after treatment in amine (MDEA) absorber routed to VDU furnace to serve as secondly source of firing along with Refinery FG (low in Sulfur)..
H2S in treated offgas is 100ppm (design 0.1%). However, Sox (SO2) in final four gas is high?? Reason?
We checked other Sulfur species's presence which are contributing high SOx. Any way to treat other Sulfur compound and bring Final emission under control??

(5)
05/11/2018 Q: What would be the effect of fluctuation in regeneration gas flow in UOP Cyclemax Regenerator if my flow is having variation by 5-8%?? Will there be any effect on catalyst coke burning? What could be the reason for flow variation? (3)
07/10/2018 Q: What is minimum H2S level maintain in UOP naphtha hydrotreating reactor recycle gas? why naphtha hydrotreating reactor can not purge at what temp? (5)
28/06/2018 Q: Currently, I am trying to reduce the sulfur concentration from the hydro-treated naphtha. After reading up a few articles I came to the conclusion that the sulfur concentration is due to improper stripping of H2S from the stripper column. I have to improve the performance of the stripper column to reduce the sulfur concentration by adjusting pressure and R/F.
How do I proceed? Is there any other sources of sulfur that I have to pay attention to?
(6)
23/08/2018 Q: I am working in VGOHDT. We are facing flaring issue intermittently in Fractionator overhead drum. We are using split range controller for maintaining pressure using fuel gas and excess pressure will release in LP flare.
But we found that the overhead gas composition consist about 51% hydrogen ,23% methane and 14% nitrogen respectively which are non condensable gases. We increased HP steam in stripper column and reduce the pressure in Cold LP separator for removing it but problem persist. Kindly give suggestion to reduce H2 and methane to reduce flaring in Fractionator?
We are operating fractionator pressure at 1kg/cm2 and top temperature at 106 deg c.Overhead Finfan outlet temperature at 45 deg.
(7)
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