• What is the expected volumetric efficiency in the diesel product treating only SRGO? (It is understood that it is less than 103.4% due to the decrease in the content of aromatics and olefins)



  • Barry Dallum, Alternative Petroleum Technology LLC, bdallum@altpetrol.com

    It depends on the sulfur and contaminents concentrations. For typical compositions no changes in volume are noted when oxytreating.



  • Marcio Wagner da Silva, Petrobras, marciows@petrobras.com.br

    Volume swells in hydrotreaters are strictly related with the process severity applied once the volume gain is determined by aromatics and olefins saturation. In other words, higher hydrogen partial pressure and LHSV (Liquid Hourly Space Velocity) tends to raise the volume gain in typical diesel hydrotreaters, obviously the catalyst is also responsible for the volume swell.

    Considering this fact it's important to understand that volume swell is directly related with hydrogen consumption and it's important to quote that aromatics saturation is a reversible reaction under higher temperature which is a characteristic of hydrotreaters processing highly sour feeds, in this case the volume swell tends to be lower. 

    In summary, it's very difficult to precise the volume swell for a hydrotreater considering that this parameter depends on feed quality (more aromatics can lead to higher volume swell), catalyst, LHSV, hydrogen partial pressure, etc.


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