Hi all!
I work as a crude unit process engineer. In our refinery, we are currently facing some problems in the asphalt (bitumen) production. As we are not an asphalt-dedicated refinery, we run time-fixed asphalt campaigns modifying the operating conditions of the vacuum distillation column (VDC).
The adjustments are based on experience and something does not deliver the expected results. We set the vacuum fire-heater outlet temperature, stripping steam and some internal reflux in the slop wax section trying to reach 3 main asphalt properties (viscosity, penetration and ductility).
I could not find information regarding the relationship of these operating conditions and the properties mentioned above. So, would you be so kind to share information / experiences related this issue?
Many thanks in advance!!