Hello dear friends,
I have a extra heavy crude that has a 9 API degree and I want to simulate a topping unit in Pro/II. The main probleme is that the crude assay characterization is made from 1% to 50% volume with D2887 not the usual TBP or D86.
I tried to input the data in pro/II but pro/II says that for the method D2887 i can only insert %wt values not %volume values, I tried in hysys to input the values but the same. I read on the internet that the D2887 method is similar with the TBP method so I inputed in pro/II the values with TBP method and %vol. At 55% I have 560 degree C, and Pro/II says that @98%vol I have a temp of aprox 1000 degree C, I crosschecked with Hysys and I got similar results.
But here is the problem.. that I can't undersand. I found some info on the crude from another partner that this crude at 98%vol TBP has a temperature of 820 degree C. From 1000 degree C to 820 degree C is a long way.
So what I'm trying to find out is how to input the D2887 crude assay data into Pro/II in %mass (i have in %vol). Is there any coreletions between D2887 and TBP ?
In Pro/II i used Peng-Robinson, and some heavy oil option which affect the final viscosity of the simulated crude, The values between 50 - 98% didn't differ to much.
Any advice regarding simulating heavy crude oils and how to convert D2887 %vol to TBP %vol are welcome.
Thank you very much.