Modeling Diesel Hydrotreater Using Petroleum Shift Reactor

Diesel Hydrotreater Using Petroleum Shift Reactor

1. Ensure that the case has an assay attached to the flowsheets fluid package. Add a Petroleum Shift Reactor unitop on the flowsheet.2. Open the Design>Connections page and add desired feed, product, energy, calculated feed (if any) streams.

3. Go to Design>Model Data page and specify the model independent variables.

4. Select Feed Sulfur Wt %, Feed Specific Gravity, Feed Cetane Index, Feed flowrate as the independent variables.

5. Specify the base yields for the products and the calculated feeds. For the calculated feeds the base yield will be negative as the flow is in the inlet direction.

6. Specify the base and shift values for the model independent variables.

7. On the Product Specs>Product Cuts page specify the Temperature, IBP and FBP of the products and calculated feeds. Note that calculated feeds are treated almost as products in model calculations except that (1) the flow is treated negative for material balance purpose, and (2) properties cannot be shifted.

8. On Product Specs>Assay Properties page select properties you want to shift. For the Hydrotr. Diesel stream select Sulfur Content and Liquid Density as the properties to be shifted.

9. On the Product Specs>Property Shift page specify the base and shift values for the properties.

10. Now specify the flowrate, temperature, pressure and composition for the DS1 feed stream. Since some of the feed properties are model independent variables, ensure that the feed has all the specified properties. If a property is missing you can see a trace warning message.