Packing Vacuum Distillation with 5 package and empty spaces Aspen Plus V 8.8?

There are several methods to calculate Height Equivalent of a Theoretical Plate in order to model the packed section of the column as if it had trays. Here is one:

http://www.ou.edu/class/che-design/design%201-2013/Column%20Tray%20Design.pdf

Vacuum Distillation Units are quite prone to fouling that will reduce efficiency so you probably will not see more than 2 or 3 equivalent trays between draws in most commercial Vacuum Distillation Units.

Prem Baboo

Dear Armando Lugo

The Aspen Plus simulator is based on the concept that the feed to each module is defined and that the outputs from each module will be calculated. Steps to set up a simulation in HYSYS v8.6 to model a crude tower system consisting of: · Crude Oil Preheat Train · Atmospheric Crude Tower · Vacuum Crude Tower · Debutanizer to stabilize the overhead naphtha stream from the Atmospheric Crude Tower The feedstock to the crude system will be an equal mix of Light, Medium, & Heavy Crude oils.

The four simplest modules are the Pump, Compressor, Valve, and Heater. The Pump and Compressor increase the pressure of the feed stream based on one of the following:

1. Specify the outlet pressure and calculate the needed power.

2. Specify the power input and calculate the outlet pressure.

The Valve calculates the new thermodynamic properties of the stream following a given adiabatic pressure decrease. The heater changes the discharge temperature of the module based on either:

The specified outlet temperature and the calculated the enthalpy flow, or

The specified enthalpy flow and calculated the outlet temperature.

In Aspen Plus, we need to be sure that

1. The feed is either fully specified or will be properly calculated by an upstream module.

2. The operating pressure of the column is known.

3. The pressure drop in the column can be specified.

4. The number of stages is specified.

5. The feed location is specified

6. We can specify the column energy balance. This is usually done by specifying the reflux ratio.

7. We can specify the column mass balance. This is usually done by specifying the distillate rate.

https://pdfs.semanticscholar.org/1806/6e980333d0a6eb54499e5a8a5f33d89ac28e.pdf

https://www.youtube.com/watch?v=qCPExwuN2CY

https://www.youtube.com/watch?v=KOw-3oqSEpU

Regards,

Prem Baboo

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