Discussion on the components at the vacuum pump inlet
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Hello, fellow sailors. I’ve run into a problem recently and hope you can all help me out! The question is as follows: “In a vacuum tower, the components at the top of the tower go into the reflux tank via 1 cooling unit and 2 cooling units; the vacuum pump creates a vacuum through 2 cooling units. The issue now is that I want to know the amount of organic substances that are removed during vacuum creation – how should I choose a model for this?” I now go directly from the top of the tower to the flash tank. The temperature and pressure in the flash tank are set such that the temperature corresponds to that after two stages of cooling, while the pressure is equal to the vacuum level in the reflux tank. As a result, no gas escapes from the top of the flash tank; all gas flows out from below it. This actually indicates that, at these temperature and pressure conditions, the gas phase should be completely condensed. My question is: there must be a gas-liquid equilibrium present. When a vacuum pump evacuates, it inevitably removes some of the organic compounds in the gas phase; therefore, the model of the flash tank seems inappropriate. Is there any good solution? ”.
Silently endure it by myself: L:L:L:L:L:L
Aspen cannot calculate this estimate; the amount of loss can only be estimated roughly
The condensed gas phase can be considered saturated gas; thereafter, the corresponding amount of dry air can be determined using standard tables based on pressure and volume. The amount of each component in the gas being pumped out by the vacuum pump can then be determined with relatively high accuracy using temperature and partial pressures
Set the temperature and select vapor fraction = 1
Set the temperature, and choosing vapor fraction = 1 – isn’t that correct?