Aspen simulation of mixture separation problem
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There is a mixture containing H2/N2/C1–C6, and a simple gas-liquid separation simulation was conducted at a pressure of 0.1 MPaG and a temperature of 20°C. The PENG-ROB equation was used to determine the physical properties, with C5/C6 treated as n-alkanes; the result was that the liquid phase flow rate was zero. Under normal conditions of temperature and pressure, C5 and C6 are in liquid state. What’s going on here? Those who don’t practice, please share your insights!
If the amounts of C5 and C6 are not large, it’s normal for them to be entirely in the gas phase; they’re above the bubble point line
As long as the partial pressures of the C5 and C6 components in the gas phase are below their saturated vapor pressures at the corresponding temperatures, no condensate of these components will form.
It depends on the composition; if the contents of C5 and C6 are low, it’s normal to have no liquid phase at room temperature and pressure!