Aspen was used to regress the binary interaction parameters for cyclohexane and heptane, and the value obtained was negative
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By looking up the TXY values of cyclohexane and n-heptane at atmospheric pressure in the literature, and performing data regression in Aspen, it was found that Kij is negative. I don’t know what the problem is
Bro, where did you find the TXY values for cyclohexane and heptane? Could you share the literature?
It doesn’t say that the binary interaction parameter cannot be a symbol; as long as the calculated vapor-liquid equilibrium is close to the experimental vapor-liquid equilibrium, that’s sufficient.