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Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

New parameters such as the resolving power Rp and various separation yield Y are defined to adequately represent fractionation efficiency in molecular weight fractionation by solubility difference. The effect of fractionation conditions (the initial polymer volume fraction vp0, the total fraction number nt and the concentration dependence parameter p of the polymer–solvent interaction parameter χ) on the above efficiency parameters is clarified on binary mixtures consisting of two different polymer-to-solvent molar volume ratio X1 and X2 by using computer experiments, which are equivalent to 2089 single-phase separation experiments. A very high resolving power cannot be expected for a single step of the phase separation. The fractionation, combined with low vp0 and high nt, affords a high separation yield, except for the high molecular weight component fraction separated by successive precipitation fractionation (SPF), whose Y is always zero. In contrast to this, successive solutional fractionation (SSF) enables us to isolate the high molecular weight component much more effectively than the low component.