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Solving DFTProfile for binary mixture with x1 = 1 results in singular matrix #39

Description

@g-bauer
parameters = PcSaftParameters.from_json(
    ['toluene', 'acetone'], 
    '../parameters/pcsaft/loetgeringlin2018.json'
)
pcsaft = HelmholtzEnergyFunctional.pcsaft(parameters)
vle = PhaseDiagram.binary_vle(pcsaft, 300 * KELVIN, 251)
gamma = [PlanarInterface.from_tanh(pe, 1024, 100 * ANGSTROM, 500 * KELVIN).solve().surface_tension() for pe in vle.states]

results in RuntimeError: The matrix appears to be singular. for both end-points (pure substances) of the phase diagram.

The above functionality can be done with a SurfaceTensionDiagram but would it be helpful to handle PhaseEquilibrium inputs for mixtures with x=1?

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