Abstract
We present a continuous thermodynamic framework which utilizes the Flory-Huggins theory for calculating sol-gel phase equilibrium properties of polydisperse petroleum resins. The sample resins are separated into sol and gel phases by n-hexane at 10–30°C for 5–12 hours. The molecular weight distributions for feed resin and subsequently separated sol and gel phases are determined by gel-permeation Chromatograph and they are correlated by the gamma distribution function. The equilibrium distribution coefficients between sol and gel phases are modeled by the modified Flory-Huggins equation in which the mole fractions are replaced by a continuous distribution variable index. We found that the Flory-Huggins model with the continuous thermodynamic frame-work fits the measured sol-gel phase equilibrium data will for a wide range of separation conditions.
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