The cloud point composition and flory-huggins interaction parameters of polyethylene glycol and sodium lignin sulfonate in water-ethanol mixtures Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cf95jf14p

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  • In designing a solubility based separation process for solvent recovery of an organosolv pulping process, the phase behavior of polymeric lignin molecules in alcohol - water mixed solvent should be known. In this study, sodium lignin sulfonates (NaLS) samples were fractionated into three different molecular weight fractions using a partial dissolution method. The cloud point compositions of each of the three fractions were determined by a cloud point titration method. The experimental data were correlated using the three component Flory - Huggins equation of the Gibbs free energy change of mixing. The binary interaction parameter between water and that between ethanol and NaLS were found to be a weak function of the NaLS volume fraction, while that between water and ethanol was strongly depend on the solvent composition.
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