Liquid-liquid equilibrium has been measured for 2,3-butanediol + water + solvents (tricholorethylene, tetracholoroethylene 2,4-dimethylphenol, 4-nonylphenol, and 4-nonylphenol + toluene) at 25-degrees-C for chlorinate hydrocarbons and at 40-degrees-C for phenolic solvents. The consistency of the results for phenolic solvents was checked with the Othmer-Tobias, Bachman, Hand, and Campbell correlations. UNIQUAC and NRTL equations were used to correlate the results for 2,4-dimethylphenol and the NRTL equation for the results with 4-nonylphenol. The 4-nonylphenol + toluene system gives the best distribution coefficent for the systems tested. Back-extraction of 2,3-butanediol was carried out by contacting the organic phase containing the solvent with NaOH.