Hydration of cyclohexene appears to be a promising route to cyclohexanol, much cheaper than oxidation of cyclohexane. The reaction was studied in a liquid C6H10-iquid aqueous-solid zeolite system in relation to type and amount of zeolite, zeolite module, reaction temperature, and solubilizer type. Over ZSM-5, SiO2/Al2O3 similar to100, the selectivity toward cyclohexanol was 99+%; reaction temperature was optimum at 120-130degreesC. Salicylic acid and PhOH used as solubilizers increased the degree of conversion of cyclo-hexene, but contaminated the cyclohexanol product Trials to hydrate C6H10 in a (9:1 w/w) cyclohexene-cyclohexane mixture 3 h at 130degreesC over ZSM-5 gave the organic phase containing 10% cyclohexanol.