Triethanolamine-stearic acid ester was synthesized in n-hexane by stearic acid and triethanolamine as substrates,acetone powder of lipase remembered pH value.The optimum conditions were as follow:the molar ratio of stearic acid to triethanolamine saturated with water was 3.5∶1,the weight ratio of purified lipase and stearic acid was 100∶1.For absorbing water produced,4A sizing screens were added after 8h,its quality was 1/4 of stearic acid.Yield of esterification was arrived to 71.42% at 60hs.Replacing 4A sizing screen with N2 which is at 0.05Mpa and 4000mL/h,the esterification yield arrived to 74.25% at 60h.Lipase had catalysing activity in lower polar solvent,and the esterification equilibrium arrived while the system water was exceed 36.2%.
