The catalytic synthesis of trioctylcitrate by rare earth solid superacid SO_4~(2-)/TiO_2/La~(3+)

The trioctylcitrate was prepared with the citric acid and 2-ethylhexanol as raw material and used rare earth solid superacid SO2-4/TiO2/La3+.The influence factors of reaction were investigated.The products were analyzed by IR spectroscopy.The results showed that the molar ratio of butanol to citric acid was 5.5 ∶1;Catalyst weight was 1.0 g;Reaction temperature was 170～180 ℃;Reaction time was 60 min when added 0.05 mol citric acid.The yield of trioctylcitrate was 97.7%.The catalyst could be easily recovered and reused,and enjoyed such merits as efficient,widely available,easy to carry out,and environmental friendly.