EPOXIDATION OF RAPESEED OIL IN THE PRESENCE OF ACIDIC ION EXCHANGE RESIN DOWEX 50WX2

摘要

Rapeseed oil with iodine value of 102.8 g I_2/100 g (0.405 mol/100 g) was epoxidised using peracetic acid, generated in situ from acetic acid and hydrogen peroxide and in the presence of an acidic ion exchange resin - Dowex 50WX2. The maximum conversion of ethylenic unsaturation amounted to 95.8%, selectivity of transformation to epoxy groups was 96.2% and the yield of epoxidised rapeseed oil was 92.1%. They were obtained at the following process conditions: temperature - 75°C, hydrogen peroxide to ethylenic unsaturation molar ratio - 1.5:1, acetic acid to ethylenic unsaturation molar ratio - 0.5:1, amount of catalyst (Dowex 50WX2) - 20 wt.% in relation to the rapeseed oil, reaction time - 5 h, stirring speed - 1400 rpm.