III International Conference

PP-III-18manganese. There is large number of catalytic system of these oxides- homogeneous andheterogeneous, different solutions of hydrogen peroxides, different additives, etc.For epoxidation of vegetable oils by hydrogen peroxide we used a tungsten oxide basedcatalytic system. Epoxidation was done by 35 % aqua solution of hydrogen peroxide inimmiscible mediums (oil and water phases) in the presence of tungsten oxide derivatives andphase transfer catalysts.The optimal conditions of rapeseed oil epoxidation were chosen. The study shows that atright proportion of the components epoxidation of rapeseed oil by hydrogen peroxide ontungsten catalyst can be quite effective. Unlike the other catalytic systems of epoxidation withtungsten catalysts our system is efficiently working without using of organic solvents.Depending on the goal, the variation of technological parameters of reaction allows toobtain high value of epoxide number, high value of selectivity peroxide consumption, fasterreaction and low catalyst load. The best results for mentioned indexes are shown in Table 1.Table 1. Results of rapeseed oil epoxidation by hydrogen peroxide in presence of tungstencatalyst and interphase agent.T, o CTime,minMolar ratio,doublebond:hydrogenperoxideCatalystconcentration,% massDegree ofepoxidated doublebonds, %Hydrogenperoxideselectivity, %50 480 1:1,15 0,56 82,9 72,180 60 1:1,13 0,59 77,2 68,165 90 1:0,96 0,56 75,8 79,365 240 1:1,29 0,56 88,9 68,765 240 1:1,37 0,39 78,3 57,0Also was developed catalytic system able to effective rape seed oil epoxidation which canbe used repeatedly, at least two times without loss of product quality. Degree of epoxidationin last cases came nearer 90% when hydrogen peroxide selectivity was near 65%. Howevertime of recycled reaction increased to over 10 hours.502