الفهرس 
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Abstract
This work was initiated to investigate the effect of the different process parameters on the net yield of epoxides by in situ epoxidation using peracetic acid. unlike previous studies in this area, the influence of these parameters was studied in view of their effect on the rate of oxirane formation, on one hand, and their effect on the rate of oxirane cleavage, on the other hand.
Therefore, the experimental work conducted throughout this thesis included two major parts, one concerns with the effect of the process variables on the kinetics of oxirane cleavage.
In the first experimental part of work, the rate of oxirane formation was studied using a methylated blend of cottonseed and linseed oils using in situ generated peracetic acid at 40,60 and 70 c. Four different types of catalyst were used up to accelerate the formation of the peracid namely, sulfuric acid, p-toluene sulfonic acid, lewatit s100, a gel-type resin; and duolite c 26 resin, a macroporous one. the acid catalysts were used at a level of 2% the weight of the aqueous phase whereas the resin catalysts were used at a level of 10%. the rate of oxirane formation in each individual ester; methyl oleate, linoleate and linolenate, was followed up by GLC analysis of the samples withdrawn during different time intervals.
In the second experimental part, the kinetics of oxirane cleavage by acetic acid was studied using epoxidized soybean oil in presence and in absence of catalyst.
the catalyst types emplloyed in the first part of work were also used in the cleavage study. four different series of experiments were conducted at 60,80 and 92 c using acetic acid in much excess as compared to the epoxy moles so that the reaction can be considered pseudo zero order with respect to acetic acid. the objective of this series was to predict the reaction order with repect to acetic acid was studied in the second set of experiments were conducted to investigated the effect of the catalyst type on the kinetics of the cleavage reaction, with special reference to sulfuric acid.
In all these experiments, the cleavage rate was determined according to the DROP of the residual oxirane moles in the sample withdrawn during the reaction course. the residual oxirane moles in each sample was estimated by the hydrobromination method.