Synthesis Of Epoxyethylbenzene With No-Solvent Method

Styrene oxide is an important chemical material used over a wide range of fie Id,for exmple,as a main material in the industry of medicament,perfumes,resin etc.In order to get higher selectivity of Styrene oxide, it needs a lot of solvent to keep special environment in the tradition stynthesis method.But it mades the production process complexly and increases the cost of production and reduces the economy benefit.In this work,we used styrene and H2O2 as main material,researched the process condition of the synthesis of tyrene oxide on no-solvent condition.The main aspects of work were carried out as follows:Basic on the reaserch formerly, we used quaternary ammonium heteropolyphosphatotungstate by immobilized that made by ourselves as catalyst.The reaserch provided a method of synthesis of epoxyethylbenzene with no-solvent and the epoxyethylbenzene was synthesised successfully.Study the technology of synthesis of tyrene oxide by styrene and H2O2 with the reaction-controlled phase transfer catalyst on no-solvent condition.The effects of reaction time, reaction tempreature,ratio of styrene and H2O2,catalyst dosage and ac dosage on the reaction were studied by single factor experiments and orthogonal experiment. Under the optimized reaction conditions:reaction time 6.5h,reaction tempreature 55℃,n(C8H8):n(H2O2) 1.5:1,16g quaternary ammonium heteropolypho sphatotungstate,2.5g ac and 100 mL styrene,coversion of Styrene is 78%,selectivity to epoxyethylbenzene is 89%.Studied the epoxidation reaction kinetics with isothermal method using the quaternary ammonium heteropolyphosphatotungstate as catalyst. Established that the reaction temperature at 344.15K-352.15K range of reaction kinetics.The apparent kinetics was investigated and obtained:the reaction order of the synthesis was n=2,the apparent reaction rate constant was 1.428×10'L/(mol·h),the apparent activation energy was Ea=102.64kJ/mol.and the apparent reaction rate equation was...