Optimization Design Of Catalytic System Of Epoxidation Of Soybean Oil

Traditional phthalate plasticizers are toxic and carcinogenic.With the improvement of living standards,health consciousness have improved.People gradually found phthalic acid esters plasticizer not only has toxicity and potential carcinogenicity to human body but also bring serious pollution to the environment.It makes people began to look to some environmental harmless plasticizer products.Owing to the epoxy soybean oil have its renewable raw materials avirulent,so it acquire more environmental protection and attention.The traditional methods of epoxy soybean oil caused serious environmental pollution.It has violated the requirement in today's requirement of green chemistry.Therefore,the further research of green technology of soybean oil epoxidation catalytic system has important social and environmental value.It is the current mainstream method of solvent-free method.Three catalytic systems were optimized and the catalyst with the best catalytic performance was selected.The main research contents are as follows.First of all,the effect of hydroxyl radical on epoxidation of soybean oil was studied.The experiment results show that the fenton system,which is formed by TBHP and EDTA,has a certain catalytic effect on epoxidation,but the effect is not obvious.Under optimal conditions:reaction temperature is 45?,the reaction time is 2h,the amount of catalyst is 0.15g,the molar ratio of oxygen source to carbon-carbon double bond is 1.5:1,the epoxy value of the product is only 1.5%.Then,the effects of four kinds of phase transfer catalysts on the epoxidation of soybean oil were investigated,and the products with the best effect were selected to characterize the products.Through the infrared spectrum analysis,the gas phase-mass spectrometry?GC-MS?was used to characterize the products to analyze the catalytic mechanism.Under optimal conditions:reaction temperature is 65?,the reaction time is3h,the amount of catalyst is 3.0g,the molar ratio of oxygen source to carbon-carbondouble bond is 1.5:1,the epoxy value,the conversion and the selectivity of the product could reach 3.5%,53.9%and 78.0%,respectively.Finally,in order to realize the effective separation of the above phase transfer catalyst,different phase transfer catalysts mentioned were further processed to form the ammonium phosphotungstic acid quaternary ammonium salt.The catalyst was used as the catalyst for the better epoxidation.At the same time,the performance of hexadecyl ammonium chloride synthetized with H₂O₂ and TBHP were compared.The catalytic activity was analyzed by means of FT-IR,SEM and so on.In the epoxidation reaction of soybean oil,under the solvent-free condition the catalytic activity was investigated.Then,the catalyst with the best catalytic performance was selected.The experimental results show that the highest epoxy value of the product is the reaction time is 2h.The order of epoxidation effect of reaction under different oxidizing agents was:70%TBHP>65%TBHP>30%H₂O₂ and urea>30%H₂O₂.Considering the environment and economy,it is better to choose 65 tert-butyl peroxide as an oxidant;the ratio of double bond in soybean oil to TBHP molar ratio was 1:1.The reaction temperature plays an important role in the reaction system.The optimum temperature is 65?.Different solvents make different epoxies:acetone is the least effective,the dichloromethane solvent is slightly better than that of solvent-free.However,this chapter chooses to conduct epoxidation without using solvents in terms of green chemistry.