Process Conditions and Reaction Kinetics for The Preparation of Chloroethylene Carbonate by Photothermal Method
With the advancement of the lithium battery industry,the demand for vinyl carbonate(VC)as an organic film forming additive is gradually increasing.Chlorinated ethylene carbonate(CEC)is mainly used as an additive in lithium battery electrolytes and as an intermediate in organic synthesis.Consequently,it becomes imperative to conduct research on the CEC,which serves as one of raw ma-terials for VC synthesis.The raw material ethylene carbonate(EC)was subjected to chlorination under ultraviolet light and heating conditions to produce CEC.The effects of process conditions on the prepa-ration of CEC by photothermal method were systematically investigated through variations in reaction time,reaction temperature and chlorine flow rate.The EC conversion and CEC yield were measured u-sing gas chromatography.The results demonstrated that the reaction time,reaction temperature and chlorine flow rate exert significant influences on the synthesis process of CEC.Considering both CEC yield and by-product yield,the optimal process conditions were determined as follows:reaction time 4 h,reaction temperature 85 ℃,and chlorine flow rate 80 mL/min.The preparation of CEC was deter-mined to involve a free radical reaction through the addition of free radical inhibitors.By investigating the conversion rate of the feedstock at various times intervals,it was established that the reaction fol-lows first-order kinetic.
chemical reactionorganic compoundpreparationchromatographyradicalreaction ki-netic
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