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Epoxidation Of Allyl Chloride With H2O2Catalyzed By Reaction-Controlled Phase-Transfer Catalyst Under Solvent-free Conditions

Posted on:2012-04-12Degree:MasterType:Thesis
Country:ChinaCandidate:S LiuFull Text:PDF
GTID:2251330425962453Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
Epichlorohydrin is an important organic chemical substrate and intermediate. At presentepichlorohydrin production can’t meet the demand in china. Furthermore, present productionroute of epichlorohydrin is poisonous to environment. Aim to industrialization, this paperexplored a highly reactive, green route for epoxidation of allyl chloride under solvent-freeconditions.Epoxidation of allyl chloride without solvent catalyzed by reaction controlled phasetransfer catalyst [(C16H33(70%)+C18H37(30%))N(CH3)3]3[PW4O16] using H2O2as oxidant wasdescribed.Firstly,the catalytic system of allyl chloride epoxidation was optimized. Under theoptimized conditions (allyl chloride/H2O2/catalyst (molar ratio)=400:100:1,5055oC,3h.8587%yield of epichlorohydrin was obtained. The catalyst can be reused with good stabilityin the presence of NaH2PO4. The structure and the composition of the fresh catalyst and therecovered catalysts were investigated by31P MAS NMR spectra. The results demonstratedNaH2PO4can keep the catalyst stable.Secondly, dynamic of epoxidation reaction of allyl chloride under solvent-freeconditions was studied. It was verified that for the epoxidation of allyl chloride, reactionorder of H2O2is zero. The effects of the concentration of H2O2, NaH2PO4and the molar ratioof allyl chloride to H2O2were investigated.Finally, the decomposition of hydrogen peroxide during the reaction was studied.During the reaction, the higher H2O2concentration is the faster the decomposition rate is.NaH2PO4largely prevented the decomposition of H2O2.
Keywords/Search Tags:allyl chloride, reaction-controlled phase-transfer catalyst, hydrogenperoxide, epoxidation, epichlorohydrin, dynamic
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