Study Of Preparation Of Epoxide Olefin By Catalysts

Epichlorohydrin(ECH) is an important organic chemical raw material and fine chemical product; it can be used to synthesize chlorohydrine rubber, epoxy resins, and glycerin. With the rapid development of economy, the demand of ECH is gradually increasing, and so to establish a method of manufacturing with green environmental protection, clean and cheap is urgently required. In currently study, the method of direct epoxidation of allyl chloride(ALC) to ECH using H2O2 as oxidant is most likely to be used in industry. Because it's high active oxygen content, green, clean and low cost process. But the high catalyst prices and difficult recovery is the biggest limiting factor of the method for industrialization.In order to get a better catalytic effect, we combine laboratory research and process optimization. Titanium silicalite-1(TS-1) was synthesized by a sol-gel method using tetrabutyl titanate(TBT) as tita-nium source, colloidal silica(30 wt %) as the silicon source, TPABr as the templating agent insteading of TPAOH which is needed for the crystallization. And then the catalysts was modified with various methods by templating agent, metal salt and alkali salt to improve catalytic activity, including of modification with HCl and metal salt, modification with Na OH and template agent, modification with Na OH, Na2S2O3 and template agent and modification with Na2S2O3 or Na2SO4 and template agent. And the catalyst was characterized by XRD, BET, FT-IR, TEM and catalyst activity was determined for epoxidation of allyl chloride. Experimental results show that the activity of catalyst was increased after modification with HCl and metal salt. After modification with Na OH and template agent, Z-j-TBABr and Z-j-TOABr's activity is increased, and the increase rate is 34.02% and 5.09%. After modification with Na OH, Na2S2O3 and template agent, Z-jy-A336's activity is increased, and the increase rate is 14.32%. After modification with Na2SO4 and template agent, Z-y1-A336's activity is increased. And After modification with Na2S2O3 and template agent, the catalyst of Z-y2-TPABr, Z-y2-A336 and Z-y2-TBABr was increased, and the increase rate is 37.32%, 29.57% and 14.43% respectively. Then modification conditions and process conditions of Z-j-TBABr and Z-y2-TPABr were optimized by orthogonal experiment, and the yield of epoxy chloropropane is 92.46% and 92.46% respectively with the optimal experimental conditions for experiments.Propylene oxide(PO) is a very important organic chemical product. It was widely used in textile, light industry, medicine, chemical and foodstuff industries, etc. Propylene epoxidation catalytic process with molecular oxygen as the oxidizing agent is the most promising and most green study. However, Ag catalyst for propylene epoxidation has low selectivity. Au-Ti catalysts can get very good catalytic performance under mild conditions, and the related technology is promising. But, it has some disadvantages, such as catalyst deactivation easily, the conversion and utilization rate of O2 is low.In my paper, different methods(deposition precipitation, sodium borohydride reduction method) was used to prepare Au/Ti O2, and we investigate the influence of different templates(PVP, PVA, sodium citrate) on catalytic performance. deposition precipitation and sodium borohydride reduction method was used to prepare Ag-Au/Ti O2. The catatyst was characterized by XRD and UV-Vis, and the activity of the catalysts was evaluated.