Synthesis And Properties Of Solid Base Catalysts For Cyclization Of Epichlorohydrin With Dichloropropanol

Epichlorohydrin is an important organic chemical raw material.At present,processes for industrial production of epichlorohydrin have serious "three wastes" problem,needing to invest a lot of manpower,material and financial to treat,and the oil resources are more scarce,and people attach great importance to the world's environmental problems,the first two methods heavily relying on oil resources will encounter the bottleneck,however,the glycerine relying on bioenergy receives strong support from the national environmental protection and sustainable development policy,so glycerol has a good development prospects.In recent years,epichlorohydrin has shown a trend of overcapacity,so the glycerol production process needs to be optimized.We need to improve the shortcomings of equipment and process and reseach new and highly efficient catalysts,so that we can produce high quality epichlorohydrin in a more environmentally friendly and efficient way.Researchers have done a lot of research work and made some progress.In this paper,we study the synthesis of epichlorohydrin from dichloropropanol.The process uses gas-solid heterogeneous reaction system andgets rid of the traditional saponification process.The advantages of the process are as follows: mild reaction conditions,simple process,short flow;less by-products,no industrial waste and environmental pollution;the catalyst is easy to separate,regenerate.In this paper,we use the ECH industrial application as the ultimate goal to study the dichlorohydrin dehydrochlorination reaction with a supported solid base as a catalyst.The effects of the carrier gas flow rate,the temperature of dichloropropanol gasification and the preparation conditions of solid base catalysts on the conversion,selectivity and yield of dichloropropanol dehydrochlorination were investigated.The effects of the surface area and basicity of solid base catalyst on the dehydrochlorination of dichloropropanol were investigated by XRD,nitrogen adsorption desorption,temperature programmed desorption,base strength test checking the physicochemical properties of solid base catalyst.In the best experimental conditions:atmospheric pressure,the carrier gas flow rate of 100 ml/min,dichloropropanol gasification temperature of 80 ° C,pipe insulation temperature 110 ° C,the solid base catalyst with better catalytic effect is selected.The main conclusions are as follows:?1?The effects of different anions on the catalytic performance of solid base catalyst are investigated.It is found that K2O?10%KOH?/?-Al₂O₃ is the best.?2?The effects of different metal cations on the catalytic performance ofthe catalyst are investigated.It is found that the catalytic effect of10%Ba O/?-Al₂O₃ is the best.10%Ba O/?-Al₂O₃ contains a few weak basic sites and a lot strong base sites,which is important factor affecting their catalytic activity.?3?The effect of different metal cations on the catalytic performance of the catalyst are investigated.It is found that the catalytic effect of10%Mg Cl2/?-Al₂O₃ was the best.10%Mg Cl2/?-Al₂O₃ contains a few weak basic sites and a lot strong base sites,which is important factors affecting their catalytic activity.?4?Based on the investigation of the life of solid base catalyst,the stability of 10%Ba O/?-Al₂O₃ is the best.