Preparation Of The Catalyst Used In Preparation Of Triethylenediamine From Ethanolamine

Triethylenediamine is not only the most widely used but also the largest demanded polyammonia catalyst in the aea of polyurethane industry.The known processes for the preparation of DABCO essentially differ through the nature of the starting materials for example ethylenediamine or piperazine and its derivatives but they cost too much,low utlization ratio of atoms.Ethanol could reduced the cost,and the atom utilization rate was high,but the conversion and selectivity was low.The selection of catalyst was the key factor in present.The mechanism of triethylenediamine was studied.Combining with the characteristics of the structure of the catalyst,hierarchical TS-1 zeolite was suitable for the reaction.In the preparation,The factors such as the template agent,organic additives were studied to dicussed the structure,specific surface area and titanium content of the catalyst,.Finally the temputer and the ratio of the water were optimized.Through the studied of the mechanism,moderate acid was suitable for the reaction.In the study of Ti-MOR,Ti-Beta,Ti-FER,Ti-MWW catalyst,mainly considering the influence of the structure characteristics for the reaction hierarchical TS-1 zeolite was suitable for the reaction.In the preparation,only the concentration of the IPAOH,titanium ester and organic additive were changed.The structure and morphology of the TS-1 were emplied using XRD,FT-IR,BET and other technical analysis.TPAOH could not only influence the crystallinity of the catalysts,but also the titanium content.The concentration of TPAOH coiuld improving the crystallinity and skeleton titanium content of catalyst in different degree.Reunion phenomenon was decreased obviously.Organic additives could significantly improve the pore structures of the catalyst,and suppressed titanium into the skeleton.With the concentration of titanium ester increasing,reaction conversion increased significantly.When n(Ti)/n(Si)reached 0.017,the conversion of the ethanolamine reached 90%,the selectivity of the TEDA and PEP could reach up to 33.65%and 26.24%.