Synthesis Of Propylene Oxide From Propylene Epoxiadation With Oxygen By Biomimetic Catalysis

Propylene oxide is one of most important fine chemicals. Thanks to rapid development of Polyurethane Industry, it enjoys prosperity in these decades and with promising future.Application, market status, production processes of PO and its new technical advance-ment are introduced in this paper. Consideration of deficiencies of these technologies and excellent performance of biomimetic catalysis in hydroxylation, epoxidation of alkanes and olefins, synthesis of PO by propylene epoxidation with oxygen catalyzed by metallporphyrins is investigated in this thesis. Thermodynamics, factors, such as solvent, catalyst, co-reductant, temperature, pressure, reaction time and reaction mechanism are carefully studied and discussed.The most favorable conditions gained are as follows:2.8 X 10-5mol/L of T(o-Cl)PPFe, n(Isobutyraldehyde):n (Propylene)=0.42,80℃,2MPa,2h. Conversion of propylene, yield of PO and selectivity are 32.81%,21.24% and 64.74% respectively.The result shows that the type and mount of reductant plays a crucial role in propylene epoxidation. More than 96% of PO selectivity is gained in usage of benzaldehyde as co-reductant. And no co-reductant, no product.