Research On Dehydrogenation Of Isobutane To Isobutene

In the Chemical industry,The oil as is non-renewable resources and has very important strategic role in the world,how to use the oil resources reasonable and effectively is related to the long-term development of the national petrochemical industry especially the C4resource.The Isobutylene as the main chemical energy is the production of MTBE,MMA,butyl rubber.The original industrial synthesis of isobutylene method can not longer meet the demand for it.Quickening up the preparation of isobutylene to isobutane dehydrogenation technology improvement and research is particularly important, it is also one of the best way of rational utilization of C4resource.This paper focuses on exploring isobutane dehydrogenation process,What the research in this paper concerns lists as follows:the calculation of thermodynamic parameters of dehydrogenation of butanes,the preparation of dehydrogenation catalysts,the choice of dehydrogenation reaction conditions,the research of dehydrogenation kinetics model and the last we researched a kind of has a high activity V-Fe-Ce-K-O/MgO style-ZSM-5catalyst.The concrete research content as follows:A. We prepared with the catalysts including the different active component and different supports with more times of dipping,investigated dehydrogenation catalytic activity.The first.The catalyst activity of catalysts with active component such as V2O5and Fe2O3and Cr2O3,the result showed that when the catalyst(V2O5/ZSM-5) had a good catalytic effect and stability within2.5h;The second.Based on the V2O5/ZSM-5catalyst we studied the alkaline metal K on isobutane dehydrogenation catalyst performance influence; The third.Prepared the ZSM-5supported with different catalyst active component,the influences of active component on catalyst activity were examined.Through the study we found that the catalyst activity order was V-K-Fe-O/ZSM-5>V-K-Mg-O/ZSM-5>V-K-Cu-O/ZSM-5>V-K-Cr-O/ZSM-5>V-K-Mn-O/ZSM-5>V-K-Zr-O/ZSM-5;The supported catalysts were made of the V-Fe-K-O active component and TiO(MgO, ZSM-5,SiO2,-Al2O3)support and the isobutane dehydrogenation catalytic activity was studied. The results showed that the activity order was MgO>ZSM-5> SiO2>γ-Al203>SiO2>Ti02, except that the experiments was prepared by blending the MgO/ZSM-5(TiO2/ZSM-5,y-Al2O3/ZSM-5) hybrid carier, by dehydrogenation performance test and XRD and TEM and BET characterization methods showed that MgO/ZSM-5carrier catalyst had good catalytic activity;The forth.In order to improve the catalyst activity we introduced the rare earth element Ce,we researched the dehydrogenation properties on V-K-O/MgO-ZSM-5molecular sieve catalys,it showed that the lwt%content V-Fe-K-Ce-O/MgO-ZSM-5catalyst activity was better; the reaction conditions of isobutane dehydrogenation was studied,in the experiments it showed that in the condition of the catalyst calcination temperature600℃, reaction temperature580℃, the space velocity of1400h-1the ordinary pressure the catalyst made the isobutylene have96.84%selectivity and36.51%yield.B. Based on V catalyst,isobutane dehydrogenation intrinsic kinetics model was studied,the dynamics model was and the apparent activation energy was55.14kJ/mol.