Modification Of Bentonite And Removal Of The Olefins From Aromatic Hydrogen With Catalysis

The bentonite is a kind abundant reserve of clay that application is very broad in the fields of petrochemical. However, the quality of bentonite in various regions has a large difference. In this thesis, three type of activated bentonite had been studied on removal of trace olefins from the aromatics. Textural and structural characterizations of the catalysts were performed by means of N2 adsorption, X-ray diffraction, thermogravimetry (TG) and differential thermal analysis (DSC). FTIR spectra of adsorbed pyridine were used to determine the acid properties. The results showed that the catalytic activity of E-zhou bentonite loaded A Lewis acid had a great increase and the optimal loading of A Lewis acid was 15%. The optimal loading of PTA and Al2(SO4)3 were 3%. While Lin-an bentonite as the carrier, the catalysts loaded Lewis acid had a increase on catalytic activity. The optimal loading of A Lewisa was 10%. The catalytic activity of Lin-an bentonite loaded two-component activator increased in all, which the loading of 1%A+1%PMA had the best catalytic activity. The Inner Mongolia particulate bentonite as the support, the optimal impregnated time of loading A Lewis acid was 3 days and the optimal loading of A Lewis acid was 10%. The FTIR results suggested that the modified bentonite loaded with A Lewis acid could increase the weak L acid, L acid and total acid and decrease the B acid. The increasing of catalytic activity was apparently due to increase in the weak L acids sites and decrease in the B acid sites. Under the side stream test in Sinopec Zhenhai Refining & Chemical Company, the effects of catalyst B and C on removing olefins from the aromatics were evaluated. The results suggested that the lifetime of catalyst B increased 60%compared with industrial bentonite, and the lifetime of catalyst C increased 4 times.5.5 tons of catalysts C were applied in Sinopec Qilu Company Ltd., the results showed that the lifetime of catalyst C increased 7 times and the amount of aromatics which were treated increased 4.7 times. The catalyst of developed by ECUST have a large social and economic benefit.