Dissertation > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives > Carboxylic acid derivatives of the function > Carboxylic acid anhydride

Study of Succinic Anhydride and γ-butyrolactone Prepared by Selectivity Catalytic Hydrogenation of Maleic Anhydride

Author GuoShaoFei
Tutor ShiLi
School East China University of Science and Technology
Course Oil and Gas Storage and Transportation Engineering
Keywords maleic anhydride succinic anhydride γ-butyrolactone hydrogenation nickel
CLC TQ225.23
Type Master's thesis
Year 2013
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In this thesis, the nickel-based catalyst is studied for the hydrogenation of maleic anhydride (MA) to succinic anhydride (SA) and γ-butyrolactone (GBL). Three series of catalysts were prepared which has a higher activity for the formation of succinic anhydride or γ-butyrolactone. In the fixed-bed micro-reactor for catalytic reaction, the catalyst supporter, active ingredients, preparation conditions and reaction conditions, such as the reaction temperature, the reduction temperature, WHSV and H2/MA molar ratio, were optimized screening to make the catalyst reaches the highest activity and obtain the desired product. The catalysts are characterized by X-ray diffraction (XRD), H2temperature programmed reduction (TPR) and thermogravimetric analysis (TGA) spectroscopy. The results show that the catalysts produced by different preparation methods have a different impact on the activity of the catalyst. Experimental results show that, Ni/ZnO/γ-AlO3and Ni/Diatomite catalyst prepared by the kneading mathod, has a very high activity in the hydrogenation of the maleic anhydride, and the conversion of MA is over97%, and selectivity of SA is more than96%. Nickel-based catalyst prepared by kneading mathod has high activity for hydrogenation of MA to produce SA. Ni/TiO2-Al2O3catalyst prepared by coprecipitation has high activity for hydrogenation of MA to produce GBL. The study results indicate that whatever mathod the catalyst prepared by. NiO and has a strong interaction with the support Al2O3. Introducing ZnO and TiO2can effectively reduce the interaction between the active metal and a carrier to increase the hydrogenation activity of the catalyst. It is found that the copper catalyst Cu/Al2O3which has lower activity for hydrogenation of MA in continuous fixed bed reactor than the Ni-based catalyst. But when the space velocity decreased to0.9h-1, Cu/Al2O3catalyst has high activity, and the conversion of MA reached75%, the selectivity of SA is about53%, the selectivity of GBL is up to about47%.

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