Catalyst for the preparation of 1,3-butadiene from butene

Abstract

The invention provides a catalyst for preparing 1,3-butadiene from butene, which comprises 35% to 50% of aluminum oxide, 25% to 45% of iron oxide, 12% to 30% of zinc oxide and M Oxide 0.5%~2%; M is at least one of Ca, Mn, Cr, Mo, Mg and Si; the particle size distribution of the catalyst is: less than 50μm 1%~20%, 50~80μm 55%~85% And greater than 80μm 5%~25%. The catalyst is prepared by placing the molded alumina carrier in an impregnating liquid for impregnation, drying and roasting, and the impregnating liquid contains metal nitrate and an organic complexing agent. In the present invention, metal nitrate decomposes and releases gas during the roasting process to realize catalyst particle size shaping, and the organic complexing agent can also play a dispersing role to realize a concentrated and uniform catalyst particle size distribution; the catalyst particle size can also be adjusted by controlling the heating rate of each temperature section . The catalyst of the invention is used to catalyze the reaction of butene to prepare 1,3-butadiene, and has higher activity and selectivity.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a catalyst for preparing 1,3-butadiene through oxidative dehydrogenation of butene. Background technique [0002] Butadiene is the basic raw material of petrochemical industry and an important monomer for the production of polymer synthetic materials. It can be copolymerized with various compounds to make various synthetic rubbers and synthetic resins. At present, there are two main sources of butadiene, one is obtained from the dehydrogenation of the C4 (n-butane and n-butene) fraction of the refinery; the other is extracted from the mixed C4 fraction of the by-product of the ethylene cracking unit get. With the rapid development of my country's automobile industry and tire production, the development of butadiene production technology is progressing rapidly. Butene oxidative dehydrogenation to butadiene catalyst mainly has three systems, namely molybden...

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Problems solved by technology

[0003] CN1033013A discloses a catalyst for oxidative dehydrogenation of butene. The method adopts the co-precipitation reaction of metal salt solution and ammonia water, and obtains a spinel catalyst through catalyst molding and activation. Catalyst selectivity and butadiene yield slightly lower in hydrogen process

CN102580749A discloses a production process of butadiene catalyst by oxidative dehydrogenation of butene. The method adopts co-precipitation and precipitation of metal mixed solution and ammonia water, and then adds activated carbon and binder to the slurry. During the roasting and activation process of the catalyst, its Decomposition will easily reduce the anti-wear performance of the catalyst, and the activated carbon cannot be completely decomposed, which will easily reduce the catalyst activity

The method adopts the impregnation method, impregnating the active metal on the modified carrier, and then filtering, washing, drying and roasting, which will easily lead to the loss of the active metal during the preparation of the catalyst, and the impregnated active metal is easy to aggregate at the same time, resulting in uneven distribution of active centers. uniform

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