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Composite iron-zinc catalyst precursor, catalyst prepared from composite iron-zinc catalyst precursor, preparation methods of composite iron-zinc catalyst precursor and catalyst, and applications of catalyst

A catalyst and precursor technology, applied in the application field of butene to butadiene reaction, can solve the problems of reduced catalyst activity, low catalyst butadiene yield, reduced catalyst anti-wear performance, etc., and achieves short reaction time and pore size. The effect of concentrated distribution and stable product properties

Active Publication Date: 2018-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Composite iron-zinc catalyst precursor, catalyst prepared from composite iron-zinc catalyst precursor, preparation methods of composite iron-zinc catalyst precursor and catalyst, and applications of catalyst
  • Composite iron-zinc catalyst precursor, catalyst prepared from composite iron-zinc catalyst precursor, preparation methods of composite iron-zinc catalyst precursor and catalyst, and applications of catalyst
  • Composite iron-zinc catalyst precursor, catalyst prepared from composite iron-zinc catalyst precursor, preparation methods of composite iron-zinc catalyst precursor and catalyst, and applications of catalyst

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preparation example Construction

[0031] The preparation process of the catalyst of the present invention is as follows: ammonia and the acid salt mixed solution of Fe, Zn and M are continuously sprayed into the impeller 2 rotating at a high speed from the feed ports 4 and 5 provided on the impeller cover respectively, and the slurry generated by the reaction is fed by the impeller 2 falls into the reactor, part of the generated slurry enters the circulation pipe 7 through the circulation pipe inlet 6, and the circulating material is sprayed into the high-speed rotating impeller 2 from the circulating material outlet 6 provided on the impeller cover 3, and the generated slurry is discharged from the reaction The overflow port 8 at the top of the device is continuously discharged, and the discharged slurry is filtered, washed, and dried to obtain a catalyst precursor. The catalyst precursor is roasted or shaped to obtain a catalyst, wherein the reaction temperature is controlled at 10-40 ° C, and the residence ti...

Embodiment 1

[0035] Take 666.6g Fe(NO 3 ) 3 .9H 2 O, 392.04g Zn(NO 3 ) 3 .6H 2 O and 49.2g Cr(NO 3 ) 3 .9H 2 O was prepared into 3000mL metal salt solution. The mixed solution of ammonia gas and metal salt is continuously sprayed into the high-speed rotating impeller 2 from the feed ports 4 and 5 provided on the impeller cover respectively, and the slurry generated by the reaction falls into the reactor from around the impeller 2, and the generated part of the slurry Enter the circulation pipe 7 through the circulation pipe inlet 6, and the circulating material enters the high-speed rotating impeller 2 from the circulating material outlet 6 provided on the impeller cover 3, and the slurry generated by the reaction is continuously discharged from the overflow port 8 at the top of the reactor, and then filtered , washed and dried to obtain a catalyst precursor. Among them, the volume fraction of ammonia in the mixed gas is 70%, the atomizing nozzle of the liquid phase feed port, its...

Embodiment 2

[0037] Other conditions are the same as in Example 1, except that the diameter of the nozzle is changed to 18 μm, the circulation rate of the slurry and the volume ratio of the feed amount are 2.5:1, the pH value of the slurry at the overflow port is 7.6, and 49.2g Cr(NO 3 ) 3 .9H 2 O was changed to 35.6gMg(NO 3 ) 2 .6H 2 O, take the sample when reacting for 1h, and obtain the catalyst precursor a 2 and Catalyst A 2 .

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Abstract

The present invention provides a composite iron-zinc catalyst precursor, a catalyst prepared from the precursor, preparation methods of the precursor and the catalyst, and applications of the catalyst. According to the present invention, the precursor is prepared through the reaction of the acid salt mixing solution of Fe, Zn and M and the raw material gas ammonia by using the specific reactor, wherein the raw materials are beaten into fine liquid droplets and gas bubbles through the blade wheel of the reactor, such that the prepared catalyst precursor has the uniform and centralized particlesize distribution so as to easily improve the comprehensive performance of the catalyst; and with the application of the catalyst prepared by roasting the precursor in the butene-to-butadiene reaction, the high activity, the high selectivity and the high stability can be provided.

Description

technical field [0001] The invention relates to a composite iron-zinc catalyst precursor, a catalyst synthesized therefrom, a preparation method and its application in the reaction of butene to butadiene. 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-products 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 molyb...

Claims

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Application Information

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IPC IPC(8): B01J23/86C07C5/48C07C11/16
Inventor 付秋红段日包洪洲张艳侠
Owner CHINA PETROLEUM & CHEM CORP