Carrier of ethylene oxide silver catalyst, and its preparation method and application

A technology of silver catalyst and ethylene oxide, which is applied in the direction of catalyst carrier, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of low water absorption of the carrier, unfavorable deposition of active components and additives, etc., and achieve selectivity Improved effect

Active Publication Date: 2007-08-01
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water absorption rate of the carrier prepared by this method is low, which is not conducive to the deposition of active components and additives; moreover, there are many pores less than 5 μm, which will have some adverse effects on mass transfer and heat transfer in the direct oxidation reaction process of ethylene

Method used

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  • Carrier of ethylene oxide silver catalyst, and its preparation method and application

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preparation example Construction

[0042] In the preparation of the silver catalyst of the present invention, firstly, the aqueous solution of silver nitrate is reacted with ammonium oxalate or oxalic acid aqueous solution, and the silver oxalate precipitate is precipitated. Add additives to the aqueous solution of amines such as pyridine, butylamine, ethylenediamine, 1,3-propylenediamine, ethanolamine or their mixtures to form an impregnation solution. Then use the obtained impregnating solution to impregnate the above-mentioned alumina carrier for 30 minutes under the condition that the vacuum degree is less than 10mmHg, drain it, and place it in an air stream or a nitrogen-oxygen mixture with an oxygen content of not more than 21% (such as 8.0% oxygen) at 180 ~ The temperature range of 700°C, preferably 200-500°C, is maintained for 1 minute to 120 minutes, preferably 2 minutes to 60 minutes, for thermal decomposition. Silver oxide can also be used instead of silver nitrate, and silver oxalate can also be dir...

Embodiment

[0065] The present invention will be further described below in conjunction with examples, but the scope of the present invention is not limited to these examples.

[0066] Preparation of Carrier Comparative Examples 1 and 2

[0067] 50~500 mesh trihydrate α-Al 2 o 3 312g, fake monohydrate Al greater than 200 mesh 2 o 3 92g, petroleum coke 0 and 81g, NH 4 F 7g and Mg(NO 3 ) 2 8.5 g was put into a mixer and mixed uniformly, transferred to a kneader, added 0.12 liters of dilute nitric acid (nitric acid: water=1:3, weight ratio), and kneaded into a paste that could be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10%.

[0068] The preparation of carrier embodiment 1-3

[0069] 50~500 mesh trihydrate α-Al 2 o 3 312g, fake monohydrate Al greater than 200 mesh 2 o 3 92g, 5, 11 and 21g of petroleum ...

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Abstract

The invention involves alumina carrier used for Ag catalyst which is used for produce epoxyethane with oxygenizing ethane and its preparation method the Ag catalyst prepared by the carrier, and relates to the usage of the catalyst in ethane oxygenizes epoxyethane. The preparation method mixes three-hydratedalpha-aluminum oxide with certain particle size, hydratedalpha-aluminum oxide, certain amount of inflammable carbonaceous material, fluxing agent, fluoride and optional heavy alkaline earth metal compounds, adds admixture and water after mixing uniformly, kneading uniformly, squeezing and shaping, then preparingalpha-alumina carrier after drying and roasting. The specific surfaceof the invention is 0.2- 2.0m2/g, the hole volume is 0.35-0.85ml/g, water absorption ratio>=30%, crushing strength is 30-120N/ particle. The carrier is dipped by the solution of silver ammine complex, alkaline metal compound and alkaline earth metal compound, and prepares the Ag catalyst for epoxyethane with oxygenizing ethane after drying and activating.

Description

technical field [0001] The present invention relates to a kind of carrier for silver catalyst, its preparation method and application thereof, more specifically the present invention relates to a kind of alumina carrier for silver catalyst of ethylene oxidation production ethylene oxide, its preparation method and The silver catalyst prepared by the carrier also relates to the application of the catalyst in ethylene oxidation to produce ethylene oxide. Background technique [0002] Under the action of silver catalyst, the oxidation of ethylene mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water. Among them, activity, selectivity and stability are the main performance indicators of silver catalyst. The so-called activity refers to the reaction temperature required when the production process of ethylene oxide reaches a certain reaction load. The lower the reaction temperature, the higher the activity of the catalyst. The so-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J23/50B01J37/02C07D301/03
CPCB01J21/04B01J35/1042B01J37/0201B01J35/1009B01J23/50C07D301/10B01J35/1076B01J37/0236B01J35/1038Y02P20/52
Inventor 陈建设张志祥李金兵高政金积铨任冬梅孙欣欣倪秀
Owner CHINA PETROLEUM & CHEM CORP
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