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Silver impregnation liquid and silver catalyst for ethylene oxide production through ethylene epoxidation, and preparation methods thereof

A technology for ethylene epoxidation and ethylene oxide, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. problem, to achieve the effect of improving uniformity and improving uniformity

Active Publication Date: 2019-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers at home and abroad have published many patents on silver catalysts, mainly discussing methods to improve catalyst performance from the perspectives of carriers, additives, and processes, but there are few reports on the impact of the properties of the impregnating solution on the catalyst preparation process.

Method used

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preparation example Construction

[0036] The second aspect of the present invention provides a kind of preparation method of silver catalyst for producing ethylene oxide by epoxidation of ethylene, comprising the steps:

[0037] a. Provide the above impregnation solution;

[0038] b. Vacuum impregnating the carrier with an impregnating solution, and drying the obtained solid phase after leaching and separating;

[0039] c. Thermally decomposing the dried solid phase to obtain the silver catalyst.

[0040] According to the present invention, step a can be achieved in any way, for example, by mixing the organic amine solution, the silver compound, the polar amino acid and optional auxiliary agents at low temperature.

Embodiment approach

[0041] According to a preferred embodiment of the present invention, step a includes:

[0042] 1) Mixing the organic amine solution, the silver compound and optional additives at a temperature below 30°C, preferably 5-20°C;

[0043] 2) Add polar amino acid to the solution obtained in step 1).

[0044] According to a specific embodiment of the present invention, in step b, in order to promote the uniform and sufficient loading of silver, the vacuum impregnation conditions preferably include: the vacuum degree is less than 10 mmHg, the impregnation time is 10 to 60 minutes, and then leaching and drying .

[0045] According to the present invention, the drying can be carried out using conventional equipment and conditions in the art, for example, drying at 30-150° C. for 1-36 hours.

[0046] According to a specific embodiment of the present invention, the thermal decomposition is carried out in an air flow or a nitrogen-oxygen mixture with an oxygen content not greater than 20%...

Embodiment 1

[0068] Dissolve 850g of ethanolamine and 300g of ethylenediamine in 1500g of deionized water, and slowly add silver nitrate into the mixed liquid while stirring, keeping the temperature below 30°C, and adding silver nitrate so that the final impregnating liquid contains silver 23 %(weight). After the silver amine solution is prepared, keep the current temperature, add 7.0g of cesium sulfate, 2.8g of calcium acetate, 3.2g of ammonium perrhenate and 1.0g of cerium sulfate, then add 500g of lysine, and then deionize Water makes the total mass of the solution reach 5000g, and it is prepared as an impregnating solution for use.

[0069] Take 2500g of the carrier sample and put it into a container, evacuate until the vacuum degree is lower than 10mmHg, put the above impregnation solution into it, immerse the carrier, keep it for 30 minutes, and then leach to remove the excess impregnation solution. After the above solid was dried at 60°C for 12 hours, it was heated in an air flow a...

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PUM

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Abstract

The invention belongs to the field of catalysts, and provides a silver impregnation liquid for ethylene oxide production through ethylene epoxidation, a silver catalyst and preparation methods thereof. The silver impregnation liquid for ethylene oxide production through ethylene epoxidation comprises the following components: 1) a silver-ammonia complex; 2) polar amino acid; 3) water; 4) an optional auxiliary agent; wherein based on the total weight of the impregnation liquid, the content of the polar amino acid is 0.05-60 wt%. Compared with the prior art, the uniformity of the silver catalystprepared by the method provided by the invention is improved, and the silver catalyst has higher selectivity and higher catalytic activity for the reaction of producing ethylene oxide by ethylene oxidation.

Description

technical field [0001] The invention belongs to the field of catalysts, and more specifically, relates to a silver impregnating solution for ethylene epoxidation to produce ethylene oxide, a method for preparing a silver catalyst for ethylene epoxidation to produce ethylene oxide, and a silver catalyst prepared by the method. Silver catalyst, and the application of silver impregnating solution and silver catalyst in ethylene epoxidation to produce ethylene oxide. Background technique [0002] Epoxidation of ethylene under the action of silver catalyst mainly produces ethylene oxide (EO), 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. Activity refers to the reaction temperature required when the ethylene oxide production process reaches a certain reaction load. The lower the reaction temperature, the higher the activity of the catalyst; the selectivi...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J23/68C07D301/10C07D303/04
CPCB01J23/50B01J23/688C07D301/10C07D303/04Y02P20/52
Inventor 韩红苓廉括孙欣欣李金兵代武军汤之强王淑娟任冬梅林强
Owner CHINA PETROLEUM & CHEM CORP
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