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A kind of silver catalyst for oxidizing ethylene oxide to ethylene oxide and its preparation method and application

A silver catalyst, ethylene oxide technology, applied in the petrochemical field, can solve the problems of reducing activity and increasing reaction temperature, and achieves the effects of cost saving, uniform distribution and high yield

Active Publication Date: 2022-03-22
REZEL CATALYSTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the experimental results of JP4363139 showed that compared with the catalyst without additives, the addition of Sn salt only increased the selectivity of the catalyst by 0.8, but significantly reduced the activity, and increased the reaction temperature by 7°C.

Method used

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  • A kind of silver catalyst for oxidizing ethylene oxide to ethylene oxide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Add sodium aluminate solution dropwise continuously in a 1-liter stirring tank, the mass fraction of aluminum oxide is 10%, and the aluminum sulfate solution is 10% of mass fraction based on alumina to neutralize and gel, and control the flow to make the pH value of the colloid 8.5 Under the condition of ~9.5, the colloid is washed and dried to obtain the dry rubber powder of the aluminum hydroxide precursor of the high-porosity alumina.

[0072] Get 1000 grams of high pore volume aluminum hydroxide dry rubber powder obtained by the above-mentioned preparation steps, and 150 grams of α-silicon carbide powder, 150 grams of microcrystalline cellulose with an average particle diameter of 0.8 to 1.2 microns, 200 grams of petroleum coke, 20 grams of Magnesium nitrate, 17 grams of ammonium fluoride, and raw material powder are first sieved through 200 meshes, mixed with 1000 grams of aluminum hydroxychloride solution, and a predetermined amount of cesium nitrate, stannous chlo...

Embodiment 2

[0094] Get 1000 grams of the high pore volume aluminum hydroxide dry rubber powder that embodiment 1 makes, and 250 grams of α-silicon carbide powder, 200 grams of microcrystalline cellulose with an average size of 0.8 to 1.2 microns, 250 grams of carbon powder, and raw material powder through the 200 mesh sieve, mixed with 1000 grams of aluminum hydroxychloride solution, 16 grams of ammonium fluoride, 25 grams of magnesium nitrate and a predetermined amount of lanthanum nitrate.

[0095] Add a predetermined amount of cesium nitrate, stannous chloride, boric acid and ammonium phosphate solution into the nitric acid solution, mix evenly, add to the aforementioned composition powder, knead and peptize, and prepare a hollow cylindrical composite carrier by molding The precursor green body; the precursor green body was dried and calcined at 1450°C for 5 hours to make a composite carrier.

[0096] Silver solution was prepared according to the same steps as in Example 1, and the silve...

Embodiment 3

[0100] Get 1000 grams of high pore volume aluminum hydroxide dry rubber powder prepared in Example 1, and 200 grams of α-silicon carbide powder, 100 grams of microcrystalline cellulose with an average size of 0.8 to 1.2 microns, 250 grams of graphite powder, and raw material powder through the 200 mesh sieve, mixed with 800 grams of aluminum hydroxychloride solution, 18 grams of ammonium fluoride and a predetermined amount of cerium-rich mixed rare earth, magnesium chloride.

[0101] Add a predetermined amount of cesium nitrate, stannous chloride, boric acid and phosphoric acid solution into the nitric acid solution, mix evenly, add to the aforementioned composition powder, knead and peptize, and prepare a hollow cylindrical composite carrier by molding Precursor green body; after the precursor green body is dried, it is calcined at 1470° C. for 3 hours to make a composite carrier.

[0102] According to the same steps as in Example 1, the silver solution was formulated, follow...

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Abstract

A silver catalyst for oxidizing ethylene oxide to ethylene oxide and its preparation method and application, belonging to the field of petrochemical technology, the silver catalyst is composed of α-silicon carbide and α-alumina on a composite carrier, containing silver catalyst dry base The mass percent based on mass is 10-20% silver, 0.001-1% IA group element, 0.1-10% IIA group element, 0.1-10% VIIA group element, 0.01-1% rare earth element, 0.1-1% of high-valence metal modifying elements and 0.1-5% of non-metallic modifying elements; the porosity of the silver catalyst is 45%-75%, the specific surface area is 0.1-2 square meters per gram, and the pore volume is 0.4-1.0 ml / gram. The silver catalyst has good conduction, diffusion and reaction properties, uniform distribution of metal active components, and high selectivity, activity and stability in the oxidation reaction process.

Description

technical field [0001] The present invention relates to a kind of silver catalyst and preparation method thereof, more specifically the present invention relates to a kind of silver catalyst and preparation method thereof for producing ethylene oxide by ethylene oxidation, also relate to this silver catalyst in ethylene oxidation production cycle The application in oxyethane belongs to the technical field of petrochemical industry. Background technique [0002] Olefin gas-phase oxidation can produce many useful organic compounds, among which the epoxidation of ethylene to ethylene oxide is more important. Ethylene oxide is an important organic chemical product second only to polyethylene and polyvinyl chloride in the industrial derivatives of ethylene. It is mainly used to produce Ethylene glycol, which is the main raw material for making polyester resin, is also used in large quantities as an antifreeze agent. Now almost all ethylene oxide is combined with ethylene glycol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/228B01J23/50B01J32/00B01J21/04B01J37/02B01J37/08B01J35/10C07D301/10C07D303/04
CPCB01J27/228B01J23/50B01J21/04B01J37/0205B01J37/082C07D301/10C07D303/04B01J35/61Y02P20/52
Inventor 卓润生刘新生王洪飞
Owner REZEL CATALYSTS CO LTD
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