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Carrier of silver catalyst for producing ethylene oxide, preparation method thereof, silver catalyst prepared by using same and application thereof in producing ethylene oxide

A technology of silver catalyst and ethylene oxide, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc., can solve unmentioned problems

Active Publication Date: 2010-10-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent JP2002136868 does not mention the effect of low-concentration hydrofluoric acid treatment followed by low-temperature roasting treatment below 1000°C

Method used

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  • Carrier of silver catalyst for producing ethylene oxide, preparation method thereof, silver catalyst prepared by using same and application thereof in producing ethylene oxide
  • Carrier of silver catalyst for producing ethylene oxide, preparation method thereof, silver catalyst prepared by using same and application thereof in producing ethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 and 1-2

[0082] Using the same impregnating solution in the above comparative example 1, get each 30g of the carrier A1 and A2 of the present invention, respectively place them in a vacuumable container, vacuumize to more than 10mmHg, put into about 60g of the above silver-containing impregnating solution respectively, and immerse the carrier , kept for 30 minutes, leached to remove excess solution, then heated in 300° C. air flow for 5 minutes, and cooled to prepare silver catalysts 1-1 and 1-2 of the present invention.

[0083] Under the reaction conditions that the concentration of ethylene oxide at the outlet of the reactor as described above is 2.5% (molar concentration), catalysts 1-1, 1-2 of the present invention and comparative catalyst 1 are compared and evaluated simultaneously, and the obtained results are shown in the following table 2 .

[0084] Table 2

[0085] sample

[0086] sample

[0087] The above Table 2 shows that the catalysts 1-1 and 1-2 of t...

Embodiment 2

[0092] Get 30g of the carrier B1 of the present invention, place it in a vacuumable container, vacuumize it to more than 10mmHg, put about 60g of the impregnating solution in Comparative Example 2, immerse the carrier, keep it for 30 minutes, remove excess solution by leaching, and then The silver catalyst 2 of the present invention was prepared by heating in an air stream at 300° C. for 5 minutes and cooling.

[0093] The above comparison silver catalyst 2 and the silver catalyst 2 of the present invention were compared and evaluated under the reaction conditions that the concentration of ethylene oxide at the outlet of the reactor was 2.5% (molar concentration) as described above, and the results are shown in Table 3 below.

[0094] table 3

[0095] sample

[0096] sample

Embodiment 3

[0101] Using the same impregnating solution in the above comparative example 3, get the carrier C1 30g of the present invention, place it in a container that can be vacuumed, and evacuate it to more than 10mmHg, put into about 60g of the silver-containing solution described in the comparative example 3, and immerse the carrier , kept for 30 minutes, leached to remove excess solution, then heated in air flow at 300° C. for 5 minutes, and cooled to prepare the silver catalyst 3 of the present invention.

[0102] The above comparison silver catalyst 3 and the silver catalyst 3 of the present invention were compared and evaluated under the reaction conditions that the concentration of ethylene oxide at the outlet of the reactor was 2.5% (molar concentration) as described above, and the results are shown in Table 4 below.

[0103] Table 4

[0104] sample

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PUM

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Abstract

The invention relates to an aluminum oxide carrier for catalyzing ethylene to have epoxidation in gas and solid phases to produce ethylene oxide (EO), a preparation method thereof, a silver catalyst prepared by using the preparation method and application thereof in producing the EO. The silver catalyst contains an effective catalytic quantity of silver, one or more optional alkali metal mixtures, optional alkaline-earth metals or a mixture thereof, an optional rhenium aid and an alpha-aluminum oxide carrier treated through hydrofluoric acid. When the carrier and the obtained silver catalyst are used for the epoxidation of the ethylene for preparing the EO, the carrier and the obtained silver catalyst have higher activity and selectivity and long-term stability.

Description

technical field [0001] The invention relates to an alumina carrier of a silver catalyst used for gas-solid phase catalytic oxidation of ethylene to produce ethylene oxide, a preparation method thereof, a silver catalyst prepared therefrom and its application in the production of ethylene oxide. technical background [0002] The direct oxidation of ethylene and oxygen to ethylene oxide on metallic silver is an important catalytic reaction process. The silver catalyst used can be simple metallic silver or a supported silver catalyst. At present, the silver catalysts used in industry are all silver catalysts supported on alumina. In order to further improve the effective utilization rate of metallic silver, improve the activity, selectivity and stability of the catalyst, and improve the economics of production, various research and development companies are constantly making unremitting efforts in the aspects of carrier, auxiliary agent system, preparation process and reaction...

Claims

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Application Information

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IPC IPC(8): B01J21/04B01J23/50B01J23/68B01J23/66C07D301/10C07D303/04
CPCY02P20/52
Inventor 蒋军李金兵陈建设张志祥李淑云王淑娟
Owner CHINA PETROLEUM & CHEM CORP
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