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Method for preparing silver catalyst, silver catalyst and application thereof of silver catalyst

A technology of silver catalyst and auxiliary agent, applied in the field of preparation of silver catalyst

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of this invention is to provide a kind of preparation method of the silver catalyst of the silver catalyst that is used for ethylene epoxidation to produce oxirane, to produce the silver catalyst that selectivity and activity are all higher, to solve the problems existing in the prior art question

Method used

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  • Method for preparing silver catalyst, silver catalyst and application thereof of silver catalyst
  • Method for preparing silver catalyst, silver catalyst and application thereof of silver catalyst
  • Method for preparing silver catalyst, silver catalyst and application thereof of silver catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Dissolve 0.034g of methyl rhenium trioxide in 50g of deionized water to prepare an organic rhenium-containing aqueous solution with a rhenium concentration of 500ppm. Take another 15g carrier sample and soak it in the solution prepared above for 30min at room temperature, filter the solution and place the carrier in an oven. Dry at 120°C for 30 minutes to obtain the treated carrier; then dissolve 8.70g of ethylenediamine and 2.94g of ethanolamine in 18.06g of deionized water, and slowly add silver oxalate into the mixture under stirring. The amount of silver oxalate added makes the final preparation Contain silver 26% by weight in the impregnating liquid that obtains, then add the cesium sulfate of 0.068g and be mixed with impregnating liquid soaking the treated carrier, then make silver catalyst finished product after leaching and 300 ℃, thermal decomposition in 3 minutes, its performance As shown in Table 1.

Embodiment 2

[0071] Dissolve 0.034g of methyl rhenium trioxide in 50g of deionized water to prepare an organic rhenium-containing aqueous solution with a rhenium concentration of 500ppm. Another 15g carrier sample is put into a flask and soaked in the above prepared solution for 30min at room temperature, and the solution is filtered off. Dry the carrier in an oven at 80°C for 120 minutes to obtain the treated carrier; then dissolve 8.70g of ethylenediamine and 2.94g of ethanolamine in 18.06g of deionized water, and slowly add silver oxalate to the mixture under stirring. The addition of silver oxalate Quantity makes in the impregnating liquid that finally makes contains silver 18% by weight, then adds the cesium sulfate of 0.068g and is mixed with impregnating liquid and soaks the treated carrier, makes silver catalyst after leaching and 300 ℃, thermal decomposition in 3 minutes The properties of the finished product are shown in Table 1.

Embodiment 3

[0073] Dissolve 0.034g of methyl rhenium trioxide in 50g of deionized water to prepare an organic rhenium-containing aqueous solution with a rhenium concentration of 500ppm. Another 15g carrier sample is put into a flask and soaked in the above prepared solution for 30min at room temperature, and the solution is filtered off. Dry the carrier in an oven at 90°C for 60 minutes to obtain the treated carrier; then dissolve 8.70g of ethylenediamine and 2.94g of ethanolamine in 18.06g of deionized water, and slowly add silver oxalate to the mixture under stirring. The addition of silver oxalate Quantity makes in the impregnating liquid that finally makes contains silver 37% by weight, then adds the cesium sulfate of 0.068g and is mixed with impregnating liquid and soaks the treated carrier, makes silver catalyst after leaching and 300 ℃, 3 minutes thermal decomposition The properties of the finished product are shown in Table 1.

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Abstract

The invention relates to a method for preparing a silver catalyst for producing ethylene oxide by ethylene through epoxidation, and also relates to the silver catalyst prepared by the method and an application of the silver catalyst. The method comprises the following steps: 1) providing a carrier; 2) using an organic rhenium-containing solution for impregnating the carrier, then drying the carrier at the temperature of 80 DEG C to less than 120 DEG C for 30-120 minutes to obtain a first impregnation product; 3) using a silver amine solvent containing an alkali metal-containing auxiliary agent used for impregnating the first impregnation product for 10-60 minutes under condition of a vacuum degree being less than 10mmHg; and 4) performing thermal decomposition on a second impregnation product to obtain the silver catalyst.

Description

technical field [0001] The invention relates to a preparation method of a silver catalyst used for epoxidation of ethylene to produce ethylene oxide, in particular to a preparation method of a high-selectivity silver catalyst and a medium-selectivity silver catalyst. The present invention also relates to the silver catalyst prepared by this method, and its application. Background technique [0002] Silver catalysts are industrially used in the production of ethylene oxide (EO) by the epoxidation of ethylene. Shell, Dow Chemical (UCC), S.D. and China Petroleum & Chemical Corporation have done more research on silver catalysts. In 1931, the first patent of direct oxidation of ethylene to EO was published. It has a history of more than 80 years. After continuous experiments and improvements by researchers from various countries, the selectivity of EO has increased from 70% in the early 1970s to nearly 90% at present. . [0003] There are three different types of silver cataly...

Claims

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Application Information

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IPC IPC(8): B01J23/68C07D303/04C07D301/10
CPCY02P20/52
Inventor 任冬梅李贤丰李金兵孙欣欣薛茜何学勤李秀聪
Owner CHINA PETROLEUM & CHEM CORP
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