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A kind of preparation method of silver catalyst and its application in the production of ethylene oxide by ethylene oxidation

A technology of silver catalyst and silver compound, which is applied in the direction of catalyst activation/preparation, bulk chemical production, chemical instruments and methods, etc., can solve the problems of catalyst silver shedding, catalyst activity, low selectivity, etc., achieve high selectivity, improve active effect

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

S.D company's patents US3207700, US4066575, and US4841080 were first impregnated with silver lactate aqueous solution, and the catalyst activity and selectivity were low; Impregnated with silver amine complex solution, the stability of the catalyst is significantly improved

Method used

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  • A kind of preparation method of silver catalyst and its application in the production of ethylene oxide by ethylene oxidation
  • A kind of preparation method of silver catalyst and its application in the production of ethylene oxide by ethylene oxidation
  • A kind of preparation method of silver catalyst and its application in the production of ethylene oxide by ethylene oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Dissolve 435g of ethylenediamine and 147g of ethanolamine in 750g of deionized water, stir evenly, then add dimethylamine, the molar ratio of silver to dimethylamine is 1:0.06, slowly add silver oxalate into the mixed solution while stirring, and keep the temperature Below 15 ℃, silver oxalate is completely dissolved, and the addition of silver oxalate makes the impregnating liquid that finally makes contains silver 24% (weight). After the silver amine solution is prepared, keep the current temperature, add 300ppm alkali metal (cesium) additives, 500ppm alkaline earth metal (strontium) additives and 800ppm Re additives to prepare an impregnating solution. Take 1250g of the carrier sample and put it into a container, vacuumize it, introduce the impregnating solution to soak the carrier, then leach it, and heat activate it in the air at 300°C for 5 minutes to obtain the finished silver catalyst.

Embodiment 2

[0033] Dissolve 405g of ethylenediamine and 120g of ethanolamine in 730g of deionized water, stir evenly, then add diethylamine, the molar ratio of silver to diethylamine is 1:0.3, slowly add silver oxalate into the mixture while stirring, and keep the temperature Below 15 ℃, silver oxalate is completely dissolved, and the addition of silver oxalate makes the impregnating liquid that finally makes contains silver 24% (weight). After the silver amine solution is prepared, keep the current temperature, add 500ppm of alkali metal (cesium) additives, 200ppm of alkaline earth metal (strontium) additives and 200ppm of Re additives to prepare an impregnating solution. Take 1150g of the carrier sample and put it into a container, vacuumize it, introduce the impregnation solution to soak the carrier, then leach it, and heat activate it in the air at 290°C for 5 minutes to obtain the finished silver catalyst.

Embodiment 3

[0037] Dissolve 430g of ethylenediamine and 132g of ethanolamine in 745g of deionized water, stir evenly, then add dimethylamine and diethylamine, the molar ratio of silver to dimethylamine and diethylamine is 1:0.05, and mix the oxalic acid with stirring Silver is slowly added in the mixed solution, and the temperature is kept below 15° C. to completely dissolve the silver oxalate. The amount of silver oxalate added makes the final impregnating solution contain 24% silver by weight. After the silver amine solution is prepared, keep the current temperature, add 100ppm alkali metal (cesium) additives, 100ppm alkaline earth metal (strontium) additives and 50ppm Re additives to prepare an impregnating solution. Take 1200g of the carrier sample and put it into a container, vacuumize it, introduce the impregnating solution to soak the carrier, then leach it, and heat activate it in the air at 300°C for 5 minutes to obtain the finished silver catalyst.

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Abstract

The invention provides a preparation method of a silver catalyst, and the preparation method comprises the following steps: step A, dissolving ethylenediamine and ethanol in water; step B, under stirring, adding a silver containing compound to the solution, and before, meanwhile and after adding of the silver containing compound, dropping additive dimethylamine and / or diethylamine into the solution; step C, adding assistants containing alkali metals and alkaline earth metals into the silver amine solution to produce a dipping solution; step D, putting an alumina carrier in the dipping solution for dipping; and step E, separating a solid from the dipping solution, and thus obtaining the silver catalyst after thermal activation. In the preparation method, addition of the dimethylamine and the diethylamine can help to improve the activity and stability of the silver catalyst.

Description

technical field [0001] The invention relates to a method for preparing a silver catalyst with high stability and high silver content, and also relates to the application of the silver catalyst in ethylene epoxidation to produce ethylene oxide. Background technique [0002] The industry mainly uses silver catalysts to catalyze the epoxidation of ethylene to produce ethylene oxide (EO). The main performance indicators of silver catalysts include catalyst activity, selectivity and stability. According to the above indicators, the silver catalysts used in the production of ethylene oxide / ethylene glycol (EO / EG) in the world can be divided into three categories: the first category is high-activity silver catalysts, which have high activity and good stability. The initial selectivity is 80-82%, and the service life is 2-5 years. It is suitable for all EO / EG production devices; the second type is medium-selectivity silver catalyst, and the selectivity of this type of catalyst can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/66B01J37/02C07D303/02C07D301/10
CPCY02P20/52
Inventor 李雪莲王辉李贤丰李金兵代武军孙欣欣薛茜李淑云李秀聪何学勤
Owner CHINA PETROLEUM & CHEM CORP
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