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
CN103418380BActive Publication Date: 2015-11-25CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2015-11-25

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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.
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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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