Method for preparing vinyl epoxide argentum catalyst

A catalyst and silver oxide technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of insufficient reactivity of silver catalysts, achieve activity improvement, High reactivity, high selectivity effect

Inactive Publication Date: 2004-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defect that the silver catalysts prepared in the existing literature are not sufficiently reactive, and provide a method for preparing silver catalysts for ethylene epoxidation. The catalyst prepared by the method is used for ethylene epoxidation reactions The production of ethylene oxide has the advantages of low reaction temperature and high reactivity, while maintaining high selectivity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of carrier A:

[0032] Take 500 grams of alumina monohydrate powder and place it in a kneader, add 125 grams of graphite, 3 grams of calcium silicate, and 160 grams of water, fully knead, and extrude into an outer diameter of 8 mm, an inner diameter of 4 mm, and a height of 6.4 mm. Raschig ring. Drying at 120°C and calcining at 1500°C for 4 hours to obtain a Raschig cyclic α-alumina carrier.

[0033] Take 100 g of α-alumina carrier, add potassium hydroxide aqueous solution (0.05 g potassium hydroxide is dissolved in 100 ml water), and treat at 300° C. for 10 hours. After cooling, the carrier was repeatedly washed with deionized water until the effluent was neutral, and dried at 120°C.

[0034] 2. Preparation of catalyst A:

[0035] Weigh 59.1 grams of silver nitrate and dissolve it in 200 milliliters of water. Another 26.8 grams of ammonium oxalate was dissolved in 364 milliliters of water. The above two solutions were subjected to precipitation reac...

Embodiment 2

[0051] 1. Preparation of carrier B:

[0052] Take 100 g of the α-alumina carrier of Example 1, add an aqueous solution of sodium carbonate (50 g of sodium carbonate dissolved in 500 ml of water), and treat at 300° C. for 10 hours. Cool, wash the carrier repeatedly with deionized water until the effluent is neutral, and dry.

[0053] 2. Prepare Catalyst B:

[0054] Prepare catalyst B by the method for embodiment 1, difference is to replace carrier A with carrier B, changes the consumption of silver and cesium in the catalyst, the catalyst B that makes contains 20% silver by weight, the cesium of 250ppm.

Embodiment 3

[0056] 1. Preparation of carrier C:

[0057] Take 900 grams of alumina monohydrate powder and place it in a kneader, add 225 grams of graphite, 4.5 grams of calcium silicate, 0.5 grams of ammonium fluoride, and 290 grams of water. 4mm, 6.4mm high Raschig ring. Drying at 120°C and calcining at 1400°C for 4 hours to obtain a Raschig cyclic α-alumina carrier.

[0058] Take 100 grams of α-alumina carrier, add cesium hydroxide ethanol solution (10 grams of cesium hydroxide is dissolved in 500 ml of ethanol), treat at 500 ° C for 2 hours, cool, and wash the carrier repeatedly with deionized water until the effluent is Neutral, dry at 120°C.

[0059] 2. Preparation of catalyst C:

[0060]Dissolve 59.1 grams of silver nitrate in 200 milliliters of water. Another 26.8 grams of ammonium oxalate was dissolved in 364 milliliters of water. The above two solutions were subjected to precipitation reaction at 40° C., and the obtained silver oxalate precipitate was washed with deionized w...

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Abstract

A process for preparing silver catalyst used for epoxidizing ethylene includes such steps as treating alpha-alumina as carrier by the solution or gas of alkaline substance, washnig with water until it becomes neutral, drying to obtain carrier, and carrying silver and assistant chosen from S, Re, Mo, W, Ni, alkali metal, and alkali-earth metal. Its advantages are low reaction temp and high activity and selectivity.

Description

technical field [0001] The invention relates to a preparation method for ethylene epoxidation silver catalyst. Background technique [0002] The use of silver catalysts in ethylene epoxidation to produce ethylene oxide has been widely implemented in industrial installations. High activity and high selectivity are two important properties of silver catalysts, and the carrier performance is crucial to the activity and selectivity of silver catalysts. role. Silver catalysts are usually prepared with α-alumina as the carrier, silver as the main active component, and a small amount of co-catalyst added. In order to obtain a highly active catalyst, it is necessary to provide a high specific surface of silver particles, requiring the carrier to have a large enough specific surface, but if the specific surface is too large, it will make it difficult to remove the heat from the reaction system, aggravate the deep oxidation of the reaction, and reduce the select...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J37/08C07D301/10
Inventor 卢立义顾国耀程远琳翁漪
Owner CHINA PETROLEUM & CHEM CORP
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