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Method for producing ethylene oxide

A technology of ethylene oxide and nitric oxide, used in products, organic chemistry, reagents, etc.

Active Publication Date: 2016-02-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although currently designed silver catalysts have been sufficiently improved to exhibit high selectivity, there is still a need to develop silver catalysts with better performance

Method used

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  • Method for producing ethylene oxide

Examples

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preparation example Construction

[0025] Preparation of Catalyst A: Add 28 parts of ethylenediamine, 10 parts of ethanolamine and 46 parts of deionized water into a stirred glass flask. While stirring, slowly add 62 parts of silver oxalate with a silver content of 62.6wt% into the mixed solution, keep the solution temperature at 0-15°C, and form a silver amine solution after all the silver oxalate is dissolved, then add 0.10 parts of cesium hydroxide, 0.02 Potassium hydroxide, 0.01 part of ammonium sulfate. Take 10g of the carrier and put it in a vacuumable container, evacuate it to below 10mmHg, immerse the carrier in the silver amine solution configured above for 30 minutes, leach off the excess solution, and then heat it in the air flow at 300°C for 5 minutes. Catalyst A was prepared after cooling.

[0026] Preparation of Catalyst B: Add 28 parts of ethylenediamine, 10 parts of ethanolamine and 46 parts of deionized water into a stirred glass flask. While stirring, slowly add 62 parts of silver oxalate wi...

Embodiment 1～6

[0033] Feed gas mixture composition: Ethylene (C 2 h 4 ), 30.0±2.5mol%; oxygen (O 2 ), 7.2±0.5mol%; carbon dioxide (CO 2 ), 2 ),margin. The reaction pressure is 1.8MPa; the space velocity is 5000h -1 ; The concentration of ethylene oxide (EO) in the reactor outlet tail gas is 2.5%. Catalysts A-F were selected for micro-reaction evaluation, corresponding to Examples 1-6, and the results are shown in Table 1.

Embodiment 7

[0037] Feed gas mixture composition: Ethylene (C 2 h 4 ), 30.0±2.5mol%; oxygen (O 2 ), 7.2±0.5mol%; carbon dioxide (CO 2 ), 2 ),margin. The reaction pressure is 1.8MPa; the space velocity is 5000h -1 ; The concentration of ethylene oxide (EO) in the reactor outlet tail gas is 2.5%. Catalyst D was selected for micro-reaction evaluation, and the results are shown in Table 1.

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Abstract

The invention provides a method for producing ethylene oxide. The method comprises the following steps that charging gas mixture is reacted under existence of a silver catalyst to generate a reaction product containing ethylene oxide; wherein, the charging gas mixture contains ethane, oxygen and a mixing nitrogen oxide, the mixing nitrogen oxide contains two or more components from nitric oxide, nitrogen dioxide and nitrous oxide; and the content of rhenium element in the silver catalyst is equal to or smaller than 100 ppm. The invention provides the novel industrial method for producing ethylene oxide by using the silver catalyst containing rhenium with low rhenium content or containing no rhenium.

Description

technical field [0001] The invention provides a method for preparing ethylene oxide. Background technique [0002] The preparation of ethylene oxide by the gas-phase catalytic oxidation of ethylene with a molecular oxygen-containing gas in the presence of a silver catalyst is widely practiced on a commercial scale. Usually the concentration of ethylene in the feed can be selected within a wide range. In general, the ethylene concentration is at most 80 mol%, relative to the total feedstock, generally ranging between 0.5-70 mol%, especially between 1-60 mol%. In theory, the concentration of oxygen in the raw material can be selected within a wide range; but in practice, the concentration of oxygen used should be lower than the explosion limit concentration; generally speaking, the concentration of oxygen used is 1-15mol% of the total raw material, More preferably in the range of 2-12 mol%. In order to keep the concentration beyond the explosive limit, the concentration of ...

Claims

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Application Information

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IPC IPC(8): C07D301/10C07D303/04
CPCY02P20/141
Inventor 孙欣欣任冬梅李秀聪王辉李贤丰林强汤之强崔宝林林伟
Owner CHINA PETROLEUM & CHEM CORP
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