Silver catalyst for high selectivity oxidation of ethylene to prepare ethylene oxide, and use method thereof

A technology for silver ethylene oxide and ethylene oxidation, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of slow deactivation, decreased selectivity, Reduce catalyst stability and other problems to achieve the effect of prolonging life, improving selectivity, and stabilizing catalyst selectivity

Active Publication Date: 2016-01-13
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at Ag / Al currently used for ethylene epoxidation to ethylene oxide 2 o 3 The catalyst has the disadvantages of reduced catalyst stability and selectivity as the reaction progresses during use. The invention discloses an Ag / Al 2 o 3 Catalyst preparation and its use method, using the catalyst and the method involved in the present invention, the reaction of ethylene oxide to ethylene oxide has the advantages of high selectivity, good stability, slow deactivation, etc.

Method used

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  • Silver catalyst for high selectivity oxidation of ethylene to prepare ethylene oxide, and use method thereof
  • Silver catalyst for high selectivity oxidation of ethylene to prepare ethylene oxide, and use method thereof

Examples

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Effect test

Embodiment 1

[0030] Carrier Al 2 o 3 preparation. Mix a certain amount of alumina trihydrate:alumina monohydrate mixed powder with a ratio of 2:1 and graphite powder accounting for 10% of the mass fraction of the mixed powder, and then add calcium carbonate with a mass fraction of 5% and a mass concentration of Mix and knead with 10% dilute nitric acid for 30 minutes, and finally shape it on a molding machine. After drying the molded carrier at room temperature for 8 hours, then dry it at 120°C for 4 hours. The dried carrier is finally placed in a muffle furnace Calcined at 1400° C. for 6 hours to obtain the final carrier A with a water absorption rate of 101.2%.

[0031] Weigh 23.0g of silver nitrate, dissolve 10.1g of ammonium oxalate in 112.0g of deionized water heated to 40-60°C to make an ammonium oxalate solution, slowly dissolve the weighed silver nitrate in the ammonium oxalate solution, and produce white silver oxalate precipitate . Filter the precipitate and dissolve it in a ...

Embodiment 2

[0037] Carrier Al 2 o 3 preparation. Mix a certain amount of alumina trihydrate:alumina monohydrate mixed powder at a ratio of 5:1 and graphite powder with a mass fraction of 15% of the mixed powder, and then add calcium carbonate with a mass concentration of 3% and a mass concentration of Mix and knead 20% dilute nitric acid for 30 minutes, and finally shape it on a molding machine. The molded carrier is dried at room temperature for 8 hours, and then dried at 120°C for 4 hours. The dried carrier is finally muffled at 1300°C. Calcined in the furnace for 12 hours, the final carrier B was obtained, and its water absorption rate was 89.1%.

[0038] Weigh 30.0g of silver nitrate, dissolve 15.3g of ammonium oxalate in 142.0g of deionized water heated to 40-60°C to make an ammonium oxalate solution, slowly dissolve the weighed silver nitrate in the ammonium oxalate solution, and produce white silver oxalate precipitate . Filter the precipitate and dissolve it in a mixed solutio...

Embodiment 3

[0043] Carrier Al 2 o 3 preparation. Mix a certain amount of alumina trihydrate:alumina monohydrate mixed powder with a ratio of 3:1 and graphite powder accounting for 6% mass fraction of the mixed powder, and then add calcium carbonate with a mass concentration of 8% and a mass concentration of Knead with 15% dilute nitric acid for 30 minutes, and finally shape it on a molding machine. After drying the molded carrier at room temperature for 8 hours, then dry it at 120°C for 4 hours. The dried carrier is finally placed in a muffle furnace Calcined at 1500° C. for 6 hours to obtain the final carrier C with a water absorption rate of 98.6%.

[0044] Weigh 17.0g of silver nitrate, dissolve 8.6g of ammonium oxalate in 100.0g of deionized water heated to 40-60°C to make an ammonium oxalate solution, slowly dissolve the weighed silver nitrate in the ammonium oxalate solution, and produce white silver oxalate precipitate . Filter the precipitate and dissolve it in a mixed solutio...

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Abstract

The invention discloses a silver catalyst for high selectivity oxidation of ethylene to prepare ethylene oxide. The silver catalyst is composed of a main active component, an assistant and a carrier, wherein the main active component is silver, and the content is 1-30wt%; the assistant is one or more of Na, Cs, Ce, Re and Zr, and the content of the oxide of the assistant is 0.001-10wt%; and the sum of the content of above three components is 100%. The specific surface area of the catalyst is 1-10m<2>/g, and the pore volume of the catalyst is 0.1-1ml/g. The invention also provides a method for improving the stability of the catalyst in oxidation of ethylene to prepare ethylene oxide. The method is characterized in that an adjustment gas for promoting the activity stability of the catalyst is introduced to a reaction system with reaction raw materials in the reaction process; and the adjustment gas is formed by an adjustment component and a dilution component, the adjustment component is a gas of one or more of sulfur, phosphorus and VII A family elements, and the dilution gas is one or more of water vapor, air, nitrogen, methane and ethane. The method can improve the stability of the catalyst, reduces catalyst inactivation and prolongs the life of the catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a silver catalyst for preparing ethylene oxide by ethylene oxidation and a preparation method thereof, in particular to a method for improving the activity and stability of the catalyst for preparing ethylene oxide by ethylene oxidation. Background technique [0002] The partial oxidation of ethylene to ethylene oxide is one of the most important processes in the modern chemical industry. In 2007, the total consumption of ethylene oxide in the world was about 18.981 million tons, and the total consumption in 2012 reached about 24.80 million tons. [0003] At present, there are more than 100 sets of EO / EG production units in the world. Due to the increasing demand of the downstream polyester industry, after experiencing a wave of equipment construction and expansion, the total production capacity of ethylene oxide in the world in 2007 reached 19.25 million t / a. By 2010, the world's ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C07D303/04C07D301/10
CPCY02P20/52
Inventor 孙彦民郭宝林吴同旭杨玉旺蔡奇张雪梅于海斌
Owner CHINA NAT OFFSHORE OIL CORP
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