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Catalyst for ethylene oxide production, method for producing the same, and method for producing ethylene oxide

A technology for the manufacture of ethylene oxide, applied in catalyst activation/preparation, organic chemical methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as unclear details, and improve catalyst life Effect

Active Publication Date: 2009-02-04
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Regarding the action effect of alkali metals, the following effects have been reported: the effect of existing on the support, neutralizing the acid ionization constant of the support, or the effect of presenting on the surface of Ag to adjust the catalytic action of Ag; but the details are not clear

Method used

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  • Catalyst for ethylene oxide production, method for producing the same, and method for producing ethylene oxide
  • Catalyst for ethylene oxide production, method for producing the same, and method for producing ethylene oxide
  • Catalyst for ethylene oxide production, method for producing the same, and method for producing ethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0071] (1) Determination of the acidity and alkalinity of the carrier:

[0072] For α-alumina support (surface area 1.0m 2 / g, water absorption 35.7% by weight, SiO 2 3.0% by weight, Na 2 O 0.35 wt%, SiO 2 / Na 2 O weight ratio is 9, the shape is the ring of 8mmφ×8mm) carry out the measurement of acidity and alkalinity.

[0073] The use of methyl yellow with a pKa of 3.2 or less does not cause a red color reaction, while the use of methyl red with a pKa of 5.0 or less shows a red color reaction. In addition, the use of bromothymol blue with a pKa of 7.3 or more did not cause a blue color reaction. From the above, it can be seen that the above carrier has an acid ionization constant of 3.2<pKa≤5.0, and does not have an alkali ionization constant of pKa≥7.3.

[0074] (2) Pretreatment of the carrier:

[0075] 100g of the above-mentioned α-alumina carrier was impregnated with 0.156g cesium carbonate (Cs 2 CO 3 ) and 1.69g lithium carbonate (Li 2 CO 3 ) in a 200ml aqueou...

Embodiment 2A～12A

[0082] Examples 2A to 12A and Comparative Examples 1A to 11A

[0083] Carry out pretreatment in the mode of embodiment 1A, difference is: use the carrier with physical properties shown in table 1 and table 2, and change the amount of lithium carbonate and cesium carbonate, make the content of Li and Cs during pretreatment as table 3 and Table 4 shows. Then, prepare the "silver amine complex solution" identical to the composition in Example 1A, but in the "Preparation of Ag Catalyst" in Example 1A, change the concentration of cesium nitrate and ammonium perrhenate to obtain Cs and Catalysts with Re content as shown in Table 3 and Table 4. Also, the Ag content (based on the support) in any of the catalysts was 13.6% by weight. Then, ethylene oxidation reaction was carried out in the same manner as in Example 1A using various catalysts. Table 3 and Table 4 show the catalyst composition and catalyst performance.

[0084]

[0085]

[0086]

[0087]

[0088] It can b...

Embodiment 1B

[0095] (1) Pretreatment of the carrier

[0096] Carry out by the operation similar to embodiment 1A, difference is: use surface area 1.4m 2 / g, water absorption 41.6% by weight, SiO 2 2.8% by weight, Na 2 O 0.25 wt%, SiO 2 / Na 2 The ring-shaped α-alumina carrier with O weight ratio of 11 and shape of 8mmφ×8mm was changed, and the amount of lithium carbonate and cesium carbonate was changed so that the contents of Li and Cs during pretreatment were as shown in Table 6, thereby preparing the impregnated Carrier for Li and Cs components. The Li content in the support was 600 ppm, and the Cs content was 340 ppm. Table 5 shows the physical properties of the carriers used.

[0097] (2) Preparation of silver amine complex solution:

[0098] The same operation as in Example 1A was carried out to prepare a silver amine complex solution.

[0099] (3) Preparation of Ag catalyst:

[0100]The same operation as in Example 1A was carried out to obtain a catalyst. The contents of A...

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Abstract

Disclosed is a catalyst for ethylene oxide production which is used for producing ethylene oxide from ethylene. This catalyst is composed of at least silver (Ag), caesium (Cs), rhenium (Re) and a carrier, and improved especially in selectivity. Specifically disclosed is a catalyst for ethylene oxide production, which is used for producing ethylene oxide from ethylene and composed of at least silver (Ag), caesium (Cs), rhenium (Re) and a carrier. If necessary, an alkali metal is loaded onto the carrier as a pretreatment, and then Ag, Cs and Re are loaded onto the carrier, thereby obtaining the catalyst. The carrier has a specific surface area of 0.6-3.0 m2 / g, and a weight ratio between the silicon (Si) content and the sodium (Na) content in terms of SiO2 / Na2O of 2-50. The Re content (based on the carrier) is 170-600 ppm per 1 m2 / g of the specific surface area of the carrier, and the molar ratio Cs / Re is 0.3-19.

Description

technical field [0001] The present invention relates to a catalyst for producing ethylene oxide, a method for producing the same, and a method for producing ethylene oxide. Background technique [0002] The main component of the catalyst for producing ethylene oxide from ethylene is silver (Ag), which is supported on a carrier. Industrially, elements such as alkali metals and rhenium (Re) are added to Ag as a main component of a catalyst as co-catalysts to improve catalyst performance (Patent Document 1). [0003] Regarding the action effect of the alkali metal, the effect of existing on the support to neutralize the ionization constant of the acid of the support, or the effect of adjusting the catalytic action of Ag by being present on the surface of Ag has been reported; however, the details are unclear. On the other hand, regarding Re, its existence site in the catalyst and its mechanism of action as a co-catalyst are not yet clear, but it must coexist with an alkali met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J35/10B01J37/02C07D301/10C07B61/00
CPCY02P20/52
Inventor 仲代克己山田聪一郎松本隆直
Owner MITSUBISHI RAYON CO LTD
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