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Alumina supporter for silver catalyst and silver catalyst

A technology of alumina carrier and silver catalyst, applied in catalyst carrier, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of long gas catalyst path, high energy consumption for device operation, bed To solve problems such as layer pressure drop, achieve good mass transfer and heat transfer effect, optimize flow state, and reduce mass transfer resistance.

Inactive Publication Date: 2012-09-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the alumina carrier of the above shape can meet the needs of industrial production, the oxidation of ethylene to ethylene oxide is a strong oxidation exothermic reaction. The alumina carrier of the above shape has the following disadvantages: the high pressure drop of the bed layer leads to the operation of the device. High consumption; the path of gas passing through the inside of the catalyst is long, which is not conducive to mass transfer and heat transfer

Method used

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  • Alumina supporter for silver catalyst and silver catalyst
  • Alumina supporter for silver catalyst and silver catalyst
  • Alumina supporter for silver catalyst and silver catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 60 ~ 400 mesh α-trihydrate Al 2 o 3 2280g and greater than 180 mesh false monohydrate Al 2 o 3 680g is put into the mixer, after mixing evenly, transfer to the kneader, add 550 milliliters of dilute nitric acid, knead into a paste that can be extruded, and then put it into the molding machine. The mold is replaced with a three-hole carrier 10 mold with three leaflets on the outer periphery, extruded into a three-hole column with an outer diameter of 8.0mm, a length of 7.0mm, and an inner diameter of 2.0mm, and dried at 90-110°C for 1 For more than an hour, the free water content is reduced to below 10%. Then put the green body into the electric furnace, raise it from room temperature to 1250 ℃ ~ 1350 ℃ after about 25 hours, and keep the temperature for 1.5 hours to obtain white α-Al 2 o 3 Carrier samples. See Table 3 for the data.

Embodiment 2

[0052] Same as Example 1, the difference is that the mold is replaced with a four-hole carrier 20 mold with four leaflets on the outer periphery, and extruded into a single-hole column with an outer diameter of 8.0 mm, a length of 7.0 mm, and an inner diameter of 1.6 mm. Carrier data are shown in Table 3.

Embodiment 3

[0054] Same as Example 1, the difference is that the mold is replaced with a five-hole carrier 30 mold with five leaflets on the outer periphery, and extruded into a five-hole column with an outer diameter of 8.0 mm, a length of 7.0 mm, and an inner diameter of 1.2 mm. Carrier data are shown in Table 3.

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Abstract

The invention discloses an alumina supporter for a silver catalyst. The alumina supporter comprises a cylindrical basal body with a central passage, and at least three partially cylindrical valve leaflets separated at equal intervals, wherein the valve leaflets are integrally connected on the periphery of the basal body. The alumina supporter with a new shape has high surface area and porosity between the supporters, can effectively reduce the pressure drop of a catalyst bed of the reactor, optimize the flow condition in the catalyst layer, achieve better mass and heat transferring effect and improve the performance of the silver catalyst. The silver catalyst prepared by utilizing the alumina supporter has stable performance and higher activity and selectivity, and is particularly suitable for the reaction for producing ethylene oxide by ethylene oxidization.

Description

technical field [0001] The invention relates to an alumina carrier and a silver catalyst. Specifically, the present invention relates to an alumina support and a silver catalyst for a silver catalyst used in the epoxidation of olefins. The present invention also relates to a process for the epoxidation of olefins using said silver catalyst. Background technique [0002] Under the action of silver catalyst, ethylene epoxidation mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water, among which selectivity, stability and activity are the main performance indicators of silver catalyst. The so-called selectivity refers to the ratio of the moles of ethylene converted into ethylene oxide in the reaction to the total reaction moles of ethylene. The so-called stability is expressed as the decline rate of activity and selectivity, the smaller the decline rate, the better the stability of the catalyst. The so-called activity refers to...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J23/50C07D301/10
CPCY02P20/52
Inventor 蒋文贞孙雪莲李金兵陈建设张志祥蒋军代武军崔宝林
Owner CHINA PETROLEUM & CHEM CORP
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