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Alpha-alumina support for silver catalyst for olefin epoxidation and preparation method thereof

A technology of alumina carrier and silver catalyst, which is applied in the direction of catalyst carrier, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low selectivity and achieve the effect of selectivity improvement

Active Publication Date: 2017-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the selectivity of the silver catalyst made from the carrier obtained by using the above patents is generally low, which has a negative impact on the economics of ethylene oxide and ethylene glycol production, and still needs to be carried out on the formulation and manufacturing technology of the carrier. Improvement to increase the selectivity of the catalyst, reduce the consumption of raw material ethylene for the production of ethylene oxide and ethylene glycol, reduce the production cost and improve the competitiveness of the product

Method used

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  • Alpha-alumina support for silver catalyst for olefin epoxidation and preparation method thereof
  • Alpha-alumina support for silver catalyst for olefin epoxidation and preparation method thereof
  • Alpha-alumina support for silver catalyst for olefin epoxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] a) Preparation of carrier

[0056] 50-500 mesh, α-trihydrate Al 2 o 3 338 g of pseudo-Al monohydrate larger than 200 mesh with a silicon content of 780 ppm (by mass of silica) and a magnesium content of 32 ppm (by mass) 2 o 3 145g, petroleum coke 0g, 2g finely ground barium sulfate, NH 4 Put F7g into a mixer and mix evenly, transfer it to a kneader, add 0.12 liters of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and knead it into a paste that can be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free moisture content to below 10%.

[0057] Put the above-mentioned five-hole column into a bell kiln, raise it from room temperature to 1350°C in about 30 hours, and keep the temperature constant for 6 hours to obtain white α-Al 2 o 3 Carrier samples. The performance data of the tested carriers are shown in Table 1.

...

Embodiment 2

[0069] With embodiment 1, difference is to add the petroleum coke of 41g. The data of the prepared carrier is shown in Table 1; the data of the silver catalyst prepared using the carrier of this embodiment and its catalytic performance data are shown in Table 2.

Embodiment 3

[0071] The same as in Example 1, the difference is: the use of α-trihydrate Al with a silicon content of 890ppm (by mass) and a magnesium content of 18ppm (by mass) 2 o 3 212 g of pseudo-Al monohydrate with a silicon content of 1720 ppm (by mass of silica) and a magnesium content of 23 ppm (by mass) 2 o 3 192g and add Vaseline 10g, NH 4 F7g, 2g of finely ground barium sulfate; the five-hole column was kept at a constant temperature for 12h between room temperature and 1200°C; when preparing the impregnating solution, add 2.2g of cesium sulfate, 1.4g of strontium acetate and 0.6g of perrhenic acid instead of adding 2.2g cesium sulfate, 2.6g barium acetate, 0.3g lithium sulfate and 0.9g perrhenic acid; the impregnated carrier was heated at 220°C. The data of the prepared carrier is shown in Table 1; the data and catalytic performance data of the silver catalyst prepared using the carrier of this embodiment are shown in Table 2.

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Abstract

The invention provides an alpha-aluminum oxide supporter for a silver catalyst for olefin epoxidation. The mass content of a silicon compound in the supporter is counted as 10-2400ppm by use of silicon dioxide, and the mass content of a magnesium compound is counted as 10-100ppm by use of magnesium. The invention also provides a preparation method of the alpha-aluminum oxide supporter. The preparation method comprises the steps of mixing a solid mixture of aluminum source containing 10-2000ppm of silicon dioxide and 8-80pm of magnesium, a fluoride mineralizer and a heavy alkaline earth metal compound, a binder and water, kneading, shaping, drying and roasting to obtain the supporter. The supporter is subjected to impregnation of active components (silver and assistants), and then is prepared into a rhenium and silver containing catalyst, and when the rhenium and silver containing catalyst is used for olefin epoxidation, and particularly, the catalyst is used for producing ethylene oxide through ethylene epoxidation, the selectivity of the catalyst is improved remarkably.

Description

technical field [0001] The invention relates to a catalyst carrier and catalyst for olefins. More specifically, the present invention relates to a silver catalyst carrier and catalyst for olefin epoxidation. The present invention also relates to the preparation and application of the silver catalyst carrier and the silver catalyst. Background technique [0002] Alkenes can be directly oxidized to the corresponding olefin oxides by using molecular oxygen as the oxidizing agent. The catalyst used for this oxidation reaction contains silver as catalytically active metal deposited on a support. Most of these catalysts comprise a porous inert support, such as alpha-alumina, with silver and other components deposited on the support. [0003] Under the action of silver catalyst, the oxidation of ethylene mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water. Among them, activity, selectivity and stability are the main performance i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/68C07D301/10C07D303/04
CPCY02P20/52
Inventor 陈建设王辉齐海英任冬梅代武军孙欣欣张志祥李金兵
Owner CHINA PETROLEUM & CHEM CORP
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