Olefin epoxidation catalyst preparation method, catalyst and application

A catalyst, epoxidation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the modification and improvement of the morphology and structure of nano-silver particles limited effect, catalyst activity and selectivity improvement limitations, etc., to achieve the effect of improving morphology and structure, and improving selectivity and activity

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned traditional industrial preparation of silver catalysts by impregnation and activation has limited modification and improvement effects on the morphology and structure of silver nanoparticles formed on the surface of the carrier, so the improvement of the activity and selectivity of the catalyst is limited to a certain extent.

Method used

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  • Olefin epoxidation catalyst preparation method, catalyst and application
  • Olefin epoxidation catalyst preparation method, catalyst and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of silver catalyst carrier A:

[0048] Mix 50-500 mesh trishui A1 2 o 3 400g, fake monohydrate A1 through 200 mesh sieve 2 o 3 200g, mineralizer 10g, barium salt 3g, put into the mixer and mix evenly, transfer to the kneader, add 120 milliliters of 20wt% nitric acid aqueous solution, knead into a paste that can be extruded. Extrude into a single-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry at 80-120°C for 2 hours to reduce the free water content to below 10% by weight to obtain a green body. Then put the green body into an electric furnace, raise it from room temperature to 1300°C, and keep the temperature at this high temperature for 2 hours to obtain white α-A1 2 o 3 A sample, referred to as Support A, was used as the silver catalyst support of the present invention. The crushing strength of the above-mentioned carrier is 75N, the water absorption rate is 55%, the specific surface area is 1.2...

Embodiment 2

[0053] Add 0.05g of PVA-124 to a stirred glass flask, then add 75g of deionized water, and heat to 90°C to completely dissolve the PVA-124 to form a uniform transparent sol A1.

[0054] In another glass flask with stirring, 175 g of ethylenediamine, 70 g of ethanolamine, and 200 g of deionized water were added to obtain a mixed solution. Slowly add silver oxalate into the obtained mixed solution under stirring, keep the temperature at 10-25° C. to completely dissolve the silver oxalate, and add the amount of silver oxalate so that the final impregnating solution contains 26% by weight of silver. Add 2.5g of cesium nitrate, 0.5g of strontium acetate, and 2.25g of ammonium perrhenate, and then add deionized water to make the total mass of the solution reach 925g to prepare impregnating solution B1 for use.

[0055] Keep the temperature at 10-25°C, mix A1 and B1 and stir well. Take 250g of carrier A and put them into vacuumable containers respectively. Vacuum until the vacuum d...

Embodiment 3

[0057] Add 0.05g of PVA-124 to a stirred glass flask, then add 200g of deionized water, and heat to 90°C to completely dissolve the PVA-124 to form a uniform transparent sol. Then lower the temperature and keep it at 10-25°C, continue to add 175g of ethylenediamine and 70g of ethanolamine, and slowly add silver oxalate into the resulting mixture under stirring to completely dissolve the silver oxalate. The amount of silver oxalate added is such that the final The dipping solution contains 24% by weight of silver. Add 2.5g of cesium nitrate, 0.5g of strontium acetate, and 2.25g of ammonium perrhenate, and then add deionized water to make the total mass of the solution reach 1000g, and make an impregnation solution for use.

[0058]Take 250g of carrier A and put them into vacuumable containers respectively. Vacuum until the vacuum degree is lower than 10mmHg, put the above mixed impregnation solution into it, immerse the carrier, and keep it for 30 minutes. The excess macerati...

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Abstract

The present invention relates to an olefin epoxidation silver catalyst preparation method comprising the following steps: a) uniformly mixing a silver-containing impregnating solution with a sol to form a mixed solution; b) using a carrier for impregnation in the impregnating solution obtained in the step a), performing solid liquid separation, and drying an obtained solid; and c) activating the dried solid obtained by the step b). The present invention also relates to a silver catalyst obtained by the method and application thereof.

Description

technical field [0001] The invention relates to a preparation method of an industrial catalyst, in particular to a preparation method of an epoxidation catalyst. The invention also relates to the catalyst prepared by the method and the application of the catalyst. Background technique [0002] Industrially, silver catalysts are used to catalyze the epoxidation of olefins to produce alkylene oxides, especially to catalyze the epoxidation of ethylene to produce ethylene oxide. In this reaction, ethylene oxide is mainly produced, and carbon dioxide and water etc. are produced by side reactions at the same time. The main performance indicators of silver catalysts include their activity, selectivity and stability. Among them, activity generally refers to the reaction temperature required when the ethylene oxide production process reaches a certain reaction load, the lower the required reaction temperature, the higher the activity of the catalyst; selectivity refers to the moles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C07D303/04C07D301/10
Inventor 林强林伟李贤丰孙欣欣王辉任冬梅曹淑媛李金兵陈建设张志祥
Owner CHINA PETROLEUM & CHEM CORP
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