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Preparation method of absorbent used for removing impurities from olefin flows

A technology of adsorbent and olefin flow, which is applied to chemical instruments and methods, adsorption purification/separation, and other chemical processes, and can solve problems such as reduced reactivity, decreased adsorption capacity, increased amount of adsorbent, and increased volume of purification devices. Achieve the effect of low adsorption heat effect and uniform pore distribution

Active Publication Date: 2013-02-13
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through molecular sieve modification, adjust the pore channel or skeleton charge of zeolite molecular sieve to reduce the reactivity, which will inevitably lead to a decrease in the adsorption capacity of the adsorbent for impurities.
The decline in the capacity of adsorbing impurities will increase the amount of adsorbent and the volume of the purification device, which will increase the investment cost of the device, and there will be problems such as incomplete regeneration during the regeneration operation. The adsorption capacity of the adsorbent will decrease rapidly due to the increase in the number of regenerations.

Method used

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  • Preparation method of absorbent used for removing impurities from olefin flows
  • Preparation method of absorbent used for removing impurities from olefin flows
  • Preparation method of absorbent used for removing impurities from olefin flows

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 24.7g pseudoboehmite (content 63.5%) was mixed with 10g sodium hydroxide and 100g deionized water and stirred for 30 minutes, and 67.1g silica sol (SiO 2 31%, Na 2 O10.2%) mixed with 100g of deionized water and stirred for 20 minutes, slowly added silica sol solution to the container containing aluminum source solution, stirred at high speed for 30 minutes, added 65g of deionized water during the stirring process, and then quickly added 1 ~ 3mm Particle size, specific surface area is 250m 2 / g, 21g of activated alumina balls with a pore volume of 0.35ml / g, stirred for 15 minutes and aged at room temperature 25°C for 4 hours, and the resulting sol containing alumina particles was transferred to a reaction with a polytetrafluoroethylene liner In the kettle, crystallize at 100°C for 12 hours, separate the solid and liquid to take out the product, wash the 1-3mm solid particles with deionized water to pH = 8-9, and dry at 100°C for 10 hours to obtain the intermediate prod...

Embodiment 2

[0034] The molecular sieve sol was prepared according to the above-mentioned Example 1, but the amount of activated alumina spheres was changed from 21 g to 13 g. After stirring for 15 minutes, it was aged at room temperature at 25° C. for 4 hours, and the resulting sol containing alumina particles was transferred into a polysaccharide-containing sol. In a reaction kettle lined with tetrafluoroethylene, crystallize at 100°C for 12 hours, separate the solid and liquid to take out the product, wash the 1-3mm solid particles with deionized water to pH = 8-9, and dry at 100°C for 10 hours to prepare The intermediate product Example 2-1 was obtained, and then activated by calcination at a temperature of 450°C for 2 hours to obtain the product example 2-2. It was confirmed by XRD that the diffraction peak of the molecular sieve was the characteristic peak of 13X. After the oxide composition was tested by XRF, the composition (wt%) of product example 2-2 was 86.6% alumina, 13.4% 13X m...

Embodiment 3

[0036] Using the intermediate product example 2-1 instead of activated alumina balls as the carrier, the rest of the steps are the same as in Example 1, corresponding to the intermediate product example 3-1 and the product example 3-2. It was confirmed by XRD that the diffraction peak of the molecular sieve was the characteristic peak of 13X. After the oxide composition was tested by XRF, the composition (wt%) of product example 3-2 was 78.9% alumina, 21.1% 13X molecular sieve.

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Abstract

The invention relates to a preparation method of an absorbent used for removing impurities from olefin flows. The absorbent contains components of zeolite molecular sieves, activated alumina and metal oxides. The preparation method adopts an in-situ synthesis method and an ion exchange method: the zeolite molecular sieves are synthetized on an activated alumina carrier, and then the metal oxides are loaded on the absorbent through ion exchange. Compared with the prior art, the absorbent prepared by adopting the preparation method has the advantages of even pore distribution and low absorption heat effect, performs a deep absorption function, can be used for removing one or more mixtures from carbon dioxide, hydrogen sulfide, carbonyl sulfide, methanol, mercaptan, ammonia, or other impurity compounds containing O, S or N from the olefin flows of ethylene, propylene, or the like.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent, in particular to a method for preparing an adsorbent for removing impurities in olefin streams. Background technique [0002] With the improvement of the activity of polyolefin catalysts, the purity requirements of catalysts for ethylene, propylene, butene and other raw material streams are also increasing. Due to the limitations of raw material sources and processes, whether it is traditional cracking method or olefins made from methanol, Usually contain a variety of impurities, these impurities include H 2 O, O 2 , CO, CO 2 , alcohols, ethers and other oxygenated compounds, H 2 S, COS, CS 2 , mercaptan, thioether and other sulfur-containing compounds, NH 3 , Nitrogen-containing compounds such as amines. The content of the above-mentioned impurities is generally required to be at the ppm level in order to ensure the high activity of the subsequent polymerization catalyst. The cost of...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C07C7/13C07C11/06C07C11/04C07C11/08
Inventor 王鹏飞何秋平徐华胜李豫晨周永贤
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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