Modified adsorbent for adsorption separation and preparation method and application thereof

Abstract

The invention discloses a modified adsorbent for adsorption separation and a preparation method and application thereof, which belong to the technical field of petroleum and chemical engineering. On the basis of an industrial product molecular sieve or a catalyst, through modification optimization, on the premise that the original surface microstructure is not damaged, better specific surface area, adsorption capacity and diffusivity are achieved, and directional selectivity and better mechanical strength are achieved. The modified adsorbent can be widely applied to the fields of aromatic isomers, diamine isomers, phenolic isomers and polyhydric alcohol isomers in a liquid chromatography adsorption separation technology, is further widely applicable to the fields of adsorption dehydration, catalyst carriers, removal of organic matters in wastewater and waste gas and the like, and is particularly applicable to a cordierite honeycomb catalytic module with a higher mechanical strength requirement. The modified adsorbent has important application in the fields of rapid thermal cracking catalytic reforming and the like, and meanwhile, the more stable catalyst or molecular sieve adsorbent is more easily applicable to adsorption of harmful substances such as indoor formaldehyde and the like.

Description

technical field [0001] The invention belongs to the technical fields of petroleum and chemical industry, and in particular relates to a modified adsorbent used for adsorption separation and its preparation method and application. Background technique [0002] As we all know, the excellent performance of catalysts or molecular sieves has been widely used in chemical industry, industrial catalysis, chemical production and other fields. However, regardless of the supported catalysts or molecular sieves, or conventional direct use, they all need to go through a molding process, during which some fillers will be added , such as kaolin, attapulgite, and additives, such as water glass, silica sol, and catalyst or molecular sieve active ingredients are sprayed onto the surface of cordierite honeycomb ceramics to make a regular honeycomb catalytic module. During this period, a large number of fillers and additives are used. , to a certain extent affect the surface physical properties...

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Problems solved by technology

However, it is also mentioned in the literature that the use of too high a concentration of lye can easily lead to serious desiliconization and damage the physical microstructure of the surface. Not only does the lifting effect not be achieved, but the silicon-aluminum ratio is reduced, and even structural damage, collapse and other problems , while industrial molecular sieves or catalysts are often formed structures, relatively stable, and not easy to crystallize in situ. By using a compound alkali solution, which contains silicon sources and aluminum sources, it can play a certain role in modification, but the general crystallization time Longer, easy to generate P and other miscellaneous crystals, and it is not the optimal process condition

[0004] Patent CN 111482157A mentions a method for preparing binder-free pure silicalite-3 adsorbent, using silica as binder, pure silicalite-1 as precursor, using water vapor, through gas-solid Phase inversion crystallization method to synthesize binder-free pure silicalite-3 adsorbent. As mentioned in the article, this method needs to use high-pressure reactor as the main preparation device, and needs to use hydrothermal reaction to synthesize the precursor binder-free pure silicalite-3 adsorbent first. Silica-1, although no additives such as binders are used, the operation is cumbersome, the cost is high, and it is not easy to scale up production

[0005] In the current relevant patents, such as CN111097372A, CN101497022B, CN105263616A, etc., it is generally aimed at a specific type of catalyst or molecular sieve raw powder, adding a certain amount of filler to make particles of a specified shape, and then undergoing lye treatment, and finally exchanging specific metal ions. There are certain limitations, it is not convenient for wide application, and the applicability is low

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