MFI zeolite-based adsorbent as well as preparation method and application thereof

CN121103310APending Publication Date: 2025-12-12GUANGDONG UNIV OF PETROCHEMICAL TECH
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Patent Information

Application Number
CN202511427921.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-30
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing technologies are unable to effectively remove basic nitrogen compounds from benzene, the raw material, during the ethylbenzene production process. This leads to problems such as abnormally high bed temperature in the hydrocarbonation reactor, decreased ethylene conversion rate, accelerated catalyst deactivation, and reduced ethylbenzene production.

Method used

A method for preparing MFI zeolite-based adsorbents was adopted, which involves grafting with mercaptosilanes and oxidation treatment to prepare sulfonic acid-modified MFI zeolite for adsorbing and removing basic nitrogen compounds at room temperature. This method avoids interference with the zeolite framework structure and ensures that functional groups are distributed in easily accessible positions.

Benefits of technology

It achieves efficient and rapid adsorption of alkaline nitrogen compounds, with large adsorption capacity and high removal rate. The adsorption material can be reused, reducing the risk of equipment corrosion and environmental pollution, and improving the stability and efficiency of ethylbenzene production.

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Abstract

The invention discloses an MFI zeolite-based adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing MFI zeolite; s2, carrying out stirring reaction on the MFI zeolite and a silane coupling agent containing sulfydryl in a solvent to obtain sulfhydrylation modified MFI zeolite; and S3, carrying out oxidation treatment on the sulfhydrylation modified MFI zeolite by using an oxidizing agent to obtain the MFI zeolite-based adsorbent. According to the adsorbent, sulfydryl-containing silane is grafted with MFI zeolite and then oxidized to obtain sulfonic acid modified MFI zeolite, the sulfonic acid modified MFI zeolite is applied to a method for adsorbing and removing basic nitrogen in raw material benzene, and the nitrogen adsorption rate is as high as 95.8%.
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