A method for preparing hydrophobic strong-acid carbon material based on alkylation reaction and its hydrophobic strong-acid carbon material

Abstract

The invention discloses a method for preparing hydrophobic strong acid carbon material based on alkylation reaction. The invention comprises the following steps: S1 causing the alkylation reaction between porous carbon material and chlorosulfonic acid compound under the action of catalyst, grafting sulfonic acid group to form strong acid carbon material; S2 alkylating the strong acid carbon material prepared in step S1 with chlorobenzene under the action of a catalyst, grafting a hydrophobic functional group, and generating a hydrophobic strong acid carbon material. The hydrophobic strong acidcarbon material prepared by the invention has hydrophobicity besides the advantages of general acid carbon material, can effectively isolate reaction sites and by-products, improve conversion and selectivity of reaction, has good cyclicity and stability, and is beneficial to continuous production in industry; the preparation process of hydrophobic strong acid carbon material is simple, the equipment requirement is low, and it is easy to industrialize.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a method for preparing a hydrophobic strong-acid carbon material based on an alkylation reaction and a hydrophobic strong-acid carbon material prepared according to the method. Background technique [0002] Acid-catalyzed reaction is an important reaction in the field of organic chemical industry. It is widely used in fine chemical processes such as olefin hydration, olefin polymerization, aromatic hydrocarbon alkylation, aromatic hydrocarbon acylation, and alkylation. It can be said that acid catalysis is the key to this series of important industries. Base. [0003] Acid catalysts are mainly divided into homogeneous catalysts and heterogeneous catalysts. Homogeneous catalysts generally have higher activity and lower cost, but the most commonly used homogeneous catalyst liquid acid (such as sulfuric acid) will not only corrode equipment, but also cause some side reactions due...

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Problems solved by technology

[0004] However, solid acid catalysts also have some disadvantages: (1) the activity of solid acid catalysts is not as good as that of liquid acids such as sulfuric acid; Low; (3) Generally, solid acid catalysts have weak hydrophobicity, and the polar by-product water is easily adsorbed on the acidic sites of the catalyst. At the same time, the weak polar reaction substrate is not easy to contact with the active sites, resulting in low catalyst activity and stability

The direct sulfonation method has a large load of sulfonic acid groups and many acid sites, but due to the hydrophilicity of the sulfonic acid groups, the resulting sulfonated biochar cannot be directly used as a hydrophobic catalyst.

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