Solid acid catalyst supporting methane sulfonic acid, preparation method and application of same

Abstract

The invention relates to a solid acid catalyst supporting methane sulfonic acid, a preparation method and an application of the same. In particular, the invention provides a strong acidic solid acid catalyst for removing olefin components from aromatic hydrocarbon, wherein the strong acidic solid acid catalyst is in the form of an amorphous state and includes amorphous silicon dioxide and the methane sulfonic acid supported thereon. The strong acidic solid acid catalyst is prepared through following steps: (1) under a water-free condition, mixing tetraethoxysilane (TEOS) and anhydrous formic acid to obtain a homogeneous solution; (2) adding the methane sulfonic acid and mixing the mixture continuously to form a catalyst intermediate; and (3) roasting the intermediate to obtain the strong acidic solid acid catalyst. The invention also provides the preparation method and the application of the strong acidic solid acid catalyst. The strong acidic solid acid catalyst has an excellent catalytic performance. Successful preparation and application of the catalyst develops a new way of novel green industrialization.

Description

Technical field [0001] The invention relates to the polyester synthesis industry, in particular to a strong acid solid acid catalyst for removing aromatic hydrocarbons, especially olefin components in p-xylene. The strong acid solid acid catalyst is prepared under anhydrous conditions using ethyl orthosilicate (TEOS) as a silicon source, anhydrous formic acid as a hydrolysis catalyst, and methanesulfonic acid as an acid modifier. The invention also relates to a preparation method of the strong acid solid acid catalyst and the application of the strong acid solid acid catalyst for removing olefin components in the production of aromatic hydrocarbons, especially p-xylene. technical background [0002] In recent years, with the rapid development of my country's polyester industry and the vigorous intervention of private enterprises, my country's demand for terephthalic acid has continued to grow. As the direct upstream raw material of terephthalic acid, the demand for p-xylene is n...

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Problems solved by technology

[0004] (1) Hydrogenation process, this process is very effective for reducing the bromine index, but the process operation requirements are high and difficult, and the use of hydrogen is also relatively dangerous, so the scope of use is limited;

[0005] (2) White clay refining process, which is very simple to operate and has a high safety factor, and is adopted by most refineries, but the white clay in this process is easily deactivated under the condition of high bromine index, which causes a large amount of solid waste emissions and waste of national mineral resources

[0006] In order to concentrate the strengths of the above two processes and abandon their shortcomings, many methods have been studied, such as various modifications to clay to prolong its service life, but the effect is still limited

[0007] In previous studies, it was found that liquid pure methanesulfonic acid has a good effect on catalyzing the alkylation reaction of aromatics and olefins, and methanesulfonic acid is an environmentally friendly organic acid, which can be used in natural environment for 28 days It is decomposed into carbon dioxide, water and sulfur dioxide, but as a liquid acid, its scope of use is obviously limited, and it is difficult to use it on an industrial scale in existing processes

[0008] At present, there have been some reports on the introduction of sulfonic acid groups into the surface of silica, but they either require the use of templates, or the precursors of oxidants or sulfonic acid groups, and need to be washed in the later stage, which makes the production process difficult. Environmental pollution, and the operation process is cumbersome, which is not conducive to practical use

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