Solid acid catalyst and preparation method and applications thereof

Abstract

The invention relates to a solid acid catalyst and a preparation method and applications thereof. The catalyst includes lanthanide rare earth metal ions, halogen and a carrier. The carrier includes aboron-silicon composite oxide and silicon oxide; and the boron-silicon composite oxide is an amorphous compound, and can be obtained by mixing boron source and silicon source compounds, adjusting pH to form gel, adding a surfactant as a pore forming agent during a gel synthesizing process, and performing hydrothermal reaction, hole expansion with ammonia, drying and roasting, etc. According to thecatalyst, the amorphous boron-silicon composite having a high specific surface area and specific pore size distribution is molded to form the carrier and a lanthanide rare earth metal oxide which canform a specific acid site and the halogen are added for modification. The catalyst can be used for direct amination of isobutene to prepare tert-butylamine; and high isobutene one-way conversion rateand tert-butylamine selectivity can be achieved, and the catalyst has good stability.

Description

technical field [0001] The invention relates to a solid acid catalyst, in particular to a catalyst used for the amination of isobutene to prepare tert-butylamine and a preparation method thereof. Background technique [0002] Tert-butylamine is an important organic intermediate, which has a wide range of uses in the production of medicine, synthetic rubber and pesticides. In medicine, tert-butylamine can be used as an intermediate raw material for the synthesis of various drugs. The main use of tert-butylamine is to produce sulfenamide rubber vulcanization accelerator NS (N-tert-butyl-2-benzothiazole sulfenamide). With the increasingly stringent environmental protection regulations, the domestic "green" rubber accelerator NS With popularization and application, the output of NS will increase, and the demand for tert-butylamine will also increase accordingly, and NS will become the field that consumes the most tert-butylamine. In 2003, my country's NS output was about 3,800...

AI Technical Summary

Problems solved by technology

[0003] In the 1970s, foreign countries began to study the direct catalytic amination of isobutene to produce tert-butylamine, but it was not applied due to poor reaction selectivity and short catalyst life.

The templates required for the synthesis of such borosilicate molecular sieves are special, generally high-nitrogen compounds. Such templates are expensive due to their active nature and difficult synthesis, which directly leads to the high cost of such molecular sieves, which limits their industrial application.

[0010] In summary, the current conventional silica-alumina molecular sieves or amorphous silica-alumina materials have the disadvantage of easy carbon deposition and deactivation due to their too strong acid centers for the amination reaction of isobutylene, resulting in short catalyst life and limiting their continuous use; B Due to the low activity of conventional heteroatom molecular sieves modified by , Ga, etc., the one-pass conversion rate of isobutene is low and the reaction pressure needs to be high, resulting in a great increase in equipment costs; borosilicate molecular sieves such as MCM, PSH, and SSZ with special structures have Difficult to synthesize, difficult to prepare and expensive templating agent used, resulting in high cost and limiting industrial application

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