Titanium-silicon molecular sieve and resin composite catalyst and preparation method thereof

Abstract

The invention discloses a titanium-silicon molecular sieve and resin composite catalyst and a preparation method thereof. The catalyst mainly comprises a titanium-silicon molecular sieve and resin. The preparation method comprises the following steps of: fully mixing titanium-silicon molecular sieve powder, a polymeric monomer and a porogen, performing polymerization reaction in the presence of an initiator to obtain a blocky solid catalyst, crushing, adding into halogenated hydrocarbon for swelling, and performing solvent extraction to obtain a formed catalyst. The catalyst prepared by the method solves the problem that titanium-silicon catalyst powder and reaction liquid are difficult to separate, improves reaction efficiency, is applied to the catalytic reaction process of olefin epoxidation in a fixed bed process, and has good catalytic effect.

Description

technical field [0001] The invention belongs to a composite catalyst of titanium-silicon molecular sieve and resin and a preparation method thereof, which is suitable for the fixed-bed catalytic reaction process of olefin epoxidation and the like. Background technique [0002] Since the Italian Enichem company first synthesized the lattice oxygen-selective titania-silicon molecular sieve catalyst TS-1 in 1983, it has become a hot spot in the research of oxidation catalysts due to its excellent oxidation selectivity and mild reaction conditions, and this discovery is regarded as environmentally friendly. A major breakthrough in catalyst development. [0003] Titanium-silicon molecular sieve catalysts play a very important role in the selective oxidation of organic compounds, such as the epoxidation of propylene with hydrogen peroxide under the action of titanium-silicon molecular sieve catalysts to prepare propylene oxide. In industrial applications, titanium-silicon molecul...

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Problems solved by technology

[0007] CN1256274A has proposed the technology that titanium-silicon molecular sieve catalyzes propylene, hydrogen peroxide epoxidation to continuously produce propylene oxide, in this process, catalyzer exists with slurry state, although obtained better raw material conversion rate and product yield, but because catalyzer It is in a slurry state and needs to be separated from the product after the reaction for reuse

This leads to a cumbersome process flow, which is not conducive to large-scale industrial production. In addition, in the process, the catalyst will also have unavoidable loss.

The TS-1 of CN1639143A catalyzes the epoxidation of propylene and hydrogen peroxide, and adopts the reaction mode of autoclave, which still does not solve the problem of difficult separation of catalyst and product