Method for preparing titanium silicon molecular sieve catalyst

Abstract

The invention discloses a method for preparing a titanium silicon molecular sieve catalyst. The method comprises the following steps of: mixing titanium silicon molecular sieve powder, polymer monomer styrene, a polymer monomer multi-alkenyl compound and a pore-forming agent completely; in the presence of an initiator, performing a polymerization reaction; smashing the obtained blocky solid catalyst; adding the smashed catalyst into halohydrocarbon to swell; and performing extraction by using a solvent to obtain the formed titanium silicon molecular sieve catalyst. The titanium silicon molecular sieve catalyst prepared by the method solves the problem that the titanium silicon catalyst powder and reaction solution are difficult to separate and improves the reaction efficiency. The titanium silicon molecular sieve catalyst is applied to a catalytic reaction of alkene epoxidation of a fixed bed process and has excellent catalytic effect.

Description

technical field [0001] The invention belongs to a preparation method of a titanium-silicon molecular sieve catalyst, which is suitable for catalytic reaction processes such as epoxidation of olefins. 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 molecular sieve catalysts exhibit excellent shape-selec...

AI Technical Summary

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