A kind of microchannel reactor and the method using it to produce magnetic titanium silicon molecular sieve

Abstract

The invention provides a micro-channel reactor and a method applying the micro-channel reactor to produce a magnetic titanium silicalite. The novel micro-channel reactor is designed by analyzing and calculating the fluid field distribution of the reactor, and adopts a secondary micro-channel structure. A static grinding disc inner chamber of the reactor is provided with secondary reducing diameters of opposite directions; the upper reducing diameter of the static grinding disc inner chamber and the outer wall of a falling film cylinder form a primary falling film micro-channel; the lower reducing diameter of the static grinding disc inner chamber and the outer side wall of a movable grinding disc form a secondary react micro-channel. Two kinds of solution entering the reaction vessel are conducted by compulsive micro mixing instantly in the reactor; small seed crystals are generated at a high speed, and are conducted by adsorption regrowth on magnetic nanometer particles to obtain the magnetic loading modified titanium silicalite eventually; catalyst performance is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of catalyst production, and in particular relates to a microchannel reactor and a method for producing magnetic titanium-silicon molecular sieves using the same. Background technique [0002] A new titanium-silicon molecular sieve with excellent directional catalytic oxidation performance was formed by introducing transition metal titanium into the molecular sieve framework with ZSM-5 structure. It not only has the catalytic oxidation of titanium, but also has the shape-selective effect of ZSM-5 and excellent stability, oxidation, and specific selectivity. The green low-temperature catalytic system composed of titanium-silicon molecular sieve as catalyst and hydrogen peroxide as oxidant can catalyze the oxidation of various organic compounds under mild conditions, such as hydroxylation of phenol and aromatic hydrocarbons, olefin epoxidation, ketone ammoximation, Partial oxidation of amines and saturated alk...

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Problems solved by technology

In particular, the particle size of the titanium-silicon molecular sieve catalyst used in the ammoximation reaction is too small, and the reaction product needs to be transported to the filter device for separation of the catalyst, and the filter device needs high-frequency recoil regeneration, the processing load of the filter system is large, and the maintenance cycle Short, resulting in high frequency of driving and stopping

[0004] The traditional process mainly uses a tank reactor to prepare molecular sieves. The liquid-liquid two-phase mixing is achieved by stirring. The mixing space is the entire stirred tank, and the time is several to tens of hours. It is limited by the concentration gradient, the reaction rate and the diffusion rate. Slow, the mixing is not sufficient, and the impurity phase is easy to appear during the reaction, which limits the catalytic performance of the material

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