High Shear Reactors for Fast Competing Reactions

Abstract

The invention discloses a high-shear reactor for a rapid competitive reaction. The high-shear reactor comprises a cylindrical shell, a rotor, a stator and a main transmission shaft, wherein the cylindrical shell is provided with a discharging hole; a first feeding tube is arranged at the center position of an end wall at one end of the cylindrical shell; a radial flow impeller is arranged at the tail end of the main transmission shaft and interior of the innermost-circle rotor teeth; feeding stator teeth 2 being of a hollow structure are arranged between primary innermost-circle rotor teeth and secondary innermost-circle rotor teeth; a hollow part of the feeding stator teeth 2 is communicated with a second feeding tube 10 through an annular hollow structure 12 in the end wall 11; the feeding stator teeth 2 are provided with discharging holes 9. By adopting the reactor, two strands of materials can be effectively prevented from coming into contact in a non-height turbulent area, a strand of the materials fed from the center can get greater kinetic energy, back-mixing of the materials is prevented, and the two strands of the materials are mixed uniformly within a millisecond. The occurrence of side reactions is avoided, and the yield is increased greatly; the high-shear reactor is low in cost, and is easy to operate.

Description

technical field [0001] The present invention relates to a high shear reactor for fast competing reactions. Background technique [0002] Rapid competitive reaction means that in a reaction system, reactants rapidly participate in several chemical reaction processes with different reaction rates, such as phosgenation reaction, diazonium coupling reaction, nitration reaction, etc. The reaction process is more sensitive to the mixing process, and the quality of the mixing directly affects the yield of the target product and the quality of the final product. [0003] A typical application of fast competing reactions is the preparation of toluene diisocyanate (TDI) by phosgenation of primary amines. The main reaction is as follows: [0004] [0005] Reaction (1) is the main reaction to generate toluene diisocyanate, and the degree of reaction depends largely on the degree of mixing. During the reaction process, the reaction materials need to reach a rapid and uniform mixing ...

AI Technical Summary

Problems solved by technology

However, the interior of the innermost ring rotor of the interlocking high-shear reactor is a non-highly turbulent zone, and the materials entering the high-shear chamber cannot be dispersed effectively in an instant, which will lead to back-mixing of the materials in this interval. And induce the occurrence of many side reactions, which is unfavorable for the fast competitive reaction, and will affect the quality and yield of the final product

Images