Stirring and grinding reactor and method for preparing isocyanate with same

Abstract

The invention relates to a stirring and grinding integrated reactor and a method for preparing isocyanate by using the reactor. The reactor comprises a reactor shell, a first reactant feeding hole, a first reactant distributing tray, a second reactant main feeding hole, an annular second reactant distributing tray, a stirring shaft, an axial stirring paddle, a radial stirring paddle, a dynamic grinding sheet, a static grinding sheet and at least one second reactant sub feeding hole, wherein the dynamic and static grinding sheets are provided with a plurality of passage holes. Quick mixing and quick reaction between the raw materials are realized by axial and radial strong stirring and a feeding method of a strongest mixing area, and the solid reaction product is further pulverized by hole passage type quick grinding combined through multilayer dynamic and static grinding trays so as to enhance the reaction effect, improve the yield and quality of the isocyanate, reduce the using amount of a solvent and the excess ratio of phosgene, improve the yield of the device, improve the quality of the product and reduce the energy consumption.

Description

technical field [0001] The present invention relates to a stirring and grinding reactor and its application, more specifically, to a reactor integrating stirring and grinding which can realize rapid mixing and rapid reaction between fluids (gas-gas or liquid-liquid) and A process for preparing isocyanates using the reactor. Background technique [0002] In the chemical production process, when complex fast parallel competitive reactions or fast series competitive reactions occur between the reaction materials, the reaction products or intermediate products may further react with certain components in the raw materials; the degree of these reactions is related to each It is directly related to the concentration distribution of various materials (such as raw materials, intermediate products, etc.). Therefore, the initial mixing effect between raw materials will greatly affect the final product distribution, the yield and quality of the target product, and at the same time aff...

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Problems solved by technology

[0008] The current domestic and foreign patents are mainly cross-flow mixing, in which hole jet flow is a main method, which injects many small streams into the main stream, and after injection, each small stream is quickly surrounded by the main stream, passing through the fluid The turbulent state of the two streams realizes the mixing between the two streams, such as a hole jet jet injector described in US Patent No. 3,226,410. When the jet stream enters the main fluid, it can only reach a certain jet depth. In this way, when the pipe diameter of the main flow is small, the rapid mixing between the two fluids can be achieved, but when the production capacity is large, the main flow The diameter of the pipeline is also relatively large, and the stream injected from the jet hole cannot be fully dispersed into the main flow in a short period of time, which will inevitably lead to no mixing in the center of the main flow circular tube for a long distance. The time is extended accordingly. When the required mixing time scale is fixed, the production capacity of the reactor also has a maximum limit. The rate needs to greatly reduce the concentration of reactants, resulting in the need for greater energy consumption to recover the solvent

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