Column tube type impinging stream reactor and operating system for producing toluene diisocynate

Abstract

The invention relates to a column tube type impinging stream reactor and an operating system for producing toluene diisocynate. The upper head of the column tube type impinging stream reactor is connected with a barrel body on which a barrel body feeding hole (4) is arranged, the column tubes pass through the barrel body and are evenly distributed on the upper tube-plate and the lower tube-plate in the barrel body, jet orifices (10) of the lower tube-plate are evenly distributed on the lower tube-plate; the lower end of the column tube is connected with an expanding section of the column tube; and the jet orifices (9) of the column tubes are arranged on the lower ends of the column tubes and the expanding sections of the column tubes. A stream of material is injected by the jet orifices (10) of the lower tube-plate in a jet current mode; around the jet orifices of the lower tube-plate, the column tubes and column tube expanding sections are arranged in parallel and are vertical to the lower tube-plate; the other stream of fluid is injected into an impinging mixed zone with a certain angle in a jet current mode by the jet orifices (9) of the column tubes arranged on the column tubes and the column tube expanding sections and is impacted with the first stream of material and then is quickly mixed; and the reaction material enters into a second reaction zone (12) for further reaction. The size of the impinging mixed zone can be flexibly changed by adjusting the structure parameters of the mixed zone, therefore, the reactor has strong adaptability.

Description

technical field [0001] The invention relates to a device and method for producing organic isocyanate, in particular to a tubular impingement flow reactor and an operating system for producing toluene diisocyanate. Background technique [0002] Organic isocyanate is an important organic intermediate, which is widely used in polyurethane, coating, dyestuff and other industries. Isocyanates mainly include: toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethyl polyphenylene isocyanate (PAPI) and phenylisocyanate (PI). The production of organic isocyanate can be divided into two routes: phosgene method and non-phosgene method. Among them, the industrial production is mainly phosgenation method, that is, isocyanate is prepared by reacting the corresponding amine with phosgene. [0003] The method of producing isocyanate by phosgenation can be divided into gas phase phosgenation and liquid phase phosgenation. There are many gas-phase phosgenation patents disc...

AI Technical Summary

Problems solved by technology

[0013] Chinese patent CN1304927A discloses a method and reactor for preparing a toluene diisocyanate (TDI): a jet reactor is used to complete the rapid mixing of materials and the first step of photochemical reaction, wherein the first material is liquid phosgene or dissolved in The toluenediamine solution of the solvent is atomized into droplets by a rotary atomizer and then enters the mixer, while the other material, the toluenediamine solution or phosgene dissolved in the solvent, is sprayed into the ring gap of the reactor and mixed with the first material High-speed mixing, the jet reactor has a special striker structure, the patent believes that there is no clogging problem with the nozzle, but the structure is more complicated

The above mixing method cannot achieve a good mixing effect, and by-products may block the pores

[0017] In summary, the main problems existing in the process of producing toluene diisocyanate in the existing method are that by-products are inevitably generated, the reactor has potential blockage, and the amplification effect is large.

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