Synthesis device and method for xylylene diisocynate

Abstract

The invention provides a synthesis device for xylylene diisocynate. The synthesis device comprises a reaction kettle, a gas distributor mounted in the reaction kettle, and a phosgene feeding device communicated with the reaction kettle, wherein the phosgene feeding device comprises a mixed gas cavity, a pressure adjustment assembly for adjusting pressure in the mixed gas cavity, a multihole limiting flow division plate mounted in the mixed gas cavity, and a spherical control valve mounted in the mixed gas cavity, wherein the mixed gas cavity is provided with a phosgene inlet and an inert gas inlet; the multihole limiting flow division plate is arranged between the phosgene inlet and the spherical control valve and between the inert gas inlet and the spherical control valve; and the spherical control valve is communicated with the gas distributor. The synthesis device has the advantages of scientific design, reasonable structure, high production efficiency, reliable product quality. The invention further provides a method for synthesizing xylylene diisocynate by adopting the synthesis device.

Description

technical field [0001] The invention relates to a synthesis device and a synthesis method of xylylene diisocyanate. Background technique [0002] The synthesis of high-boiling point isocyanate compounds generally adopts the salt-forming phosgene method, that is, first forms a salt with hydrogen chloride or carbon dioxide, and then undergoes luminescence and thermo-light reactions with phosgene. Although this method can inhibit the reaction of isocyanate and excess phosgene to form urea, but It is not very obvious to reduce the by-products in the production process, and the waste of energy is relatively serious. [0003] Chinese patent CN2444949Y discloses a jet reactor for preparing toluene diisocyanate. It is said that the reactor can achieve uniform mixing of phosgene and reactant materials, and has the function of preventing clogging, but the design is complicated and the manufacture is difficult. It is widely used in actual production. [0004] Chinese patent CN1011421...

AI Technical Summary

Problems solved by technology

[0002] The synthesis of high-boiling point isocyanate compounds generally adopts the salt-forming phosgene method, that is, first forms a salt with hydrogen chloride or carbon dioxide, and then undergoes luminescence and thermo-light reactions with phosgene. Although this method can inhibit the reaction of isocyanate and excess phosgene to form urea, but It is not very obvious to reduce the by-products in the production process, and the waste of energy is serious

[0003] Chinese patent CN2444949Y discloses a jet reactor for preparing toluene diisocyanate. It is said that the reactor can achieve uniform mixing of phosgene and reactant materials, and has the function of preventing clogging, but the design is complicated and the manufacture is difficult. Widely used in actual production

Xylylene diisocyanate is a kind of high-boiling point isocyanate compound. It is synthesized by the existing high-boiling point isocyanate compound synthesis device, but there are still problems such as high cost, low efficiency, and poor product quality.

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