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Device and technology for continuous preparation of toluene diisocyanate

A technology of toluene diisocyanate and toluene diamine, which is applied in the field of devices for continuous preparation of toluene diisocyanate, can solve the problems of large difference in material volume flow ratio, poor reaction selectivity, failure of reaction device, etc., and achieves the reaction volume flow ratio Wide, prevent the formation of urea substances, improve the effect of production efficiency

Active Publication Date: 2015-04-08
ZHONGBEI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0036] The present invention solves the problem that the reaction selectivity becomes poor, the conversion rate decreases, and the reaction device may fail when there is a large difference in the material volume flow ratio in the existing production process of toluene diisocyanate.

Method used

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  • Device and technology for continuous preparation of toluene diisocyanate
  • Device and technology for continuous preparation of toluene diisocyanate
  • Device and technology for continuous preparation of toluene diisocyanate

Examples

Experimental program
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Effect test

Embodiment 1

[0065] In a TDI manufacturer, the process and device of the present invention are used to carry out the pilot test, specifically as follows with o-dichlorobenzene light solvent as the inert solvent, the temperature of the configured toluene diamine inert solvent solution is 110 ° C, the mass fraction is 40%, and the mass flow rate The temperature of phosgene inert solvent solution is 70°C, the mass fraction concentration of phosgene is 20%, the mass flow rate is 15320kg / h, and the volume flow ratio of phosgene and toluene diamine inert solvent solution is approximately 15:1. It enters the cold reactor for reaction, adopts a rotating packed bed type supergravity structure, and the filler is a wire mesh filler; the diameter of the main feeding pipe is d 1 100mm, main feed pipe diameter d 1 and main feed pipe discharge hole diameter D 1 The ratio is 25, the diameter of the discharge hole of the main feed pipe is D 1 4mm, the speed that the toluene diamine inert solvent solution...

Embodiment 2

[0069] In a TDI manufacturer, the process and device of the present invention are used to carry out the pilot test, specifically as follows with o-dichlorobenzene light solvent as the inert solvent, the temperature of the configured toluene diamine inert solvent solution is 150 ° C, the mass fraction is 40%, and the mass flow rate The temperature of phosgene inert solvent solution is 110°C, the mass fraction concentration of phosgene is 50%, the mass flow rate is 37800kg / h, and the volume flow ratio of phosgene and toluene diamine inert solvent solution is approximately 4:1. It enters the cold reactor for reaction, adopts stator-rotor supergravity structure, and the filler is metal foam filler;

[0070] Main feed pipe diameter d 1 80mm, the main feed pipe diameter d 1 and main feed pipe discharge hole diameter D 1 The ratio is 2.4, the diameter of the discharge hole of the main feed pipe is D 1 is 33.3mm, the velocity of phosgene flowing out from the discharge hole of the c...

Embodiment 3

[0074] In a TDI manufacturer, the process and device of the present invention are used to carry out the pilot test, specifically as follows with o-dichlorobenzene light solvent as the inert solvent, the temperature of the configured toluene diamine inert solvent solution is 120 ° C, the mass fraction is 30%, and the mass flow rate The temperature of phosgene inert solvent solution is 90°C, the mass fraction concentration of phosgene is 20%, the mass flow rate is 75000kg / h, and the volume flow ratio of phosgene and toluene diamine inert solvent solution is approximately 7:1. Enter the cold reactor for reaction.

[0075] It enters the cold reactor for reaction, adopts spiral channel supergravity structure, and the diameter of the main feed pipe is d 1 300mm, main feed pipe diameter d 1 and main feed pipe discharge hole diameter D 1 The ratio is 50, the diameter of the discharge hole of the main feed pipe is D 1 is 6mm, the velocity of phosgene flowing out from the discharge h...

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Abstract

The invention belongs to the technical field of toluene diisocyanate production and discloses a device and technology for continuous preparation of toluene diisocyanate. The device and technology solves the problem that the existing toluene diisocyanate production technology has large difference of a material volume flow ratio, poor reaction selectivity, a low conversion rate and can cause reaction device fault. The device comprises a cold reactor and a heat reactor. The cold reactor comprises an unlimited impinging stream structure and a hypergravity structure. The unlimited impinging stream structure comprises a main material feeding pipe and a sleeve pipe, and the pipes have different diameters. The technology comprises that a phosgene inert solvent and a toluenediamine inert solvent solution are oppositely collided by the unlimited impinging stream structure so that macroscopic mixing and preliminary microscopic mixing are fast finished, and the mixture is fed into a rotating filler, stays for some time, then is fed into the heat reactor and undergoes a reaction to produce a toluene diisocyanate TDI crude product. The device and technology realize basically complete toluene diisocyanate reaction, prevent urea substance generation, effectively prevent pipe and reactor blocking and improve toluene diisocyanate production efficiency.

Description

technical field [0001] The invention belongs to the technical field of toluene diisocyanate (TDI) production, and particularly relates to a device and a process for continuously preparing toluene diisocyanate. Background technique [0002] TDI is a mixed isocyanate, commonly used in the industry is a mixture of two isomers of 2,4-TDI and 2,6-TDI in a mass ratio of 80:20. Its production methods mainly include phosgene method and non-phosgene method. However, so far, the method for industrial production of TDI at home and abroad mainly adopts the phosgenation process, and the production of TDI by phosgene mainly includes five steps: (1) carbon monoxide and chlorine react to generate phosgene; (2) toluene reacts with nitric acid to generate phosgene Dinitrotoluene (DNT); (3) DNT reacts with hydrogen to generate toluenediamine (TDA); (4) Treated dry TDA reacts with phosgene to generate (TDI); (5) Purification of TDI. The phosgenation reaction of TDI production refers to the pr...

Claims

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Application Information

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IPC IPC(8): C07C263/10C07C265/14
Inventor 刘有智焦纬洲祁贵生李改英田晓钧姜同坤袁志国许承骋王月玲范辉郭文满吕来军
Owner ZHONGBEI UNIV
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