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A kind of device and process for continuously preparing toluene diisocyanate

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

Active Publication Date: 2016-09-14
ZHONGBEI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] 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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  • A kind of device and process for continuously preparing toluene diisocyanate
  • A kind of device and process for continuously preparing toluene diisocyanate
  • A kind of device and process for continuously preparing toluene diisocyanate

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Experimental program
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Effect test

Embodiment 1

[0066] 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

[0070] 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;

[0071] 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

[0075] 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.

[0076] 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, specifically a device and process for continuously preparing toluene diisocyanate, which solves the problem of reaction selectivity in the case of large differences in material volume flow ratio in the existing production process of toluene diisocyanate deterioration, resulting in a decrease in the conversion rate, which may lead to the problem of failure of the reaction device. The device includes a cold reactor and a hot reactor, the cold reactor includes a non-limited impact flow structure and a supergravity structure, and the non-limited impact flow structure includes a main feed pipe and a casing with different pipe diameters. Process, the phosgene inert solvent solution and the toluene diamine inert solvent solution quickly complete the macroscopic mixing and preliminary microscopic mixing through the non-restricted impinging flow structure opposite collision, and then enter the rotating packing, and after staying, enter the thermal reactor to generate toluene di Crude isocyanate TDI. The invention basically completely reacts the toluene diamine, prevents the generation of urea substances, effectively avoids the clogging of pipelines and reactors, and improves the production efficiency of toluene diisocyanate.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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