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A kind of continuous preparation of toluene diisocyanate Chuan-shaped high-gravity device and process

A technology of toluene diisocyanate and high gravity, which is applied in the preparation of isocyanic acid derivatives, the preparation of organic compounds, chemical/physical/physicochemical nozzle reactors, etc., can solve the problem of the decrease of conversion rate and the difference of material volume flow ratio large, poor reaction selectivity, etc.

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 continuous preparation of toluene diisocyanate Chuan-shaped high-gravity device and process
  • A kind of continuous preparation of toluene diisocyanate Chuan-shaped high-gravity device and process
  • A kind of continuous preparation of toluene diisocyanate Chuan-shaped high-gravity device and process

Examples

Experimental program
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Effect test

Embodiment 1

[0072] In a TDI manufacturer, the process and device of the present invention are used to carry out the pilot test, specifically as follows, using 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 is 1000Kg / h; the temperature of phosgene inert solvent solution is 70°C, the mass fraction concentration of phosgene is 20%, the mass flow rate is 15240kg / h, the volume flow ratio of phosgene and toluenediamine inert solution is approximately 15:1, enter the cold Reactor for reaction, using rotating packed bed supergravity structure, filler is wire mesh filler; cold reactor main feed pipe diameter d 5 100mm, main feed pipe diameter d 5 with main feed nozzle diameter D 1 The scale range is 50, the main feed pipe nozzle diameter D 1 is 2mm; the ratio range of the diameter of the auxiliary feed pipe to the diameter of the main feed pipe is 5, and th...

Embodiment 2

[0076] In a TDI manufacturer, the process and device of the present invention are used to carry out the pilot test, specifically as follows, using 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℃, the mass fraction concentration of phosgene is 50%, the mass flow rate is 37800kg / h, the volume flow ratio of phosgene and toluene diamine inert solution is approximately 4:1, enter The reaction is carried out in a cold reactor, which adopts a stator-rotor supergravity structure, and the filler is a metal foam filler; the diameter of the main feed pipe of the cold reactor is d 5 100mm, main feed pipe diameter d 5 with main feed nozzle diameter D 1 The scale range is 1, the main feed pipe nozzle diameter D 1 is 100mm; the ratio range of the diameter of the auxiliary feed pipe to the diame...

Embodiment 3

[0080] In a TDI manufacturer, the process and device of the present invention are used to carry out a pilot test, specifically as follows, using o-dichlorobenzene light solvent as an 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 11300kg / h, and the volume flow ratio of phosgene and toluenediamine inert solution is approximately 1:1. Reactor for reaction, using spiral channel supergravity structure, cold reactor main feed pipe diameter d 5 100mm, main feed pipe diameter d 5 with main feed nozzle diameter D 1 The scale range is 10, the main feed pipe nozzle diameter D 1 is 10mm; the ratio range of the diameter of the auxiliary feed pipe to the main feed pipe is 0.5, and the diameter of the auxiliary feed pipe is d 6 , d 7 50mm; the diameter of...

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Abstract

The invention belongs to the technical field of toluene diisocyanate production, and specifically relates to a continuous preparation of toluene diisocyanate with a river-shaped supergravity device and process, which solves the problem of large differences in material volume flow ratio in the existing production process of toluene diisocyanate , the reaction selectivity becomes poor, causing the conversion rate to drop, which may cause the problem of reaction device failure. High gravity device, including cold reactor and thermal reactor, cold reactor includes non-limiting impingement flow structure and high gravity structure, non-limiting impingement flow structure includes auxiliary feed pipe I, auxiliary feed pipe II and main feed Tube. In the process, the phosgene inert solution and the toluene diamine inert solution collide through a non-restricted impingement flow reactor, then enter a rotating packing, and then enter a thermal reactor to react to generate a crude toluene diisocyanate 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, and in particular relates to a Kawagata supergravity device and process for continuously preparing toluene diisocyanate. Background technique [0002] Toluene diisocyanate (TDI) is a mixed type of isocyanate. The most 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C265/14C07C263/10B01J19/26
Inventor 刘有智祁贵生焦纬洲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