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III-shaped hypergravity device and technology for continuous preparation of toluene diisocyanate

A toluene diisocyanate, hypergravity technology, applied in the preparation of isocyanic acid derivatives, the preparation of organic compounds, chemical/physical/physical-chemical nozzle reactors, etc., can solve the problem of poor reaction selectivity, reaction device failure, Problems such as declining conversion rates

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

[0038] 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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  • III-shaped hypergravity device and technology for continuous preparation of toluene diisocyanate
  • III-shaped hypergravity device and technology for continuous preparation of toluene diisocyanate
  • III-shaped hypergravity device and technology for continuous preparation of toluene diisocyanate

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Effect test

Embodiment 1

[0073] In a TDI manufacturer, the process and device of the present invention were used to carry out a pilot test. The details are as follows: o-dichlorobenzene light solvent is used as the inert solvent, the temperature of the toluene diamine inert solvent solution is 110°C, the mass fraction is 40%, and the mass flow rate The temperature of the phosgene inert solvent solution is 70℃, the mass fraction concentration of phosgene is 20%, the mass flow rate is 15240kg / h, and the volume flow ratio of phosgene to toluene diamine inert solution is approximately 15:1. The reactor is reacting with a rotating packed bed supergravity structure, and the filler is wire mesh packing; the diameter of the main feed pipe of the cold reactor is d 5 100mm, the main feed pipe diameter d 5 And main feed nozzle diameter D 1 The ratio range is 50, the main feed pipe nozzle diameter D 1 2mm; the ratio of the diameter of the secondary feed pipe to the diameter of the main feed pipe is in the range ...

Embodiment 2

[0077] In a TDI manufacturer, the process and device of the present invention are used for pilot experiments. The details are as follows: o-dichlorobenzene light solvent is used as the inert solvent, the temperature of the toluene diamine inert solvent solution is 150℃, the mass fraction is 40%, and the mass flow rate 9000Kg / h; the temperature of the phosgene inert solvent solution is 110℃, the phosgene mass fraction concentration is 50%, the mass flow rate is 37800kg / h, the volume flow ratio of phosgene to toluene diamine inert solution is approximately 4:1, enter The cold reactor is used for reaction, adopts a stator-rotor type supergravity structure, and the filler is metal foam filler; the diameter of the main feed pipe of the cold reactor is d 5 100mm, the main feed pipe diameter d 5 And main feed nozzle diameter D 1 The ratio range is 1, the main feed pipe nozzle diameter D 1 100mm; the ratio of the diameter of the secondary feed pipe to the diameter of the main feed pipe i...

Embodiment 3

[0081] In a TDI manufacturer using the process and device of the present invention to carry out a pilot test, the details are as follows: o-dichlorobenzene light solvent is used as the inert solvent, the temperature of the toluene diamine inert solvent solution is 120°C, the mass fraction is 30%, and the mass flow rate 10500Kg / h; the temperature of the phosgene inert solvent solution is 90℃, the phosgene mass fraction concentration is 20%, the mass flow rate is 11300kg / h, and the volume flow ratio of phosgene to toluene diamine inert solution is approximately 1:1. The reactor is used for reaction and adopts spiral channel type supergravity structure. The diameter of the main feed pipe of the cold reactor is d 5 100mm, the main feed pipe diameter d 5 And main feed nozzle diameter D 1 The ratio range is 10, the main feed pipe nozzle diameter D 1 10mm; the ratio of the diameter of the secondary feed pipe to the main feed pipe is 0.5, and the diameter of the secondary feed pipe d 6 ,...

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Abstract

The invention belongs to the technical field of toluene diisocyanate production and discloses an III-shaped hypergravity device and technology for continuous preparation of toluene diisocyanate. The device and technology solves the problem that the existing toluene diisocyanate production technology has poor reaction selectivity and a low conversion rate because of large difference of a material volume flow ratio thereby causing reaction device fault. The hypergravity 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, an auxiliary material feeding pipe I and an auxiliary material feeding pipe II. The technology comprises that a phosgene inert solution and a toluenediamine inert solution are collided by the unlimited impinging stream structure, and the mixture is fed into a rotating filler, 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 specifically relates to a Sichuan-shaped supergravity device and process for continuously preparing toluene diisocyanate. Background technique [0002] Toluene diisocyanate (TDI) is a kind of mixed isocyanate, and the mixture of 2,4-TDI and 2,6-TDI isomer mass ratio of 80:20 is commonly used in industry. 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. The production of TDI by phosgene method mainly includes five steps: (1) carbon monoxide and chlorine react to form phosgene; (2) toluene and nitric acid react to form Dinitrotoluene (DNT); (3) DNT reacts with hydrogen to form toluene diamine (TDA); (4) The treated dry TDA reacts with phosgene to form (TDI); (5) TDI purification. The phosgenation reaction of TDI production...

Claims

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Application Information

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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
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