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Single reflection hypergravity device and process for continuous preparation of toluene diisocyanate

A toluene diisocyanate and supergravity technology, applied in the field of single reflection supergravity devices, can solve the problems of poor reaction selectivity, decreased conversion rate, large difference in material volume flow ratio, etc., to avoid clogging and prevent urea substances. generated effect

Active Publication Date: 2015-03-11
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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  • Single reflection hypergravity device and process for continuous preparation of toluene diisocyanate
  • Single reflection hypergravity device and process for continuous preparation of toluene diisocyanate
  • Single reflection hypergravity device and process for continuous preparation of toluene diisocyanate

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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, 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 The reactor is used for the reaction, and adopts a rotating packed bed type supergravity structure, and the filler is a wire mesh filler; the diameter of the casing is d 2 is 200mm, casing diameter d 2 and main feed pipe diameter d 3 With a ratio of 2, the diameter of the main feed pipe d 3 100mm; casing length L 1 with casing diameter d 2 The ratio is 10, the casing length L 1 is 20...

Embodiment 2

[0070] 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 150 ° C, the mass fraction is 10%, and the mass flow The rate is 9000kg / h; the temperature of the phosgene inert solvent solution is 110°C, the mass fraction concentration of phosgene is 50%, and the mass flow rate is 9500kg / h. Phosgene and toluene diamine inert solution have an approximate volume flow ratio of 1:1, and enter the cold reactor for reaction, adopting a stator-rotor type supergravity structure, and the filler is metal foam filler; the diameter of the casing is d 2 is 200mm, casing diameter d 2 and main feed pipe diameter d 3 With a ratio of 10, the diameter of the main feed pipe d 3 20mm; casing length L 1 with casing diameter d 2 The ratio is 1, the casing length L 1 is 200mm; the inner d...

Embodiment 3

[0073] In a TDI manufacturer, the process and device of the present invention are used to carry out a pilot test, specifically as follows with o-dichlorobenzene light solvent as an inert solvent, the temperature of the configured toluene diamine inert solvent solution is 140 ° C, the mass fraction is 40%, and the mass flow rate is 3020kg / h; the temperature of the phosgene inert solvent solution is 100°C, the mass fraction concentration of phosgene is 30%, and the mass flow rate is 10820kg / h. The volume flow ratio of phosgene and toluene diamine inert solution is approximately 3:1, enter the cold reactor for reaction, adopt spiral channel type supergravity structure, and the filler is metal foam filler; its characteristic is that the diameter of the sleeve is d 2 150mm, casing diameter d 2 and main feed pipe diameter d 3 With a ratio of 3, the diameter of the main feed pipe d 3 50mm; casing length L 1 with casing diameter d 2 Ratio is 2, sleeve length L 1 is 300mm; the inn...

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Abstract

The invention belongs to the technical field of toluene diisocyanate production, in particular relates to a single reflection hypergravity device and process for continuous preparation of toluene diisocyanate, and solves the problems of poor reaction selectivity, decreased conversion rate and possible reaction device fault under large flow volume ratio differences of materials in the existing production process of toluene diisocyanate. The hypergravity device includes a cold reactor and a heat reactor; the cold reactor comprises a non-limitative impinging stream structure and a hypergravity structure, and the non-restrictive impinging stream structure comprises a main feeding pipe and a casing pipe in different diameters and baffle plates. The process is as below: flowing a phosgene inert solvent solution and a toluenediamine inert solvent solution into the non-restrictive impinging stream structure, then following into a rotation packing, then flowing into the heat reactor, and reacting to generate a TDI crude product. According to the invention, toluenediamine almost reacts completely, so s to prevent generation of urea materials, effectively avoid plugging of the pipeline and reactor, and improve the production efficiency of toluene diisocyanate.

Description

technical field [0001] The invention belongs to the technical field of toluene diisocyanate (TDI) production, and specifically relates to a single-reflection hypergravity 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 form toluene diamine (TDA); (4) Treated dry TDA reacts with phosgene to form (TDI); (5) Purification of TDI. The phosgenati...

Claims

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Application Information

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IPC IPC(8): C07C265/14C07C263/10B01J19/26
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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