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
View PDF7 Cites 7 Cited by
  • 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 d

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0065] Example 1:

[0066] In a TDI manufacturer, the process and device of the present invention are used to carry out a pilot test. Specifically, the light solvent of o-dichlorobenzene is used as the inert solvent, and the temperature of the inert solvent solution of toluene diamine is 110° C., the mass fraction is 40%, and the mass flow rate is 110°C. is 1000Kg / h; the temperature of the phosgene inert solvent solution is 70°C, the mass fraction concentration of phosgene is 20%, the mass flow rate is 15240kg / h, and the volume flow ratio of phosgene and toluenediamine inert solution is approximately 15:1. The reactor reacts with a rotating packed bed type supergravity structure, and the packing is a wire mesh packing; the diameter of the casing is d 2 200mm, casing diameter d 2 with the main feed pipe diameter d 3 With a ratio of 2, the diameter of the main feed pipe is d 3 100mm; sleeve length L 1 with casing diameter d 2 The ratio is 10, the sleeve length L 1 is 2000...

Example Embodiment

[0069] Embodiment 2:

[0070] In a TDI manufacturer, the process and device of the present invention were used to carry out a pilot test. Specifically, the light solvent of o-dichlorobenzene was used as the inert solvent. The temperature of the phosgene inert solvent solution is 110℃, the mass fraction concentration of phosgene is 50%, and the mass flow rate is 9500kg / h. The approximate volume flow ratio of phosgene and toluenediamine inert solution is 1:1, and it enters the cold reactor for reaction. It adopts a stator-rotor type supergravity structure, and the filler is metal foam filler; the diameter of the casing is d 2 200mm, casing diameter d 2 with the main feed pipe diameter d 3 With a ratio of 10, the diameter of the main feed pipe is d 3 20mm; sleeve length L 1 with casing diameter d 2 The ratio is 1, the sleeve length L 1 is 200mm; the inner diameter d of the main feeding pipe 3 and nozzle outlet hole diameter D 2 The ratio is 1, and the diameter of the nozz...

Example Embodiment

[0072] Embodiment three:

[0073] In a TDI manufacturer, the process and device of the present invention are used to carry out a pilot test. Specifically, the light solvent of o-dichlorobenzene is used as the inert solvent. The temperature of the inert solvent solution of toluenediamine is 140°C, the mass fraction is 40%, and the mass flow rate is 140°C. is 3020kg / h; the temperature of the phosgene inert solvent solution is 100℃, the mass fraction concentration of phosgene is 30%, and the mass flow rate is 10820kg / h. The volume flow ratio of phosgene and toluenediamine inert solution is approximately 3:1, and the reaction is carried out in the cold reactor, using a spiral channel type supergravity structure, and the filler is a metal foam filler; it is characterized in that the diameter of the casing is d 2 150mm, casing diameter d 2 with the main feed pipe diameter d 3 With a ratio of 3, the diameter of the main feed pipe is d 3 50mm; sleeve length L 1 with casing diamete...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap