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Method for continuously producing organic isocyanate

An isocyanate and organic technology, applied in the field of continuous preparation of organic isocyanates, can solve the problems of high phosgene excess, large solvent circulation, easy blocking of equipment, etc., and achieve the effects of reducing side reactions, reducing energy consumption, and reducing abnormal retention.

Active Publication Date: 2013-02-27
SEDIN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The object of the present invention is to overcome the deficiencies in the prior art of phosgene leakage, easy blockage of equipment by solid objects, large amount of solvent circulation or high excess of phosgene, and to provide a phosgene that has good sealing performance and is not prone to solid blockage, A continuous production method of organic isocyanate with reduced solvent circulation and reduced excess of phosgene

Method used

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  • Method for continuously producing organic isocyanate
  • Method for continuously producing organic isocyanate

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Embodiment 1

[0027] Embodiment 1 (this embodiment only illustrates a kind of concrete situation that the present invention implements and does not limit the present invention.)

[0028] A continuous preparation method of organic isocyanates, comprising the steps of:

[0029] (1) Prepare an impingement flow reactor and a static mixer, the impingement flow reactor includes an outer cylinder 1, three feed nozzles 2 are arranged on the top wall of the outer cylinder along the ring direction, and the discharge port 3 is arranged on the bottom of the outer cylinder;

[0030] (2) According to the molar ratio of amino group and phosgene contained in m-toluenediamine is 1: 3, m-toluenediamine and phosgene are respectively dissolved in o-dichlorobenzene, and mass concentration is 20% m-toluenediamine / The solution B of o-dichlorobenzene is fed into the outer cylinder through a feeding nozzle at a liquid velocity of 10-12m / s, and the phosgene / o-dichlorobenzene solution A with a mass concentration of ...

Embodiment 2

[0037] A continuous preparation method of organic isocyanates, comprising the steps of:

[0038] (1) Prepare an impingement flow reactor and a static mixer, the impingement flow reactor includes an outer cylinder, a central feed nozzle and two peripheral feed nozzles are arranged on the top wall of the outer cylinder, and the discharge port is arranged on the outer cylinder bottom of;

[0039] (2) According to the molar ratio of the amino group and phosgene contained in the organic primary amine 1,6-hexamethylenediamine (HDA) is 1:1, the organic primary amine and phosgene are respectively dissolved in chlorobenzene, and the mass concentration is 10%. The organic primary amine solution is added into the outer cylinder of the impingement flow reactor through the central feeding nozzle, and the solution with a mass concentration of 50% phosgene is added into the outer cylinder of the impinging flow reactor through the peripheral feeding nozzle, at an absolute pressure of 2.3 to 2...

Embodiment 3

[0045] A continuous preparation method of organic isocyanates, comprising the steps of:

[0046] (1) Prepare an impingement flow reactor and a static mixer, the impingement flow reactor includes an outer cylinder, two feed nozzles are arranged on the top of the side wall of the outer cylinder, and the discharge port is arranged on the bottom of the outer cylinder;

[0047] (2) according to organic primary amine 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane (IPDA), the molar ratio of amino group and phosgene is 1:8, organic primary Amine and phosgene were respectively dissolved in p-dichlorobenzene, a solution of 30% organic primary amine with a mass concentration was added into the outer cylinder of the impinging flow reactor through a feeding nozzle, and a solution of phosgene with a mass concentration of 20% was passed through another feed nozzle. The material nozzle is put into the outer cylinder of the impingement flow reactor, and the phosgenation reaction is carried o...

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Abstract

The invention discloses a method for continuously preparing organic isocyanate. The method comprises the steps of: preparing an impinging stream reactor and a static mixer, wherein the impinging stream reactor comprises an outer cylinder, feed nozzles are arranged on the upper part of the outer cylinder, and a discharge outlet is arranged on the bottom of the outer cylinder; dissolving organic primary amine and phosgene into the same inert organic solvent respectively, adding the obtained solution into the outer cylinder through the feed nozzles for a phosgenation reaction, and ensuring that the average retention time of materials does not exceed 30s; and introducing the material discharged from the discharge outlet of the impinging stream reactor from a feed inlet of the static mixer provided with a heat exchange device for a reaction to generate a crude product of the organic isocyanate, wherein the average retention time of the material is less than 30min. The method of the invention utilizes good micromixing property of the impinging stream reactor to improve the mixing efficiency of raw materials, reduce the production cost of isocyanate and improve the production capacity of the isocyanate. The reactor of the invention has a simple structure, reduces the danger of solid blockage, is easy to seal, and reduces the danger of phosgene leakage.

Description

technical field [0001] The invention relates to a method for continuously preparing organic isocyanates by utilizing liquid-phase phosgenation of primary amines. Background technique [0002] Impinging Streams (IS) is the high-speed impact of two or more fluids in a certain way, which is an important method to achieve rapid mixing. Due to the special flow structure of the impingement, impinging flow is very effective in promoting micro-mixing. The research results show that the pressure fluctuation in the impinging flow of the liquid continuous phase is one of the important reasons for effectively promoting micro-mixing, and it is also conducive to promoting the process dynamics (for details, please refer to "Impinging Flow—Principles, Properties, and Applications", The first edition in 2006, Chapter 11, pages 175-185, Wu Yuan, Chemical Industry Press). Impinging flow reactors with different structures have shown excellent performance in different liquid phase reactions, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C263/10C07C265/14
Inventor 闫少伟李韡杨在建徐双庆陆宏玮张金利崔晓曦韩优杨锦
Owner SEDIN ENG
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