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Reactor for preparing isocyanate and method of reactor for preparing isocyanate

A technology of isocyanate and reactor, which is applied in the field of isocyanate preparation reactor and its use in the preparation of isocyanate, can solve the problems of shortening the operation period of the reactor and deterioration of the flow field of the reactor, so as to improve the quality of the reaction liquid and avoid a large amount of heat release , Improve the effect of the operation cycle

Inactive Publication Date: 2015-09-02
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, in order to promote the complete reaction of amine and phosgene, an excess amount of phosgene is often used to react with amine, resulting in a high concentration of phosgene in the reactor. High, so that the phosgenation reaction is very violent, and a large amount of heat is released instantaneously, which leads to the generation of coke, which in turn leads to the gradual deterioration of the flow field in the reactor and shortens the operating period of the reactor.

Method used

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  • Reactor for preparing isocyanate and method of reactor for preparing isocyanate
  • Reactor for preparing isocyanate and method of reactor for preparing isocyanate
  • Reactor for preparing isocyanate and method of reactor for preparing isocyanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The reactor comprises an inner feed pipe 4, an outer feed pipe 5, a mixer housing 6, a neck expansion pipe 2, an auxiliary feed pipe 7 and a reaction pipe 3; the inner feed pipe 4, the outer feed pipe 5, The mixer housing 6 constitutes the mixer; the inner feed pipe 4 is arranged inside the mixer, the outer feed pipe 5 is communicated with the mixer through the side wall of the mixer, and the lower end of the mixer is passed through a neck expansion tube 2 is connected to the reaction tube 3, and makes the diameter d of the reaction tube larger than the diameter d3 of the mixer shell, and the auxiliary feed tube 7 is arranged on the side wall of the expansion neck tube 2. The expansion neck is in the shape of a frustum of a cone.

[0046] The diameter d of the reaction tube of the reactor used is 450mm, the diameter d3 of the mixer shell is three times the diameter d1 of the inner feed pipe, the diameter d1 of the inner feed pipe is twice the diameter d2 of the outlet, ...

Embodiment 2

[0054] The diameter d of the reaction tube is 600mm, the diameter d3 of the mixer shell of the reactor used is three times the diameter d1 of the inner feed pipe, the diameter d1 of the inner feed pipe is twice the diameter d2 of the outlet, and the outlet of the inner feed pipe The distance h from the upper bottom surface of the neck expansion tube is twice the inner diameter d1 of the feed pipe, the diameter d of the lower bottom surface of the neck expansion tube is 1.5 times the diameter d3 of the upper bottom surface, and the angle between the busbar 10 of the neck expansion tube and the axis of the reactor α is 30°.

[0055] The neck expander top view of the reactor adopted in embodiment 2 is shown in image 3 . Among them, 8: the round edge of the upper bottom surface of the neck expansion tube, 9: the round edge of the bottom surface of the neck expansion tube, 10: the bus bar of the neck expansion tube, 11: the round edge of the section where the outlet of the auxili...

Embodiment 3

[0063] The diameter d of the reaction tube is 450mm, the diameter d3 of the mixer shell of the reactor used is three times the diameter d1 of the inner feed pipe, the diameter d1 of the inner feed pipe is twice the diameter d2 of the outlet, and the outlet of the inner feed pipe The distance h from the upper bottom surface of the neck expansion tube is twice the inner diameter d1 of the feed pipe, the diameter d of the lower bottom surface of the neck expansion tube is 1.5 times the diameter d3 of the upper bottom surface, and the angle α between the busbar of the neck expansion tube and the reactor axis is 45°.

[0064] A total of 8 auxiliary feed pipes are evenly distributed on the two sections, and the outlets of the 4 auxiliary feed pipes are evenly distributed on the round edge of the first section parallel to the bottom surface of the neck expansion tube. The distance from the bottom surface is 1 / 3H; the outlets of the other 4 auxiliary feed pipes are evenly distributed ...

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Abstract

The invention provides a reactor for preparing isocyanate and a method of the reactor for preparing isocyanate. The reactor comprises an inner feeding pipe, an outer feeding pipe, a mixer shell, a neck expanding pipe, an auxiliary feeding pipe and a reaction tube, wherein phosgene enters the reactor from the outer feeding pipe and the auxiliary feeding pipe. A coking material in a phosgenation reaction process can be effectively reduced; the running period of the reactor is improved; the conversion rate of the reaction process is improved; and the purity of a reaction liquid is improved.

Description

technical field [0001] The object of the present invention is to provide a reactor for preparing isocyanate and a method for preparing isocyanate. Background technique [0002] The gas-phase phosgenation reaction of phosgene and amine to prepare isocyanate is usually carried out in a tubular reactor, which has the characteristics of fast reaction rate and low phosgene retention, but if the mixing is improper, such as slow mixing, more Polymerization by-products, these by-products coke and agglomerate in the reactor wall, and eventually block the reactor. [0003] European patent EP1319655 discloses a method for preparing isocyanates by heating the corresponding amine and phosgene to 200-600°C respectively, passing them through a static mixer, wherein the gaseous reactants flow through parallel reactors, and the Amine was fed to the reactor through a nozzle in the mixer and phosgene was fed to the reactor through the annular gap around the nozzle. This method attempts to av...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00C07C265/14C07C263/10
Inventor 俞勇尚永华孙中平李建峰王鹏黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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