Reactor and method for preparing isocyanate

An isocyanate and reactor technology, which is applied to the reactor and field for preparing isocyanate, can solve the problems of long length, increased investment in device construction, difficulty, etc., and achieves the effects of reducing overall length, reducing investment and increasing operability

Inactive Publication Date: 2010-11-10
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the tubular reactor in the industrialized device has a very long length, even if adopting the plate reactor described in EP01451150A, it cannot be avoided, which leads to the increase of device construction investment and the difficulty in actual operation

Method used

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  • Reactor and method for preparing isocyanate
  • Reactor and method for preparing isocyanate

Examples

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Embodiment 1

[0034] Using the same central jet mixer, variable diameter connection element and single circular tube reactor as in Comparative Example 2, the structured packing of silicon carbide was added in the tube reactor to increase the mass transfer and heat transfer in the reaction process Effect. The silicon carbide structured packing is customized by the Shenyang Metal Research Institute of the Chinese Academy of Sciences. It is placed from the lower end of the variable diameter connection element. Two sections of silicon carbide structured packing are arranged in the tubular reactor, and each section is fixed by a grid support plate. Each section of the packing The length is 2m, and the distance between two sections of filler is 0.6m.

[0035] At 320°C, the mixed gas of 2,4-toluenediamine and 2,6-toluenediamine with a mass ratio of 80:20 was mixed and diluted with o-dichlorobenzene, and o-dichlorobenzene (ODCB) and diamine The molar ratio is 3:1. The diluted diamine mixed gas an...

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Abstract

The invention relates to a reactor for preparing isocyanate in a gas phase, which comprises a mixer and a tubular reactor, wherein a 5 to 45 variable-diameter connecting element is arranged between the mixer and the tubular reactor; an internal member is arranged in the tubular reactor. The invention also discloses a method for preparing isocyanate by using the reactor, which comprises the following steps: diluting primary amine with an inert gas or vapor of an inert solvent, and mixing and reacting the mixed gas of diluted primary amine with phosgene in the mixer; and allowing the obtained reaction product to flow into the tubular reactor from the mixer and the variable-diameter connecting element of the tubular reactor to undergo a further reaction, and cooling and absorbing the product of the reaction to obtain an isocyanate product. When the reactor provided by the invention is adopted, the length of the tubular reactor is reduced by arranging the variable-diameter connecting element between the mixer and the tubular reactor; and as the internal member is arranged in the tubular reactor, the reaction effect in the reactor is improved and the product yield is improved.

Description

technical field [0001] The invention relates to a reactor for preparing isocyanates in the gas phase and a process for preparing isocyanates by means of the reactor. Background technique [0002] Gas-phase preparation of isocyanate refers to the method of generating isocyanate by reacting primary amine and phosgene in gas phase. European patent EP0593334A describes a method for the preparation of aromatic isocyanates in the gas phase. The tubular reactor used in this method does not include any dynamic rotation device, and only the shrinkage of the reactor wall is used to increase the disturbance. The mixing effect is poor compared to the mixing effect, and this poor mixing will lead to the formation of undesired solid products. [0003] European patent EP0699657A describes a method for the preparation of aromatic isocyanate in the gas phase. The reaction of aromatic diamine and phosgene is carried out in a mixed reactor. The reactor is divided into two areas, the inner are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J12/00C07C263/10C07C265/00
Inventor 罗务习薛永和于天杰张颜涛孙中平石滨尚永华华卫琦
Owner WANHUA CHEM GRP CO LTD
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