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A kind of method and device for strengthening separation in the preparation of isocyanate

An isocyanate and enhanced separation technology, which is applied in the purification/separation of isocyanate derivatives, chemical instruments and methods, preparation of isocyanate derivatives, etc., can solve the problems of difficult product concentration and separation, complex process routes, environmental pollution, etc., To achieve the effect of improving the reaction yield and the yield of the equipment, the equipment is simple, and the zero emission requirements are achieved

Active Publication Date: 2021-08-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems existing in the prior art, the present invention provides a method and device for strengthening separation in the preparation of isocyanate, the method overcomes the problems in the prior art such as serious environmental pollution, complex process route and difficulty in product concentration and separation, and improves the The reaction conversion rate and yield of non-phosgene to prepare isocyanate, and at the same time, it can better realize product separation, easy to integrate with existing industrial technology, and can realize recycling, environmentally friendly and pollution-free

Method used

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  • A kind of method and device for strengthening separation in the preparation of isocyanate
  • A kind of method and device for strengthening separation in the preparation of isocyanate
  • A kind of method and device for strengthening separation in the preparation of isocyanate

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Embodiment 1

[0078] This embodiment provides a device for strengthening separation in the preparation of isocyanates, such as figure 1 As shown, the device includes: a reaction device 1 and a separation device 2, the reaction device 1 is a reactor, and the separation device 2 is a rectification column.

[0079] The upper part of the reaction device 1 is provided with a reaction purge gas outlet 12 , and the reaction purge gas outlet 12 is connected to the bottom inlet 22 of the separation device 2 . The bottom of the reaction device 1 is provided with a first material outlet 13, and the first material outlet 13 is connected with a first stream pipeline 61 and a second stream pipeline 62, and the first stream pipeline 61 is connected to the separating device 2. The upper entrance 21 is connected. The first heat exchange device 3 is arranged on the first stream pipe 61 . The top of the separation device 2 is provided with a purge tail gas outlet 23 .

[0080] The top of the reaction devic...

Embodiment 2

[0083] This embodiment provides a device for strengthening separation in the preparation of isocyanate, which is the same as that of Embodiment 1 except that the second heat exchange device is not provided.

Embodiment 3

[0085] This embodiment provides a device for strengthening separation in the preparation of isocyanate. The device is the same as that of Embodiment 1 except that the separation device is a rectification tower and a packed column is arranged in the tower as a separation component.

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Abstract

The invention provides a method and device for strengthening separation in the preparation of isocyanate. The method includes the following steps: under the action of a catalyst, an organic solvent solution containing carbamate is thermally decomposed under the purge of a protective gas to obtain isocyanate-containing The first material and the reaction purge gas; the first material includes a first stream, and the first stream is countercurrently purged with the reaction purge gas after heat exchange to obtain a purge tail gas carrying by-products, The first stream after the countercurrent purging is circulated to thermal decomposition for reaction; the second stream extracts isocyanate products; the method significantly improves the yield and purity of isocyanate; The separation device is connected, and the first stream pipeline is connected to the upper inlet of the separation device, so that the separation of reaction and product can be realized at the same time with relatively low equipment cost, and the operating cost is low and the economic benefit is high.

Description

technical field [0001] The invention relates to the technical field of isocyanate preparation, in particular to the technical field of non-phosgene preparation of isocyanate, in particular to a method and device for strengthening separation in the preparation of isocyanate. Background technique [0002] Isocyanate is the main raw material for the production of polyurethane and is widely used in industries such as elastomers, coatings, plastics, pesticides and leather. At present, the demand for isocyanate is increasing year by year, so the application prospect of isocyanate is very broad. Isocyanate products on the market mainly include phenyl isocyanate (Phenyl Isocyanate, PI), diphenylmethane diisocyanate (Diphenyl Methane Diisocyanate, MDI), toluene diisocyanate (TDI) and hexamethylene diisocyanate (Hexamethylene Diisocyanate, HDI). )Wait. [0003] The production method of isocyanate is mainly phosgene method at present, discloses a kind of method for preparing isocyana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C263/10C07C263/20C07C265/14
CPCC07C263/10C07C263/20C07C265/14
Inventor 李会泉陈家强王利国贺鹏徐爽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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