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Method for the preparation of isocyanate by partially adiabatic phosgenation of the corresponding amine

A technology of isocyanate and phosgene, applied in chemical instruments and methods, preparation of isocyanic acid derivatives, preparation of organic compounds, etc., can solve problems such as undisclosed adiabatic reaction methods

Pending Publication Date: 2020-05-19
COVESTRO DEUTSCHLAND AG
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AI Technical Summary

Problems solved by technology

Therefore, in the application WO 2017 / 001320 A1 there is no disclosure of (a) the adiabatic reaction mode, (b) the separation of the gaseous and liquid phases formed therein, (c) the multistage depressurization of the separated liquid phase and (d) its isothermal The sequence of further reactions under the condition

Method used

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Effect test

Embodiment 1

[0078] Embodiment 1 (the present invention): The method of the present invention is used for the computer simulation of industrial scale production, two-stage decompression

[0079] In the MDI plant, 40.0 t / h of MDA at a temperature of 130°C was mixed with 94.5 t / h of MCB at a temperature of 52°C as solvent by means of a static mixer to produce a 30.0% MDA solution (step 1) ). Phosgene was mixed with MCB in a phosgene dissolution tank to obtain a 60.0% phosgene solution (step II)). Each hour, 106.7 tons of this phosgene solution at a temperature of 3.0°C passed through the heat exchanger and were thereby cooled to a temperature of -1°C. In a similar manner, 134.5 tons per hour of a 30% MDA solution at a temperature of 80.0°C passed through a heat exchanger and thereby cooled to a temperature of 60°C. The MDA solution and the phosgene solution thus tempered enter the dynamic mixer (step III)). The temperature at the outlet of the dynamic mixer was adjusted to 130°C.

[00...

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Abstract

The present invention relates to a process for preparing an isocyanate by reacting a primary amine with phosgene, comprising I) providing an amine solution, II) providing a phosgene solution, III) mixing the amine solution with the phosgene solution in a mixing unit, followed by IV) further conversion in an adiabatically operated reaction zone and the removing of the gas phase formed as a result of the chemical reaction in a separation zone, V) expanding the remaining liquid phase in two or three stages, VI) further conversion of the liquid phase remaining after the last expansion stage in anindirectly heated reaction zone and VII) isolating the isocyanate from the reaction solution obtained therein.

Description

technical field [0001] The present invention relates to a process for the preparation of isocyanates by reacting primary amines with phosgene, which comprises I) providing an amine solution, II) providing a phosgene solution, III) mixing the amine solution with the phosgene solution in a mixing unit, followed by IV) in Further reaction in the adiabatically operated reaction zone and separation of the gaseous phase formed as a result of the chemical reaction in the separation zone, V) depressurization of the remaining liquid phase in two to three stages, VI) depressurization of the last depressurization in an indirectly heated reaction zone Further reaction of the remaining liquid phase after the pressing stage and VII) separation of the isocyanate from the reaction solution obtained here. Background technique [0002] Isocyanates (1) are produced in large quantities and mainly serve as raw materials for the production of polyurethanes. They are generally prepared by reactin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/10C07C265/14
CPCC07C263/10C07C265/14
Inventor T.克瑙夫J.施普里瓦尔德A.希尔舍尔V.米歇尔D.瓦斯蒂安C.斯蒂芬斯
Owner COVESTRO DEUTSCHLAND AG
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