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Organic amine phosgenation reactor and process

A technology for reactors and organic amines, applied in the field of organic amine phosgenation reactors and processes, to achieve the effects of solving solid problems, significant economic benefits, and easy regulation

Pending Publication Date: 2021-03-16
上海巽田科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method controls the process of phosgenation reaction in stages, improves the phosgenation rate of organic amines while suppressing side reactions as much as possible, and also takes corresponding measures for the generated solids, so as to solve the problem of blockage

Method used

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  • Organic amine phosgenation reactor and process
  • Organic amine phosgenation reactor and process

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preparation example Construction

[0082] Refer below figure 1 Specific description according to the specific mode of operation of the preparation process of the present disclosure:

[0083] 1) The prepared organic amine solution has a mass concentration of 10-70%, preferably 20-50%, and after heat exchange, the feed temperature is 0-65°C, and is sprayed downwards into the reactor from the feed atomizing nozzle 1, The spraying angle is 20-160°, preferably 40-120°, more preferably 60-100°. The sprayed liquid mist is in the shape of a solid cone and is evenly distributed in the cross section of the reactor. The droplet size is 10-400 μm, preferably 10-200 μm, more preferably 20-100 μm;

[0084] 2) Passing phosgene through the cold phosgene tube 4, the molar ratio of phosgene to organic amine is 2-15, preferably 3-6, and the phosgene inlet temperature is -10-65°C. In the reactor, phosgene and the organic amine solution liquid mist in the step 1) come into reverse contact reaction to form formyl chloride and ami...

Embodiment 1

[0101] 1) The mass concentration of the chlorobenzene solution of toluene diamine (TDA) is 17%, the feed flow rate is 40kg / h, and the feed temperature is 50°C. It is sprayed into the reactor interior by the feed atomizing nozzle 1, and the spray angle is 60°. uniformly distributed across the reactor cross-section.

[0102] 2) Phosgene is fed into the cold phosgene pipe 4, the flow rate is about 35kg / h, and the inlet temperature is 20°C. In the reactor, the phosgene and the mist of the amine solution come into reverse contact, react rapidly and release heat, and the temperature of the cold phosgenation reaction section is about 90°C.

[0103] 3) The secondary phosgene feed pipe 5 is fed with phosgene, the flow rate is about 33kg / h, and the inlet temperature is 20°C. , step 2) in the droplet falling in the high temperature reverse further phosgenation reaction, this section is called high temperature phosgenation reaction section, the main reaction is phosgenation of amine hydr...

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Abstract

The invention relates to an organic amine phosgenation reactor and process. The reactor mainly comprises a feeding atomizing nozzle 1, a gas outlet 2, first and second wall flow ring pipes 3, a cold phosgene feeding pipe 4, a secondary phosgene feeding pipe 5, first and second cooling nozzles 6, an overflow pipe 7, a flushing pipe 8, a bottom outlet 9, first and second gate valves 10, and a transfer hopper 11. The reactor has no internal component with a complex structure and is easy to process and manufacture; requirements on high-pressure phosgenation reaction and low-pressure phosgenation reaction can be met, and regulation and control are easy; and the solid problem of phosgenation reaction is effectively solved, long-time continuous operation is safe and reliable, and economic benefits are remarkable.

Description

technical field [0001] The disclosure relates to the technical field of preparing related downstream products by phosgenation of organic amines, and in particular to an organic amine phosgenation reactor and process. Background technique [0002] Phosgenation reactors are mainly used in the production and synthesis of isocyanates. At present, the phosgenation production technology used in industry mainly includes gas phase phosgenation and liquid phase phosgenation. [0003] The gas-phase phosgenation method is a method in which some gasifiable amine compounds are gasified at 200-600°C, and then directly mixed with phosgene for gas-phase reaction. This method was originally created by Bayer Company in Germany, with a yield of over 98%. It is suitable for the phosgenation of amine compounds with low boiling point and high activity. At present, it has become the mainstream production technology of aliphatic isocyanate. However, gas-phase phosgenation has very high requiremen...

Claims

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Application Information

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IPC IPC(8): B01J19/24B01J4/00B01J10/00B01J19/00C07C263/10C07C265/14
CPCB01J4/002B01J10/00B01J19/0006B01J19/0053B01J19/24B01J2204/002C07C263/10C07C269/00C07C265/14C07C271/04
Inventor 牟新东高鹍李慧
Owner 上海巽田科技股份有限公司
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