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Separation device and method for tar powder in TDI recovery liquid

A separation device and recovery liquid technology, applied in separation methods, chemical instruments and methods, purification/separation of isocyanic acid derivatives, etc., can solve treatment equipment pollution, reduce the content of chlorine-containing group compounds, and reduce the corrosion rate of purified TDI problems such as high recovery rate, good stability, and avoiding the risk of evaporation to dryness

Pending Publication Date: 2022-05-13
WANHUA CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a separation device and separation method for tar powder in TDI recovery liquid, to solve the problem that tar powder is entrained in the TDI recovery liquid obtained after the TDI distillation raffinate is processed by drying equipment, and causes treatment equipment pollution in the purification stage, And after being treated by this method, the content of compounds containing chlorine groups in the TDI solution is reduced, reducing the corrosion rate in the equipment used to purify TDI

Method used

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  • Separation device and method for tar powder in TDI recovery liquid
  • Separation device and method for tar powder in TDI recovery liquid
  • Separation device and method for tar powder in TDI recovery liquid

Examples

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Embodiment 1

[0045] Obtain the TDI recovery liquid that contains tar powder as drying device by vacuum rake dryer, and according to such as figure 1 The separation process of the shown separation device separates and purifies the TDI recovery liquid, and the relevant equipment and logistics information are as follows in Tables 1 and 2:

[0046] Logistics information in Table 1 Example 1

[0047]

[0048] Equipment information in Table 2 Example 1

[0049]

[0050]

Embodiment 2

[0052] Obtain the TDI recovery liquid that contains tar powder as drying device by vacuum rake dryer, and according to such as figure 1 The separation process of the shown separation device separates and purifies the TDI recovery liquid, and the relevant equipment and logistics information are as follows in Tables 3 and 4:

[0053] Logistics information in the embodiment 2 of table 3

[0054]

[0055] Equipment information in Table 4 Example 2

[0056]

[0057]

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PUM

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Abstract

The invention relates to a separation device and method for tar powder in TDI recovery liquid. The separation device comprises evaporation equipment, a condenser, a gas-liquid separator, a first material returning pipe and a second material returning pipe. According to the invention, the TDI recovery liquid containing the tar powder is separated through the evaporation equipment, so that the TDI solution with higher purity and high recovery rate is obtained, the problem of pollution of tower internals in conventional treatment measures of the tar powder is also avoided, and the device has the advantages of continuous operation and good stability.

Description

technical field [0001] The invention belongs to the field of refining and purifying toluene diisocyanate, and in particular relates to a separation device and a separation method for tar powder in a recovery liquid of toluene diisocyanate. Background technique [0002] There is a yield loss in the industrial preparation of toluene diisocyanate (TDI), partly due to insufficient phosgenation of toluene diamine (TDA) or the presence of impurities to form TDI oligomers (containing carbodiimide groups and chlorine-containing groups) The compound of the group is mainly called tar), which reduces the productive rate of TDI, and another part is produced by TDI staying at a higher temperature for a longer period of time. In the TDI refining stage, the boiling point of this part of the tar product is higher than that of TDI, and it is difficult to completely separate TDI and tar through conventional distillation or rectification means. Poor fluidity can easily cause pipeline blockage...

Claims

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Application Information

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IPC IPC(8): B01D1/00B01D1/22B01D1/30B01D3/06B01D3/10C07C263/20C07C265/14
CPCB01D1/00B01D1/22B01D1/30B01D3/06B01D3/10C07C263/20C07C265/14
Inventor 魏立彬胡淼邓如雷黄舜尧庞俊卿陈雷吴雪峰
Owner WANHUA CHEM GRP
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