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Phosgene treatment method and a method for producing TDI with phosgene

A treatment method, phosgene technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of isocyanic acid derivatives, etc., to achieve the effect of reducing the difficulty of system operation and stabilizing operation

Inactive Publication Date: 2010-09-29
蓝星化工有限责任公司
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  • Abstract
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Problems solved by technology

make the operation more stable

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  • Phosgene treatment method and a method for producing TDI with phosgene
  • Phosgene treatment method and a method for producing TDI with phosgene

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Embodiment Construction

[0011] Below in conjunction with figure, the present invention will be further described:

[0012] The schematic flow chart of the present invention is disclosed in Fig. 1, the temperature of fresh phosgene from the phosgene synthesis process is 65°C is passed into the cooler 1 to cool down to 45°C, and then enters the bottom of the phosgene absorption tower 2. The 30°C o-dichlorobenzene (ODCB) from the irrigation area is cooled to -10°C through cooler 3 (the coolant in cooler 3 is an aqueous solution of ethylene glycol from -15°C to -20°C) and enters phosgene absorption The upper part of the column, where gaseous phosgene is dissolved in o-dichlorobenzene (ODCB). Then, the ortho-dichlorobenzene (ODCB) that has absorbed phosgene is sent to the phosgenation system through the pump 4 to perform phosgenation reaction to generate TDI.

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Abstract

The invention relates to a phosgene treatment method and a method for producing TDI with obtained phosgene. In the production TDI with the phosgene treated by the method, first the temperature of the phosgene GGG is reduced and then the phosgene GGG is added into a phosgene absorption tower, and then low-temperature ODCB is used for absorbing the phosgene; and the treated phosgene is used for producing TDI, so that the operation is more stable.

Description

technical field [0001] The invention relates to a method for processing phosgene and a method for producing TDI from the obtained phosgene. Background technique [0002] Toluene diisocyanate (TDI) is the most important diisocyanate, mainly used in the production of polyurethane (foam and rubber), but also in the production of polyimide, adhesives and coatings. The existing methods for producing TDI mainly include phosgene method and non-phosgene method. Among them, the common phosgene method is to directly pass fresh gaseous phosgene into the phosgenation reaction system, which will cause sudden changes in system pressure and unstable gas-liquid phase reaction, which is not conducive to safe and stable production. Contents of the invention [0003] In order to solve the existing problems, the present invention provides a treatment method for phosgene, by first cooling gaseous phosgene and then adding it to the phosgene absorption tower, so that the phosgene is dissolved i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C265/14C07C263/18C07C263/10
Inventor 张全喜赵晋林刘天佐崔建帮王旭丰任筱蓉
Owner 蓝星化工有限责任公司
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