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Method for continuously preparing pentamethylene diisocyanate

A technology of pentamethylene diisocyanate and o-dichlorobenzene, which is applied in the field of continuous preparation of pentamethylene diisocyanate by phosgene method, can solve the problems of no large-scale industrial production, low yield, many side reactions, etc., and achieve The effect of avoiding tar generation, increasing product yield, and reducing the formation of by-products

Inactive Publication Date: 2022-02-01
甘肃银光聚银化工有限公司
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Problems solved by technology

[0003] There are two synthetic methods of PDI, phosgene method and non-phosgene method. The phosgene method has one-step phosgene method and two-step phosgene method. In the past, one-step high-temperature phosgene method was used, with many side reactions and low yield. It has been developed into the two-step phosgenation reaction currently used, that is, first luminescence (0-70°C), and then thermo-actinization (80-200°C); the non-phosgene method is currently only a small-scale synthesis, and there is no large-scale industrial production. In the stage of technology development, the phosgene method is still a mature process route for the synthesis of M-XDI

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  • Method for continuously preparing pentamethylene diisocyanate
  • Method for continuously preparing pentamethylene diisocyanate
  • Method for continuously preparing pentamethylene diisocyanate

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Embodiment Construction

[0025] The following examples serve to further illustrate the method of the present invention. The spirit and scope of the present invention disclosed above are not limited by these examples.

[0026]

[0027] Operational steps according to the above conditions include:

[0028] a. Vaporize liquid phosgene, and the pressure of phosgene reaches 0.10-0.12MPa;

[0029] b. Operate the refrigerant and heat medium systems, so that the return temperature of the refrigerant is controlled at -10-10°C, and the return temperature of the heat medium is controlled at 140-180°C;

[0030] c. Put 100~500Kg of pentamethylenediamine and o-dichlorobenzene together for dehydration and put it to the 80% liquid level in the dehydration pentamethylenediamine solution tank 1, and put the dehydrated o-dichlorobenzene into the 80% liquid level in the dehydration solvent tank 2. According to the liquid level, according to the ratio of amine and solvent 1:15~20, put into the cold photochemical kettl...

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Abstract

The invention relates to a method for continuously preparing pentamethylene diisocyanate. The method is characterized in that pentamethylene diisocyanate is synthesized by a low-temperature and high-temperature two-step phosgenation method. In order to increase the condensation recovery rate and the reutilization rate of phosgene, frozen chlorobenzene is used as a refrigerant for partial condensers; in order to further improve the recovery rate of phosgene in the tail gas and reduce the treatment capacity of a tail gas destroying tower, a phosgene recovery tank is additionally arranged, the phosgene in the tail gas is condensed and recovered, and frozen chlorobenzene is introduced into a jacket to cool a solvent in the tank, so the recovery amount of phosgene is increased; and the formation of byproducts is effectively reduced, and product yield is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to production equipment and a method for continuously preparing pentamethylene diisocyanate by a phosgene method. Background technique [0002] 1,5-pentamethylene diisocyanate (PDI), also known as pentamethylene diisocyanate, belongs to a new type of aliphatic diisocyanate, and its products and related derivatives have excellent properties. [0003] There are two synthetic methods of PDI, phosgene method and non-phosgene method. The phosgene method has one-step phosgene method and two-step phosgene method. In the past, one-step high-temperature phosgene method was used, with many side reactions and low yield. It has been developed into the two-step phosgenation reaction currently used, that is, first luminescence (0-70°C), and then thermo-actinization (80-200°C); the non-phosgene method is currently only a small-scale synthesis, and there is no large-scale industrial pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/10C07C263/20C07C265/14
CPCC07C263/10C07C263/20C07C265/14
Inventor 白卫兵王进军刘耀宗滕志君蒙鸿飞杨英朝杨玉宁
Owner 甘肃银光聚银化工有限公司
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