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Method for producing light colored dicyclohexyl methane diisocyanate

A technology for dicyclohexylmethane and diisocyanate is applied in the field of preparing light-colored dicyclohexylmethane diisocyanate and can solve problems such as unfavorable downstream applications

Active Publication Date: 2014-11-05
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various reasons such as raw material composition, preparation process and post-treatment (such as removal of solvent, separation of monomers), H 12 MDI monomer; this is not good for downstream applications

Method used

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  • Method for producing light colored dicyclohexyl methane diisocyanate
  • Method for producing light colored dicyclohexyl methane diisocyanate
  • Method for producing light colored dicyclohexyl methane diisocyanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: gas phase method prepares dicyclohexylmethane diisocyanate

[0048] The alcohol compound content is 0.05wt% H 12 MDA is gasified and heated to 355°C, mixed with nitrogen at 300°C, and gaseous phosgene heated to 355°C is continuously fed into the reactor through the respective feed pipes, under the conditions of absolute pressure 0.05MPa and temperature 360°C react below. where H 12 The feeding amount of MDA is 100Kg / h, and the feeding amount of phosgene is 300Kg / h. After the reaction, the mixed gas is rapidly cooled to 100°C-140°C with o-dichlorobenzene solution through a gas jet absorption device to obtain the product containing H 12 MDI actinic liquid, after further dephosgene, HCl, desolventization and distillation processes, pure H can be obtained 12 MDI products.

[0049] Embodiment 2-4 gas phase phosgenation reaction is carried out under the same conditions with embodiment 1, and difference is only that H 12 The content of alcohol compounds in ...

Embodiment 5

[0054] Embodiment 5: Preparation of dicyclohexylmethane diisocyanate by liquid phase method

[0055] The alcohol compound content is 0.05wt% H 12 MDA is configured into a 15% solution with chlorobenzene as a solvent, and is preheated to 40°C, and simultaneously passed into a reaction kettle containing chlorobenzene with liquid phosgene at -5°C for liquid-phase phosgenation reaction, wherein H 12 The feeding amount of MDA is 100Kg / h, the feeding amount of cold reaction phosgene is 1000kg / h, the cold reaction temperature is controlled at 60°C, and the residence time is 5min, and the thermal reaction temperature is controlled at 140°C, and the residence time is 2h, to obtain Contains product H 12 MDI actinic liquid, after further dephosgene, HCl, desolventization and distillation processes, pure H can be obtained 12 MDI products.

[0056] Embodiment 6-8 liquid phase phosgenation reaction is carried out under the same conditions, and the difference is only that H 12 The conten...

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Abstract

The invention relates to a method for producing a light colored or colorless dicyclohexyl methane diisocyanate (H12MDI). The method comprises: a) purifying dicyclohexylmethane diamine (H12MDA) as raw material to obtain an H12MDA containing an alcohol compound of 0.2 wt% or less; and b) carrying out phosgenation of the H12MDA containing the alcohol compound of 0.2 wt% or less to obtain the H12MDI. The H12MDI produced by the method has the characteristics of light color or colorlessness.

Description

technical field [0001] The invention relates to a method for preparing light-colored dicyclohexylmethane diisocyanate. Background technique [0002] Dicyclohexylmethane diisocyanate (H 12 MDI) is obtained through dicyclohexylmethanediamine (H 12 MDA) prepared by the phosgenation reaction. However, due to various reasons such as raw material composition, preparation process and post-treatment (such as removal of solvent, separation of monomers), H 12 MDI monomer; this is not good for downstream applications. [0003] lead to H 12 There are many reasons for the coloration of MDI monomers, and different methods are needed to avoid them. [0004] US5364958 introduces a method for preparing isocyanate, using hot HCl gas to heat-treat the reaction liquid after removing phosgene, so as to achieve the purpose of reducing the color number of the product. [0005] EP0581100 also proposes a method for preparing light-colored isocyanate, that is, adding a chemical reducing agent t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C265/10C07C263/10
Inventor 尚永华俞勇孙中平李同和华卫琦王占友张颜涛丁建生
Owner WANHUA CHEM GRP CO LTD