Method for preparing high-content 1,3-bis(isocyanatomethyl)benzene

A technology for iso-xylylene isocyanate and meta-xylylene amine is applied in the field of preparing high-content iso-xylylene isocyanate, can solve problems such as inapplicability, and achieve shortened reaction time and production safety. The effect of high and low equipment investment

Inactive Publication Date: 2018-10-16
JIANGSU KUAIDA AGROCHEM
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  • Abstract
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Problems solved by technology

And m-xylylene amine is a high boiling point amine, so this method is not applicable

Method used

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  • Method for preparing high-content 1,3-bis(isocyanatomethyl)benzene

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Embodiment Construction

[0024] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0025] A. In a 50L reaction vessel with a Y-shaped reactor, circulation pump, cooler, heater, phosgene tail gas absorption processor, thermometer, pressure gauge and stirring, add 15L of o-dichlorobenzene, m-phthalylene Base amine 1500g. Turn on the circulating pump to circulate the o-dichlorobenzene of m-xylylene amine at a rate of 25L / min, and at the same time, pass in carbon dioxide at a rate of about 5L / min through another port of the Y-shaped reactor for 5 hours Afterwards, the measured pH value was 6. End with carbon dioxide. The temperature was raised to 60°C. Begin to flow phosgene at a speed of 2500ml / min, and gradually raise the temperature to 125°C, and flow back phosgene to...

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Abstract

The invention discloses a method for preparing high-content 1,3-bis(isocyanatomethyl)benzene. M-xylylenediamine is used as a raw material, and under the presence of a solvent, the m-xylylenediamine and carbon dioxide are subjected to pressurization for salt forming reaction to prepare amido formate; the amido formate is reacted with phosgene to prepare the 1,3-bis(isocyanatomethyl)benzene; a method of combining cryogenic crystallization and high vacuum distillation is adopted for the 1,3-bis(isocyanatomethyl)benzene, and then the high-purity 1,3-bis(isocyanatomethyl)benzene is obtained. According to the method, the technology is green and environmentally friendly, and no large quantity of waste acid is produced; a liquid-phase salt-forming phosgenation method is adopted, so that generationof a by-product urea is avoided; a method of low-temperature crystallization and then distillation is adopted, so that the phenomenon that a high-temperature continuous rectification method is adopted to cause polymerization, and thus the product content is reduced is avoided; according to the technology, three wastes are fewer, the product content is high, the yield is high, and the economic andsocial benefits of the method are significant.

Description

technical field [0001] The invention relates to the technical field of new chemical materials, in particular to a method for preparing high-content m-phthalylene isocyanate. Background technique [0002] M-phthalylene isocyanate (XDI for short) is an aliphatic isocyanate, which is mainly used in various high-grade anti-yellowing coatings, high-grade polyurethane elastomers, polyurethane leather and adhesives, and is also widely used in high-grade polyurethane Optical lens industry. XDI belongs to the field of high-grade polyurethane new materials. The global market demand is about 2000-3000 tons / year, and the domestic demand is about 200-300 tons / year. In recent years, the field of polyurethane has continued to expand. In addition to traditional polyurethane insulation systems, adhesives, and coatings, it has also penetrated into many fields such as high-speed rail, aviation, solar energy, wind energy, electric energy, and elastomers. In the next five years, the domestic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C265/14C07C263/12C07C263/20C07C269/00C07C271/02C07C271/04
CPCC07C263/12C07C263/20C07C269/00C07C271/02C07C271/04C07C265/14
Inventor 钱圣利韩邦友李炜周钱军符建平许雪飞陆丹丹李强孙益峰
Owner JIANGSU KUAIDA AGROCHEM
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