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Method of preparing diisocyanate composition and optical lens

A technology of diisocyanate and optical lens, applied in the field of preparing optical lens, can solve the problems of high toxicity of phosgene gas, increase of reactor pressure, and inability to smoothly perform stirring, etc.

Active Publication Date: 2021-06-08
SKC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the conventional phosgene method of synthesizing isocyanate, in the method of obtaining hydrochloride as an intermediate by reacting amine with hydrogen chloride gas, hydrochloride is produced as fine particles under atmospheric pressure, so that the agitation inside the reactor cannot be performed smoothly
Therefore, an additional method of raising the temperature to increase the pressure inside the reactor is required, and there is also a problem that the yield of the final product is low
[0006] In addition, the phosgene gas used in the conventional phosgene process is highly toxic and a substance regulated by environmental regulations
Difficulties in storage and management as a separate cooling unit is required to store it

Method used

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  • Method of preparing diisocyanate composition and optical lens
  • Method of preparing diisocyanate composition and optical lens
  • Method of preparing diisocyanate composition and optical lens

Examples

Experimental program
Comparison scheme
Effect test

example 5

[0175] Step (1): Preparation of diamine hydrochloride composition

[0176] Reactor 1 was charged with 1,009.4 g (9.46 moles) of 35% aqueous hydrochloric acid (with the Fe ion content shown in Table 2 below), and then the internal temperature of Reactor 1 was lowered to 15° C. with stirring. While maintaining the temperature of Reactor 1 at 50° C. or lower, 627.0 g (4.4 moles) of H6XDA were introduced for 1 hour. After the introduction was completed, the internal temperature of the reactor was lowered to 10° C., and it was stirred for 1 hour. The internal temperature of Reactor 2 charged with 2,640.0 g of diethyl ether was lowered to -5°C. The mixture in Reactor 1 was slowly added dropwise to Reactor 2 at 0°C or lower.

[0177] After the addition was complete, the H6XDA·2HCl-containing diamine hydrochloride composition was separated by vacuum filtration using a filter and the filtered diethyl ether was recovered for reuse. Thereafter, the separated diamine hydrochloride comp...

example 6

[0181] Step (1): Preparation of diamine hydrochloride composition

[0182] 1,009.4 g (9.46 mol) of 35% aqueous hydrochloric acid solution (with Fe ion content shown in Table 2 below) was charged into the reactor, and then the internal temperature of the reactor was lowered to 15° C. with stirring. While maintaining the temperature of the reactor at 50° C. or lower, 490.1 g (4.4 moles) of HDA were introduced for 1 hour. After the introduction was completed, the internal temperature of the reactor was lowered to 10° C., and it was stirred for 1 hour. Thereafter, 1,320.0 g of tetrahydrofuran was introduced, and the internal temperature of the reactor was lowered to -5° C., followed by stirring for 1 hour. After the reaction, the diamine hydrochloride composition containing HDA·2HCl was separated by vacuum filtration using a filter, and the filtered tetrahydrofuran was recovered for reuse. Thereafter, the separated diamine hydrochloride composition was vacuum-dried at 90° C. and...

example 7

[0186] Step (1): Preparation of diamine hydrochloride composition

[0187] 1,009.4 g (9.46 moles) of 35% aqueous hydrochloric acid (with Fe ion content shown in Table 2 below) was charged into Reactor 1, and then the internal temperature of Reactor 1 was lowered to 15° C. with stirring. While maintaining the temperature of Reactor 1 at 50° C. or lower, 812.0 g (4.4 moles) of IPDA were introduced for 1 hour. After the introduction was completed, the internal temperature of the reactor was lowered to 10° C., and it was stirred for 1 hour. The internal temperature of Reactor 2 charged with 2,640.0 g of diethyl ether was lowered to -5°C. The mixture in Reactor 1 was slowly added dropwise to Reactor 2 at 0°C or lower. After the addition was complete, the IPDA·2HCl-containing diamine hydrochloride composition was separated by vacuum filtration using a filter and the filtered diethyl ether was recovered for reuse. Thereafter, the separated diamine hydrochloride composition was vac...

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Abstract

The invention discloses a method of preparing a diisocyanate composition and an optical lens. In the invention, an aqueous hydrochloric acid solution instead of hydrogen chloride gas and solid triphosgene instead of phosgene gas may be used in the process of preparing a diisocyanate from a diamine through a diamine hydrochloride. In addition, the invention provides processes for preparing a diisocyanate composition and an optical lens of higher quality by controlling the water content in the diamine hydrochloride composition for preparing a diisocyanate within a specific range.

Description

technical field [0001] Embodiments relate to methods of making diisocyanate compositions and optical lenses. More specifically, embodiments relate to methods of preparing diisocyanate compositions using diamine hydrochloride compositions, and methods of preparing optical lenses using the diisocyanate compositions. Background technique [0002] Isocyanates used as raw materials for plastic optical lenses are produced by a phosgene method, a non-phosgene method, a pyrolysis method, and the like. [0003] In the phosgene method, amines are used as raw materials and phosgene (COCl 2 ) gases react to synthesize isocyanates. In addition, in the non-phosgene method, dibromomethylbenzene is reacted with sodium cyanate in the presence of a catalyst to synthesize isocyanate. In the pyrolysis method, an amine is reacted with an alkyl chloroformate to prepare a carbamate, which is pyrolyzed at high temperature in the presence of a catalyst to synthesize an isocyanate. [0004] Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/38G02B1/04
CPCC08G18/7642C08G18/758C08G18/73C08G18/755C08G18/3876G02B1/04C07C263/10C08G18/753G02B1/041Y02P20/582C07C265/14C08L75/04C08L81/00C08G18/3855C08G18/3874B29D11/00009C07C263/20
Inventor 裵栽荣金正武韩赫熙明正焕郑周永甄明玉
Owner SKC CO LTD
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