Process for producing 6-hydroxycaproic ester and process for producing trialkylamine

A technology of hydroxycaproic acid ester and production method, which is applied in the preparation of carboxylate, the preparation of amino compounds, chemical instruments and methods, etc., can solve the problems of no other use, high energy consumption, etc.

Inactive Publication Date: 2009-03-04
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, ε-caprolactam obtained by depolymerization of nylon 6 has almost no other uses other than being used as a monomer of nylon 6.
From the viewpoint of chemical recycling, when reusing nylon 6 waste for various purposes, it needs to be decomposed into hydrogen, carbon monoxide, methane, etc., so there is a problem of consuming a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Next, examples of the method for producing methyl 6-hydroxyhexanoate of the present invention will be described. First, as Example 1, 0.3 g of nylon 6 (Nylon grain 1022B manufactured by Ube Industries, Ltd.) and 4 g of methanol (water content: 1600 ppm) were placed in a reaction tube made of SUS316 (stainless steel) with a volume of 10 mL, and the reaction tube was replaced with argon gas. The air in the dead zone is then sealed. Put the sealed reaction tube in an electric furnace heated to 300°C and let it stand for 1 hour (pressure 20.3MPaG), then take the reaction tube out of the electric furnace, and immerse the reaction tube in water to cool it to the atmosphere temperature.

Embodiment 2

[0021] As Example 2, the manufacture of 6-hydroxyhexanoic acid methyl ester was performed similarly to Example 1 (pressure 20.3 MPaG) except having set reaction time to 2 hours.

Embodiment 3

[0023] As Example 3, the manufacture of 6-hydroxyhexanoic acid methyl ester was performed similarly to Example 1 (pressure 20.3 MPaG) except having set reaction time to 3 hours.

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PUM

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Abstract

A process for producing a 6-hydroxycarpoic ester and a process for producing a trialkylamine in both of which nylon-6, epsilon-caprolactam, which is a monomer therefor, etc. are used as a raw material. The processes are intended to make nylon-6 wastes reusable in various applications without consuming a large quantity of energy. The process for producing a 6-hydroxycarpoic ester and process for producing a trialkylamine are characterized by reacting amide compounds basically comprising epsilon-caprolactam with an alcohol in a supercritical state to obtain a 6-hydroxycaproic ester and a trialkylamine.

Description

technical field [0001] The present invention relates to a method for producing 6-hydroxyhexanoic acid ester which can be used as an intermediate material in organic synthesis, and a method for producing trialkylamine which can be used as an intermediate material for pharmaceuticals, surfactants, and chemical reagents in the field of the electronics industry, etc. . Background technique [0002] Nylon 6 is used in various applications such as films and engineering plastics. In recent years, recycling of nylon 6 has begun due to emphasis on waste reduction, effective use of resources, and environmental protection. [0003] As recycling of nylon 6, for example, Patent Document 1 describes the 2 ~500kg / cm 2 It is a method of depolymerizing ε-caprolactam oligomers into ε-caprolactam by contacting it with high-temperature and high-pressure water under certain conditions. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2000-191638 [0005] However, ε-caprolactam obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/20C07C69/675C07C209/14C07C211/04
CPCC07C209/14C07C67/20Y02P20/54C07C69/675C07C211/04
Inventor 上村明男杉本常实海矶孝二
Owner UBE IND LTD
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