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Metal base ionic liquid catalyst and method for degrading polyethylene glycol terephthalate by using the same

The technology of polyethylene terephthalate and ethylene phthalate is applied in the field of ionic liquid catalysts and degraded polyester materials, and can solve the problems of large amount of ionic liquid catalysts and long reaction time, etc. The catalyst dosage is small, the reaction speed is fast, and the effect of no secondary pollution

Inactive Publication Date: 2012-06-27
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the technical problems of large consumption and long reaction time of the existing ionic liquid catalyst for degrading PET, and provide a metal-based ionic liquid catalyst and a method for using it to degrade polyethylene terephthalate

Method used

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  • Metal base ionic liquid catalyst and method for degrading polyethylene glycol terephthalate by using the same

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specific Embodiment approach 1

[0011] Specific embodiment one: the metal-based ionic liquid catalyst of the present embodiment is or a combination of several of them, where R 1 for C 1 ~C 10 the alkyl chain, R 2 for C 1 ~C 10 the alkyl chain, R 3 for C 1 ~C 10 The alkyl chain, the value of n is an integer from 1 to 9, the value of m is an integer from 1 to 5, and M is Al 3+ , Fe 2+ 、Ni 2+ , Pb 2+ , Zn 2+ , Mn 2+ , Mg 2+ , Ca 2+ 、Cu 2+ or Sn 2+ , X - for Br - , Cl - or H 3 CCOO - , a 1 The value of is 0.1~3, a 2 The value of is 0.1~3, a 3 The value of is from 0.1 to 3, and the value of b is the number of valence electrons of M.

[0012] When the metal-based ionic liquid catalyst is a composition, various metal-based ionic liquids are combined in any ratio.

[0013] This embodiment utilizes the principle of transesterification to degrade polyethylene terephthalate under the catalytic action of a metal-based ionic liquid catalyst. The dosage of the metal-based ionic liquid catalyst ...

specific Embodiment approach 2

[0014] Specific embodiment two: the difference between this embodiment and specific embodiment one is that R 1 for C 3 ~C 7 the alkyl chain. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one is that R 2 for C 3 ~C 7 the alkyl chain. Others are the same as in the first embodiment.

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Abstract

The invention discloses a metal base ionic liquid catalyst and a method for degrading polyethylene glycol terephthalate by using the same, relating to an ionic liquid catalyst and a method for degrading polyester materials. The invention solves the technical problems that the existing ionic liquid catalysts for degrading PET have large dosage and long reaction time. The metal base ionic liquid catalyst is a combination of one or several of the followings. The method comprises the following steps: weighing raw materials and adding in a reactor, heating up to 90-210 DEG C and stirring for 0.5-5 h to complete the degradation of polyethylene glycol terephthalate. The method has the advantages of mild reaction conditions, small catalyst dosage, quick reaction speed, easy recovery, and no secondary pollution, wherein the PET conversion rate reaches 60-100 % in 0.5-5 h, and the monomer yield reaches 20-90 %. The invention can be used for degradation and reclamation of waste polyethylene glycol terephthalate.

Description

technical field [0001] The invention relates to an ionic liquid catalyst and a method for degrading polyester materials thereof. Background technique [0002] As one of the main components of "white pollution", polyethylene terephthalate (PET) mainly comes from packaging materials in food, beverage, medical and other fields and waste generated in PET production and processing. These PET wastes / waste are large in quantity, light in quality, occupy a large space, and because of the chemical inertness of PET polyester, it is difficult to be degraded by air or microorganisms, which has caused a great impact on the environment. Regarding the research on the recycling of PET polyester, the development of new degradation reaction catalysts has always been a hot and difficult issue. Ionic liquids are a new type of environmentally friendly catalysts, which are greatly favored in the fields of synthesis and catalysis, but so far, there are not many reports using ionic liquids to cata...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J31/04C07C69/82C07C67/03
Inventor 岳群峰杨华光王春晓梁桂英
Owner HARBIN NORMAL UNIVERSITY
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