PREPARATION METHOD OF ION CATALYST MATERIAL FOR PET CHEMICAL RECYCLING AND PET CHEMICAL RECYCLING METHOD

Abstract

Provided are a preparation method of an ion catalyst material for PET chemical recycling and a PET chemical recycling method. The preparation method of an ion catalyst material for PET chemical recycling includes the following. A metal chloride is added to an alkylimidazole-chloride ionic liquid to form a bisalkylimidazole-metal tetrachloride ionic liquid that is grafted on a porous carrier.

Claims

1. A preparation method of an ion catalyst material for PET chemical recycling, comprising: adding a metal chloride to an alkylimidazole-chloride ionic liquid to form a bisalkylimidazole-metal tetrachloride ionic liquid that is grafted on a porous carrier.

2. The preparation method of an ion catalyst material for PET chemical recycling according to claim 1, wherein the metal chloride comprises iron chloride, zinc chloride, or cobalt chloride.

3. The preparation method of an ion catalyst material for PET chemical recycling according to claim 1, wherein the porous carrier comprises nano iron oxide, silicon oxide, or activated carbon.

4. The preparation method of an ion catalyst material for PET chemical recycling according to claim 1, wherein a ratio of the metal chloride to the alkylimidazole-chloride ionic liquid is 1 to 2.

5. The preparation method of an ion catalyst material for PET chemical recycling according to claim 1, wherein the porous carrier has a graft rate of 6% to 10%.

6. A PET chemical recycling method, comprising: adding a PET chemical recycling ion catalyst material prepared by the preparation method of an ion catalyst material for PET chemical recycling according to claim 1 to PET waste and ethylene glycol, followed by heating and stirring to obtain depolymerized and decolorized bis(2-hydroxyethyl)terephthalate (BHET); and filtering and recycling the ion catalyst material for PET chemical recycling.

7. The PET chemical recycling method according to claim 6, wherein the PET waste comprises a packaging material or a textile fabric.

8. The PET chemical recycling method according to claim 6, wherein a ratio of the PET waste to the ethylene glycol is 1:3 to 1:6.

9. The PET chemical recycling method according to claim 6, wherein an addition amount of the ion catalyst material for PET chemical recycling is 0.5% to 2%.

10. The PET chemical recycling method according to claim 6, wherein a heating temperature is 180° C. to 210° C., a stirring speed is 100 rpm to 150 rpm, and stirring time is 3 hours to 6 hours.

Description

DESCRIPTION OF EMBODIMENTS

[0018] Hereinafter, embodiments of the disclosure will be described in detail. However, these embodiments are illustrative, and the disclosure is not limited thereto.

[0019] In the present specification, a range represented by “a numerical value to another numerical value” is a schematic representation for avoiding listing all of the numerical values in the range in the specification. Therefore, the recitation of a specific numerical range covers any numerical value in the numerical range and a smaller numerical range defined by any numerical value in the numerical range, as is the case with any numerical value and a smaller numerical range thereof in the specification.

[0020] The disclosure provides a preparation method of an ion catalyst material for PET chemical recycling. The preparation method includes the following. A metal chloride is added to an alkylimidazole-chloride ionic liquid to form a bisalkylimidazole-metal tetrachloride ionic liquid that is grafted on a porous carrier.

[0021] In the present embodiment, the metal chloride may include iron chloride, zinc chloride, or cobalt chloride. However, the disclosure is not limited thereto. A ratio of the metal chloride to the alkylimidazole-chloride ionic liquid is 1 to 2. The porous carrier may include nano iron oxide, silicon oxide, or activated carbon. However, the disclosure is not limited thereto. The porous carrier has a graft rate of about 6% to 10%.

[0022] The disclosure also provides a PET chemical recycling method including the following. A PET chemical recycling ion catalyst material prepared by the above-mentioned preparation method of an ion catalyst material for PET chemical recycling is added to PET waste and ethylene glycol, followed by heating and stirring to obtain depolymerized and decolorized bis(2-hydroxyethyl)terephthalate (BHET). Then, the ion catalyst material for PET chemical recycling is filtered and recycled.

[0023] In the present embodiment, the PET waste may include a packaging material or a textile fabric. However, the disclosure is not limited thereto. A ratio of the PET waste to the ethylene glycol is, for example, 1:3 to 1:6. An addition amount of the ion catalyst material for PET chemical recycling is, for example, 0.5% to 2%. A heating temperature is, for example, 180° C. to 210° C., a stirring speed is, for example, 100 rpm to 150 rpm, and stirring time is, for example, 3 hours to 6 hours.

[0024] By the PET chemical recycling method according to the disclosure, in an experimental example for a textile fabric, after being subjected to depolymerization, BHET purification, and polymerization, the textile fabric was subjected to gel permeation chromatography (GPC) testing, in which depolymerization efficiency was measured as 93%, and chromatic values were measured as an L value of 85 to 90, an a value of −1 to 1, and a b value of 1 to 4.

[0025] In summary, in the preparation method of an ion catalyst material for PET chemical recycling according to the disclosure, a porous material is used as a carrier so as to improve the decolorization ability with respect to PET waste (especially a textile fabric), and a bisalkylimidazole-metal tetrachloride ionic liquid is used so as to improve the depolymerization ability. In this way, in the disclosure, decolorization and depolymerization can be achieved and recycling can be facilitated by a simple manufacturing process. Accordingly, the problems of the related art, such as that depolymerization and decolorization need to be separately performed and recycling of a catalyst is not easy, can be effectively eliminated, and the cost can be reduced.