Chemical recycling of plastic purging materials

Abstract

The present invention provides a process and facilities for using one or more PET-containing materials as feedstock for chemical recycling facilities, particularly solvolysis facilities. [Solution] A method for recycling plastic waste, comprising: (a) supplying a certain amount of PET-containing purge solidification material separated from the plastic waste to a chemical recycling facility; and (b) depolymerizing at least a portion of the purge material in the chemical recycling facility.

Claims

1. A method of recycling plastic waste, (a) A step of supplying a certain amount of PET-containing purging solidification material separated from the plastic waste to a chemical recycling facility, and (b) The step of depolymerizing at least a portion of the purged material in the chemical recycling facility. Methods that include...

2. The method according to claim 1, wherein the supplying step (a) includes the step of directly supplying a certain amount of purged solidification material to a solvolysis facility within the chemical recycling facility.

3. The method according to claim 1, further comprising the step of reducing the size of a certain amount of purged solidified material before the depolymerizing step (b) to form a certain amount of plastic particle solids.

4. The method according to claim 3, wherein the reduction step includes a mechanical refinement process.

5. The method according to claim 4, wherein the mechanical pulverization process comprises forming a certain amount of plastic particle solid by shredding, chopping, crushing, guillotine cutting, dropping, and / or crushing a certain amount of purged solid material.

6. The method according to claim 5, wherein the mechanical pulverization process includes a step of shredding, and the plastic particle solid has a D90 particle size of less than 5.08 cm (2 inches).

7. The method according to claim 6, wherein no pulverizer is used to reduce the size of the purged solidified material.

8. (i) Before step (b) of recovering a certain amount of plastic granules generated from the shredding step having a D90 of less than 0.32 cm (1 / 8 inch) and depolymerizing them, the step of densifying at least a portion of the plastic granules into plastic particles having a D90 particle size of 0.32 cm (1 / 8 inch) to 2.54 cm (1 inch), and / or (ii) Before step (b) collecting a certain amount of large plastic particles generated from the shredding step and having a D90 greater than 2.54 cm (1 inch), shredding at least a portion of the large plastic particles into plastic particles having a D90 particle size of 0.32 cm (1 / 8 inch) to 2.54 cm (1 inch). The method according to claim 6, further comprising one or both of the above.

9. The method according to claim 3, wherein the plastic particle solid has a D90 particle size of less than 15.2 cm (6 inches).

10. The method according to claim 3, wherein the reducing step produces a certain amount of dry granules, yarn, strands, and / or fibrous material.

11. The method according to claim 10, wherein a certain amount of dried granules, threads, strands, and / or fibrous material is recovered and densified to plastic particles having a D90 particle size of 0.32 cm (1 / 8 inch) to 2.54 cm (1 inch) prior to the depolymerization step (b).

12. The method according to any one of claims 1 to 11, wherein the certain amount of purged solidification material comprises at least 90 weight percent PET on a dry basis.

13. The method according to any one of claims 1 to 11, wherein the aforementioned amount of purging solidification material contains 50% by weight or less of polyolefin.

14. The method according to any one of claims 1 to 11, wherein the aforementioned amount of purging solidification material contains 20% by weight or less of PVC.

15. The method according to any one of claims 1 to 11, wherein the aforementioned amount of purging solidification material comprises at least 0.1 weight percent of copolyester on a dry basis.

16. The method according to any one of claims 1 to 11, wherein the certain amount of purge solidification material comprises at least 95 weight percent of a material that is solid at the processing temperature of the molten polymer processing apparatus in which the certain amount of purge solidification material is produced.

17. The method according to claim 16, wherein the solid comprises glass, metal, and / or other fillers.

18. The method according to any one of claims 1 to 11, wherein the aforementioned amount of purge solidification material is produced by a PET reclaimer facility, a PET product manufacturer, and / or a polymer manufacturing facility.

19. The method according to any one of claims 1 to 11, wherein the certain amount of purging solidification material comprises transparent plastic and / or colored plastic.

20. Use of PET-containing purging solidification materials as raw materials supplied to chemical recycling facilities.

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