The present invention relates to the depolymerization of polymers and the recovery of the starting materials used for the production of the polymer. The present invention also relates to the depolymerization of polyethylene terephthalate (PET) and the recovery of terephthalic acid and ethylene glyco
The present invention relates to the depolymerization of polymers and the recovery of the starting materials used for the production of the polymer. The present invention also relates to the depolymerization of polyethylene terephthalate (PET) and the recovery of terephthalic acid and ethylene glycol.
대표청구항▼
1. A process for depolymerizing a polymer comprising an ester functionality to the corresponding alcohol and carboxylic acid components for use in the production of new polymers, comprising admixing the polymer with a mixture of: (i) a non-polar solvent for swelling the polymer; and(ii) an agent for
1. A process for depolymerizing a polymer comprising an ester functionality to the corresponding alcohol and carboxylic acid components for use in the production of new polymers, comprising admixing the polymer with a mixture of: (i) a non-polar solvent for swelling the polymer; and(ii) an agent for breaking the ester functionality consisting of a mixture of an alcohol and a hydroxide;wherein the admixing is continued for a sufficient time to depolymerize at least a portion of the polymer to the corresponding alcohol and carboxylic acid components; andwherein the process is performed without applying external heat. 2. The process of claim 1, wherein the mixture of the alcohol and the hydroxide is added to the polymer simultaneously with the non-polar solvent. 3. The process of claim 1, wherein the ratio of the non-polar solvent to alcohol is about 1:10 to about 1:50 (v:v). 4. The process of claim 1, wherein the polymer is admixed with the non-polar solvent, the hydroxide, and the alcohol for about 0 h to about 5 h. 5. The process of claim 4, wherein the polymer is admixed with the non-polar solvent, the hydroxide, and the alcohol at atmospheric pressure. 6. The process of claim 1, wherein the non-polar solvent for swelling the polymer is a halogenated solvent. 7. The process of claim 1, wherein the alcohol is a linear C1-C4 alcohol. 8. The process of claim 1, wherein the hydroxide is selected from a group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, an ammonium hydroxide, and a combination thereof. 9. The process of claim 1, wherein the polymer is in the form of waste material. 10. The process of claim 9, wherein the waste material further comprises debris that do not include polymers comprising an ester functionality. 11. The process of claim 10, wherein debris comprises at least one of bottle caps, glue, paper, residual liquid, and dirt. 12. The process of claim 1, wherein the polymer comprising the ester functionality is polyethylene terephthalate and wherein the corresponding alcohol and carboxylic acid components for use in the production of new polymers are terephthalic acid or salt thereof and ethylene glycol. 13. The process of claim 12, wherein the terephthalic acid or salt thereof obtained from the depolymerization process contains less than about 1% impurity (w/w). 14. The process of claim 13, wherein the impurity comprises at least one of isophthalic acid, phthalic acid, 4-methylbenzoic acid, 4-formylbenzoic acid, and metals. 15. A process for depolymerizing of polymer comprising an ester functionality to the corresponding alcohol and carboxylic acid components for use in the production of new polymers, comprising admixing the polymer with a mixture of: about 3 to about 5% (vol.) of a non-polar solvent for swelling the polymer, wherein the non-polar solvent is a halogenated solvent;(ii) about 95 to about 97% (vol.) of a linear C1-C4 alcohol; and(iii) a hydroxide;wherein the admixing is continued for about 1 h; andwherein the process is performed without applying external heat. 16. The process of claim 15, wherein the polymer comprising the ester functionality is polyethylene terephthalate and wherein the corresponding alcohol and carboxylic acid components for use in the production of new polymers are terephthalic acid or salt thereof and ethylene glycol. 17. The process of claim 16, wherein the terephthalic acid or salt thereof obtained from the depolymerization process contains less than about 1% impurity (w/w). 18. The process of claim 17, wherein the impurity comprises at least one of isophthalic acid, phthalic acid, 4-methylbenzoic acid, 4-formylbenzoic acid, and metals. 19. A process for depolymerizing polyethylene terephthalate to terephthalic acid or salt thereof and ethylene glycol comprising admixing polyethylene terephthalate with a mixture of: (i) about 3 to about 5% (vol.) of a non-polar solvent for swelling the polymer, wherein the non-polar solvent is a halogenated solvent;(ii) about 95 to about 97% (vol.) of a linear C1-C4 alcohol; and(iii) a hydroxide;wherein the admixing is continued for about 1 h; andwherein the process is performed without applying external heat.
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이 특허에 인용된 특허 (14)
Hedrick, James Lupton; Kilickiran, Pinar; Nyce, Gregory Walker; Waymouth, Robert M., Catalytic depolymerization of polymers containing electrophilic linkages using nucleophilic reagents.
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Tindall George W. (Kingsport TN) Perry Randall L. (Bluff City TN) Spaugh ; Jr. Art T. (Kingsport TN), Depolymerization of substantially amorphous polyesters.
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