Method for dissolving saturated polyester solution for decomposing saturated polyester and method for decomposition using the same
The present invention provides a dissolution method for saturated polyester capable of recycling saturated polyester used in fibers, a film, a bottle and others with ease and a low cost, a solution decomposing saturated polyester and a decomposition method using the solution.
1. A solution for decomposing saturated polyester containing an alkali and a monoalcohol as a solvent, and not containing a solvent other than the monoalcohol.
2. The solution according to claim 1 , wherein the saturated polyester is polyalkylene terephthalate.
3. The solution according to claim 1 , wherein the monoalcohol is a lower alcohol.
4. The solution according to 1 , wherein the monoalcohol is methanol.
5. A solution for decomposing saturated polyester containing a salt of a phosphorus-containing acid and a monoalcohol as a solvent.
6. The solution according to claim 5 , wherein the saturated polyester is polyalkylene terephthalate.
7. The solution according to claim 5 , wherein the salt of a phosphorus-containing acid is in the form of a hydrate thereof.
8. The solution according to claim 5 , wherein the salt of a phosphorus-containing acid is an alkali metal salt of a phosphorus-containing acid.
9. The solution according to claim 5 , wherein the salt of a phosphorus-containing acid is potassium phosphate or potassium phosphate hydrate.
10. The solution according to claim 5 , wherein the monoalcohol is a lower alcohol.
11. The solution according to claim 5 , wherein the monoalcohol is methanol.
12. The solution according to claim 5 , further containing, as a solvent other than a monoalcohol, at least one kind selected from the group consisting of an amide solvent, a ketone solvent, an ether solvent, an ester solvent and a hydrocarbon solvent.
13. A decomposition method for saturated polyester, comprising decomposing the saturated polyester in the presence of the solution according to claim 5 .
14. The decomposition method for saturated polyester according to claim 13 , wherein the saturated polyester is a polyalkylene terephthalate.
15. The decomposition method for saturated polyester according to claim 13 , wherein a temperature of the solution in the decomposition is equal to or higher than a freezing point thereof and equal to or lower than a boiling point thereof.
16. The decomposition method for saturated polyester according to claim 13 , wherein a temperature of the solution in the decomposition is equal to or less than 150° C.
17. The decomposition method for saturated polyester according to claim 13 , wherein the decomposition is implemented under ordinary pressure.
18. The decomposition method for saturated polyester according to claim 13 , wherein at least one kind of decomposition product of the saturated polyester is a dicarboxylic acid dialkyl ester.
19. The decomposition method for saturated polyester according to claim 13 , wherein at least one kind of decomposition product of the saturated polyester is a diol.
20. The decomposition method for saturated polyester according to claim 13 , wherein the decomposition product of the saturated polyester is obtained in one step chemical reaction.
21. A decomposition method for saturated polyester, comprising decomposing the saturated polyester in the presence of the solution according to claim 1 .
22. The decomposition method for saturated polyester according to claim 21 , wherein the saturated polyester is a polyalkylene terephthalate.
23. The decomposition method for saturated polyester according to claim 21 , wherein a temperature of the solution in the decomposition is equal to or higher than a freezing point thereof and equal to or lower than a boiling point thereof.
24. The decomposition method for saturated polyester according to claim 21 , wherein a temperature of the solution in the decomposition is equal to or less than 150° C.
25. The decomposition method for saturated polyester according to claim 21 , wherein the decomposition is implemented under ordinary pressure.
26. The decomposition method for saturated polyester according to claim 21 , wherein at least one kind of decomposition product of the saturated polyester is a dicarboxylic acid dialkyl ester.
27. The decomposition method for saturated polyester according to claim 21 , wherein at least one kind of decomposition product of the saturated polyester is a diol.
28. The decomposition method for saturated polyester according to claim 21 , wherein the decomposition product of the saturated polyester is obtained in one step chemical reaction.
29. The solution according to claim 1 , said solution further comprising said saturated polyester.
30. The solution according to claim 29 , wherein said saturated polyester is polyalkylene terephthalate.
31. The solution according to claim 5 , said solution further comprising said saturated polyester.
32. The solution according to claim 31 , wherein said saturated polyester is polyalkylene terephthalate.