| Abstract: |
A method of recovering lactide which includes introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber (3) that is maintained under a reduced pressure using a first screw conveyer passage (11) that extends in the vent chamber (3), gasifying the lactide contained in the molten resin composition, and recovering a gaseous lactide from the vent chamber, wherein a second screw conveyer passage (60) is provided under the first screw conveyer passage (11) in the vent chamber (3) to recover the carrier resin. |
| Inventor: |
ITO, Takuro (Tokyo, JP); TANABE, Junko (Yokohama-shi, Kanagawa, JP); TAGUCHI, Tomoaki (Yokohama-shi, Kanagawa, JP) |
| Applicant: |
Toyo Seikan Co., Ltd. (Tokyo, JP) |
| Face Assignee: |
Toyo Seikan Co., Ltd. (Tokyo, JP) |
| Filed: |
2016-12-07 |
| Issued: |
2018-12-06 |
| Claims: |
9 |
|
US20180346682
|
1. A method of recovering lactide comprising introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber that is maintained under a reduced pressure by using a first screw conveyer passage that is extending in the vent chamber, gasifying the lactide contained in said molten resin composition, and recovering a gaseous lactide from said vent chamber, wherein a second screw conveyer passage is provided under said first screw conveyer passage in said vent chamber to recover the carrier resin.
(5)
(0)
|
|
9. A method of recovering lactide comprising introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber that is maintained under a reduced pressure by using a screw conveyer passage that is extending in the vent chamber, gasifying the lactide contained in said molten resin composition, and recovering a gaseous lactide from said vent chamber, wherein a return member is provided over the screw conveyer passage to return the resin masses formed accompanying the gasification of said lactide back to said screw conveyer passage. (0)
|
|
