Process for recovering and improving production of meso-lactide from a crude lactide containing stream
US9573925B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2014 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | May 6, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2009/0086
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the recovery and production of meso-lactide from a crude lactide containing stream may include subjecting a starting crude lactide stream to a first distillation step to obtain: a top stream mainly containing meso-lactide; a bottom stream; and a side stream mainly containing L-lactide and meso-lactide. The process may include recovering the side stream and subjecting the side stream to a melt crystallization step to obtain: a first purified stream mainly containing L-lactide; and a drain stream mainly containing meso-lactide and L-lactide. The process may include recovering the top stream and drain stream, and subjecting the top stream and drain stream to a second distillation step to obtain a second purified stream containing L-lactide and meso-lactide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.