Thermolysis of polypropiolactone to produce acrylic acid
US10065914B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2017 |
| Grant date | Sep 4, 2018 |
| Priority date | — |
| Expiry date | Apr 24, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to reactor apparatus and processes for thermolysis of polypropiolactone to produce highly pure acrylic acid. In preferred embodiments of the present invention, the processes comprise introducing a feed stream comprising polypropiolactone to a thermolysis process vessel through an inlet; maintaining a concentration of active salt by adding and removing portions of active salt by at least one inlet and at least one outlet; heating the thermolysis process vessel; and recovering a product including acrylic acid from an outlet. In certain preferred embodiments, the active salt may be present as a catalyst used for polymerization of the polypropiolactone in the feed stream. In some embodiments, one or more active salts may be added to the feed stream and/or the thermolysis process vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.