Production of trimethylene carbonate from poly (trimethylene carbonate) by wiped film reactive evaporation
US7005496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2004 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Jul 9, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D319/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for producing trimethylene carbonate poly(trimethylene carbonate which comprises (a) introducing liquid poly(trimethylene carbonate) and an optional catalyst into a wiped film evaporator reactor under a vacuum about 15 kPa or less, said reactor having walls heated to at least about 230° C. and an internal condenser heated to a temperature above the boiling point of trimethylene carbonate, (b)spreading the poly(trimethylene carbonate) into a thin film and allowing it to flow down the interior surface of the heated walls, (c) depolymerizing the poly(trimethylene carbonate) to form trimethylene carbonate which is driven to the internal condenser and residue poly(trimethylene carbonate) which continues down the reactor, and (d) collecting the trimethylene carbonate in a cooled distillate receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.