System and method for continuously producing polyoxymethylene dimethyl ethers
US9169186B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2012 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Aug 30, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A system and method for producing polyoxymethylene dimethyl ethers (DMMn) using an aqueous formaldehyde solution as the initial reaction material. The process system has a polymerization reaction unit, an acetalation unit, a product separation unit, and a catalyst regeneration unit. Both polymerization and acetalation reaction are conducted in the presence of an ionic liquid as a catalyst, which can achieve the effect that two different reactions may be catalyzed by the same ionic liquid. The present invention employs a simple catalyst system, and achieves the efficient separation of the catalyst, the byproduct water, the product and the reaction materials in a separation manner combining the extraction and the rectification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.