Reaction system and process for preparing polymethoxy dimethyl ether
US9168503B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 18, 2014 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Mar 18, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM3-8) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 50˜80 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM3-8 by an acetalization reaction. The raw materials of the reaction used in the invention are cheap and available easily, and the utilization rate of formaldehyde is high; an efficient separation between the catalyst and product, as well as the reuse of the catalyst and raw materials, are realized by a separation mode of combining extraction and rectification together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.