Process for continuously producing polyoxymethylene dimethyl ethers at low temperature
US11084772B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 28, 2020 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Apr 28, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C43/303
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The disclosure relates to a process for continuously producing polyoxymethylene dimethyl ethers at low temperature, pertains to the technical field of polyoxymethylene dimethyl ether preparation processes, and solves the technical problem of continuous production of polyoxymethylene dimethyl ether. A membrane separation element with precisely controlled pores in membrane is used to realize a direct separation of the feedstocks from the catalyst within the reactor, and effectively reduce the permeation resistance of the separation membrane tube. By oppositely switching the flowing direction of liquid reaction materials, the adhesion of the catalyst to the separation membrane tube is inhibited, and some particles stuck in separation membrane tube are removed, which ensures the continuous operation of the reaction process and allows a molecular sieve catalyst to exhibit its advantage of long catalytic life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.