Purification of solvents used for the purification of alkylene oxide
US7182841B2 · kind B2 · utility
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12References
31Claims
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Assignee
Inventors
Key dates
| Filing date | Apr 23, 2003 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Sep 13, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D3/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention concerns a process for removing carbonyl-containing impurities from impure extractive distillation solvent such as a glycol, comprising: contacting the impure extractive distillation solvent with an acidic ion exchange resin. The purified extractive distillation solvent can be recycled for use as a solvent in an extractive distillation process that removes impurities from alkylene oxide. The extractive distillation solvent can be ethylene glycol monomethyl ether (EGME) used to purify propylene oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.