Process for the purification of ethylene glycol
US11198664B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2018 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Jun 26, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a process for the purification of ethylene glycol from a crude stream thereof. The process comprises passing the stream of crude ethylene glycol to a first distillation column in which light compounds within the crude stream are separated overhead and a lights-removed crude ethylene glycol stream is removed from at or near the bottom of the first distillation column; passing the lights-removed crude ethylene glycol stream removed from at or near the bottom of the first distillation column to a second distillation column in which purified ethylene glycol is separated and recovered from heavy components present in the lights-removed crude ethylene glycol stream; removing a stream from at or near the bottom of the second distillation column which comprises residual ethylene glycol together with diethylene glycol and heavy compounds and passing said stream to a third distillation column in which the heavy compounds are separated from the stream comprising ethylene glycol and diethylene glycol; and removing the stream comprising ethylene glycol and diethylene glycol from the third distillation column and passing said stream to a fourth distillation c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.