Processes for the production of ethylene oxide and ethylene glycol
US11325877B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2018 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Nov 20, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C31/202
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the recovery of ethylene glycol from an aqueous stream comprising ethylene glycol is disclosed. The process comprises (a) subjecting an aqueous stream 5 comprising ethylene glycol to an evaporation step in a multiple-effect evaporator to obtain a concentrated stream comprising ethylene glycol; (b) subjecting said concentrated stream comprising ethylene glycol to a first dehydration step in a first dehydrator 10 operating at an overhead pressure in the range of 0 barg (bar gauge) to 4 barg (bar gauge) to obtain a partially dehydrated ethylene glycol stream, and (c) subjecting said partially dehydrated ethylene glycol stream to a second dehydration step in a second dehydrator operating under 15 vacuum to obtain a dehydrated ethylene glycol stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.