Removal of sulfate from meg streams using calcium chloride
US12037308B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2022 |
| Grant date | Jul 16, 2024 |
| Priority date | — |
| Expiry date | Jan 18, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/88
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A MEG recovery process is described, in which a MEG stream is processed by performing a divalent treatment to reduce dissolved divalent cations in the portion of the stream; performing a sulfate treatment to reduce dissolved sulfate ions in the stream, the sulfate treatment comprising adding an underdose of one or more calcium halides, one or more lower calcium carboxylates, or a mixture thereof to a treatment stream; and precipitating calcium sulfate from the treatment stream; performing a solids removal treatment to reduce solids in the stream; and returning the treated stream, depleted in divalent cations, sulfate ions, and solids, to the MEG recovery process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.