Process for purification of dimethyl sulphoxide (DMSO)
US6020530A · kind A · utility
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Key dates
| Filing date | May 14, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 14, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C315/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
To purify a dimethyl sulfoxide (DMSO), this DMSO is placed in contact with an ion exchange resin of sulfonic type in --SO.sub.3 NH.sub.4 form, and the DMSO is then separated from the resin. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.