Process for purification of mixtures containing water, salts, glycolate ions and organic solvents
US4454045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Apr 26, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B31/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for purifying or working-up a mixture containing water, water-soluble salts, organic ions and organic solvents, particularly mixtures of water, NaCl, Na glycolate and aliphatic alcohols such as methanol or isopropanol, by separating the mixture into its components using acidic and/or basic ion exchangers, in particular, using weakly basic anion exchangers after optionally adjusting the pH of the mixture to an acid value. The process is especially suited for purifying liquid reaction media and/or washing media from the production of polysaccharides, such as cellulose ethers or starch ethers containing sodium-carboxymethyl group substituents, which are prepared from polysaccharides, an alkali metal hydroxide and monochloroacetate ions in a medium containing water and at least one organic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.