Process for purifying organic solvents
AssigneeDow Global Technologies LLC
InventorsQi Jiang, Kaoru Ohba
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Abstract
A process for purifying (i) a hydrophilic organic solvent, (ii) a hydrolysable organic solvent, or (iii) a mixture of a hydrophilic organic solvent and a hydrolysable organic solvent by removing ionic contaminants from the hydrophilic organic solvent, from the hydrolysable organic solvent, or from the mixture of a hydrophilic and a hydrolysable organic solvent without generation of by-product impurities, the process including the steps of contacting the hydrophilic organic solvent, the hydrolysable organic solvent, or the mixture of hydrophilic and hydrolysable organic solvents with a mixed bed of ion exchange resin; wherein the mixed bed of ion exchange resin includes a mixture of: (a) a weak-acid cationic ion exchange resin and (b) a weak-base anionic ion exchange resin.
Claims10
A process for purifying a mixture of a hydrophilic organic solvent and a hydrolysable organic solvent by removing ionic contaminants from the mixture of the hydrophilic and the hydrolysable organic solvent without increment of organic impurities, the process comprising contacting the mixture of hydrophilic and hydrolysable organic solvents with a mixed bed of ion exchange resin;
- wherein the mixed bed of ion exchange resin comprises a mixture of:
- (a) a weak-acid cationic ion exchange resin and (b) a weak-base anionic ion exchange resin.
A process for removing ionic contaminants from an organic solvent, comprising the steps of:
- (a) preparing a mixed bed of ion exchange resin comprising a cationic ion exchange resin and an anionic ion exchange resin, wherein the cationic ion exchange resin is a weak-acid cationic ion exchange resin;
- and wherein the anionic ion exchange resin is a weak-base anionic ion exchange resin, and
- (b) contacting a mixture of a hydrophilic organic solvent and a hydrolysable organic solvent with the mixed bed of ion exchange resin of step (a).
Dependencies are inferred from the claim text.