Crosslinked polyester amide membranes and their use for organic separations
US5290452A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1991 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Dec 5, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is directed to a polyester/amide membrane, its preparation and its use for organic liquid separation. The polyester/amide membrane is made by reacting a dianhydride with a polyester diol in a 2:1 to 1.05:1 mole ratio to end cap the diol to produce a prepolymer which is reacted with excess thionyl chloride to convert all of the unreacted anhydride and all carboxylic acid groups to acid chloride groups. The resulting acid chloride derivative is dissolved in organic solvent and interfacially reacted with a diamine dissolved in an aqueous solvent. The excess solutions are removed and the resulting thin film membrane is dried. The membranes are useful for organic liquid separations, especially the separation of aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons, preferably under perstraction or pervaporation conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.