Claims
- 1. A process for the separation of the low molecular water-soluble onium-catalyst dissolved in the liquid mixture of epoxy resin and epihalohydrin obtained by the reaction in the presence of base of a compound having --OH, --SH, --COOH or .dbd.NH groups with excess 1-halo-2,3-epoxyalkane, consisting essentially of contacting the liquid mixture, either prior to or after separation therefrom of the precipitated salt produced by the reaction, with at least about 5 parts by weight based on the weight of the catalyst present in the liquid mixture, of an adsorbent containing or capable of absorbing at least 1% by weight of water so strongly that it cannot be removed either by drying over concentrated sulfuric acid or by drying at 110.degree. C. and can only be partially removed by drying at 200.degree. C. under vacuum (about 1 millibar), and then separating the adsorbent with catalyst adsorbed thereon from the liquid mixture.
- 2. A process according to claim 1, wherein the adsorbent is activated carbon, bleaching clay, fuller's earth, bauxite, bentonite, kaolinite, montmorillonite, kieselguhr, silica gel, or aluminum oxide.
- 3. A process according to claim 1, wherein the adsorbent has a water content of 1-4% by weight.
- 4. A process according to claim 1, wherein the starting liquid reaction mixture contains 0.05-3% by weight of water.
- 5. A process according to claim 1, wherein the catalyst is a water-soluble ammonium-, phosphonium- or sulfonium compound.
- 6. A process according to claim 1, wherein the 1-halo-2,3-epoxyalkane is epichlorohydrin or .beta.-methylepichlorohydrin.
- 7. A process according to claim 6, wherein the adsorbent is mixed with a starting liquid mixture containing suspended therein the sodium chloride produced in the production of the epoxy resin.
- 8. A process according to claim 1, wherein the process is conducted batch-wise by adding the adsorbent to the starting liquid reaction mixture.
- 9. A process according to claim 1, wherein the process is conducted continuously by passing the starting liquid reaction mixture through a column of the adsorbent.
- 10. A process according to claim 1 wherein the 1-halo-2,3-epoxyalkane is epichlorohydrin or .beta.-methylepichlorohydrin, wherein the adsorbent is mixed at ambient temperature with a starting liquid mixture containing suspended therein the sodium chloride produced in the production of the epoxy resin, and wherein the process is conducted batch-wise by adding the adsorbent to the starting liquid reaction mixture.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2416227 |
Apr 1974 |
DEX |
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CROSS-REFERENCE TO OTHER APPLICATIONS
This is a continuation-in-part of Application Ser. No. 563,163, filed Mar. 28, 1975 now abandoned.
Foreign Referenced Citations (1)
Number |
Date |
Country |
119415 |
Aug 1966 |
CSX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
563163 |
Mar 1975 |
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