US4233202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of epoxy compounds
Assignee: Huels AG
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Filing: 1977-02-04
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Granted: 1980-11-11
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Expires: 1997-02-04
Abstract
Abstract The low molecular water-soluble onium-catalyst dissolved in the liquid mixture of epoxy resin and excess epihalohydrin obtained by the reaction in the presence of base of a compound having --OH, --SH, --COOH or ═NH groups with excess 1-halo-2,3-epoxyalkane, is separated therefrom by 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° C. and can only be partially removed by drying at 200° C. under vacuum (about 1 millibar), and then separating the adsorbent with catalyst adsorbed thereon from the liquid mixture.
Inventors
- 👤 Dieter Berger
- 👤 Wilfried Bartz
- 👤 Wolfgang Seeliger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:10
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/16; C07D301/00; C07D301/32; C07D303/18; C07D303/20; C07D303/24; C08; C08G; C08G59/00; C08G59/02; C08G59/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
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 ═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° C. and can only be partially removed by drying at 200° C. under vacuum (about 1 millibar), and then separating the adsorbent with catalyst adsorbed thereon from the liquid mixture.
Claim 2
Dependent Claim
149 words
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 ═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° C. and can only be partially removed by drying at 200° C. under vacuum (about 1 millibar), and then separating the adsorbent with catalyst adsorbed thereon from the liquid mixture.
Claim 3
Dependent Claim
26 words
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.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the adsorbent has a water content of 1-4% by weight.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the starting liquid reaction mixture contains 0.05-3% by weight of water.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein the catalyst is a water-soluble ammonium-, phosphonium- or sulfonium compound.
Claim 7
Dependent Claim
13 words
A process according to claim 1, wherein the 1-halo-2,3-epoxyalkane is epichlorohydrin or β-methylepichlorohydrin.
Claim 8
Dependent Claim
30 words
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.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein the process is conducted batch-wise by adding the adsorbent to the starting liquid reaction mixture.
Claim 10
Dependent Claim
25 words
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.
Claim 11
Dependent Claim
57 words
A process according to claim 1 wherein the 1-halo-2,3-epoxyalkane is epichlorohydrin or β-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.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |