Patent US4890734A successfully refreshed from Google Patents.
US4129718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of catalyst from polyether polyol
Assignee: BASF Corp
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Filing: 1977-12-01
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Granted: 1978-12-12
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Expires: 1997-12-01
Abstract
Abstract An improvement in the process of alkaline catalyst removal from crude polyoxyalkylene ether polyols is achieved by treating a mixture of crude polyol, adsorbent, and water with carbon dioxide just prior to filtration.
Inventors
- 👤 John A. Muzzio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:42
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
In the process for purifying crude polyoxyalkylene ether polyols containing residual catalyst impurities, said polyols having a molecular weight range of 700 to about 26,000, the improvement which comprises: (a) adding an adsorbent consisting of synthetic magnesium silicate and water forming a mixture with said crude polyol wherein the amount of adsorbent is from about 0.5 to 3.0 weight percent based on the weight of the polyol and the amount of water is from about 2.0 to 3.0 weight percent based on the weight of the polyol, (b) heating said mixture at a temperature range from about 80° Centigrade to about 130° Centigrade for at least 45 minutes, (c) adding sufficient carbon dioxide to saturate the water 15 minutes prior to filtration, and (d) separating the polyol and the water from the adsorbent by filtration at a temperature from about 90° C. to about 120° C. wherein the residual catalyst impurities are retained on the adsorbent.
Claim 2
Dependent Claim
156 words
In the process for purifying crude polyoxyalkylene ether polyols containing residual catalyst impurities, said polyols having a molecular weight range of 700 to about 26,000, the improvement which comprises: (a) adding an adsorbent consisting of synthetic magnesium silicate and water forming a mixture with said crude polyol wherein the amount of adsorbent is from about 0.5 to 3.0 weight percent based on the weight of the polyol and the amount of water is from about 2.0 to 3.0 weight percent based on the weight of the polyol, (b) heating said mixture at a temperature range from about 80° Centigrade to about 130° Centigrade for at least 45 minutes, (c) adding sufficient carbon dioxide to saturate the water 15 minutes prior to filtration, and (d) separating the polyol and the water from the adsorbent by filtration at a temperature from about 90° C. to about 120° C. wherein the residual catalyst impurities are retained on the adsorbent.
Claim 3
Dependent Claim
65 words
The process of claim 1 wherein the polyols are prepared by condensing ethylene oxide, propylene oxide, butylene oxide and mixtures thereof with active hydrogen compounds selected from the groups consisting of ethylene glycol, propylene glycol, water, dipropylene glycol, trimethylolpropane, trimethylolethane, hydroquinone, pentaerythritol, alpha-methylglucoside, sorbitol, sucrose, ethylene diamine, diethylene triamine, toluene diamine, aniline, methylene dianiline, piperazine, triisopropanolamine, and bisphenol A said polyols being essentially water insoluble.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the amount of adsorbent is from about 1.0 to 3.0 weight percent based on the weight of the polyol.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the amount of adsorbent is from about 1.0 to about 2.0 weight percent based on the weight of the polyol.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the temperature of the mixture in step (b) is about 100 degrees Centigrade.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |