Patent US4029879A successfully refreshed from Google Patents.
US4029879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of catalysts from polyether polyols employing water and adsorbent
Assignee: BASF Corp
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Filing: 1975-11-17
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Granted: 1977-06-14
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Expires: 1995-11-17
Abstract
Abstract An improvement in the process of catalyst removal in the preparation of polyether polyols is achieved by adding a critical amount of water from about 1 to about 5 percent by weight based on the weight of polyol to an adsorbent synthetic magnesium silicate-polyol mixture followed by filtration to remove the adsorbent.
Inventors
- 👤 John A. Muzzio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:48
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
In the process for purifying polyoxyalkylene ether polyols containing residual catalyst impurities, said polyols having a molecular weight range of 300 to about 26,000, the improvement which comprises: 1. providing a mixture of water, said polyol and an adsorbent consisting of synthetic magnesium silicate, wherein the amount of water is from about 1.0 to about 5.0 weight percent based on the weight of the polyol, 2. heating said mixture at a temperature range from about 80° Centigrade to about 130° Centigrade, and 3. separating the polyol from the water and the adsorbent by filtration wherein the residual catalyst impurities are retained in the adsorbent.
Claim 2
Dependent Claim
104 words
In the process for purifying polyoxyalkylene ether polyols containing residual catalyst impurities, said polyols having a molecular weight range of 300 to about 26,000, the improvement which comprises: 1. providing a mixture of water, said polyol and an adsorbent consisting of synthetic magnesium silicate, wherein the amount of water is from about 1.0 to about 5.0 weight percent based on the weight of the polyol, 2. heating said mixture at a temperature range from about 80° Centigrade to about 130° Centigrade, and 3. separating the polyol from the water and the adsorbent by filtration wherein the residual catalyst impurities are retained in the adsorbent.
Claim 3
Dependent Claim
64 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, trimethylene glycol, butanediol, hexanetriol, glycerol, trimethylolpropane, trimethylolethane, hydroquinone, pentaerythritol, alpha-methylglucoside, sorbitol, sucrose, ethylene diamine, diethylene triamine, toluene diamine, aniline, methylene dianiline, piperazine, triisopropanolamine and bisphenol A.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the water is added after the polyol and the adsorbent have been heat treated.
Claim 5
Dependent Claim
26 words
The process of claim 1 wherein the amount of adsorbent is from about 0.5 to about 5.0 weight percent based on the weight of the polyol.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the amount of water is from about 2.0 to about 3.3 weight percent based on the weight of the polyol.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the amount of adsorbent is from about 1.0 to about 3.0 weight percent based on the weight of the polyol.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the mixture is heat treated from about 0.5 hour to about 5 hours.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |