Patent US3966384A successfully refreshed from Google Patents.
Patent US4507475A successfully refreshed from Google Patents.
US4507475A
Expired / Lapsed
US
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Process for purification of crude polyether polyols
Assignee: BASF SE
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Filing: 1983-07-22
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Granted: 1985-03-26
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Expires: 2003-07-22
Abstract
Abstract A process for purifying crude polyether polyols which are prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts. The polyols are mixed with water and ortho-phosphoric acid in certain quantity ratios, an adsorption agent is incorporated in the reaction mixture, the mixture is filtered and the water is removed from the polyether polyol by distillation.
Inventors
- 👤 Wolfgang Straehle
- 👤 Raymond Denni
- 👤 Matthias Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:31
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A process for the purification of crude polyether polyols prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts and subsequent neutralization of the catalysts with mineral acid wherein the (a) crude polyether polyol is mixed with 0.2 to 1.5 parts by weight of water per 100 parts by weight of crude polyether polyol, and 0.3 to 1.1 moles of ortho-phosphoric acid per mole of alkaline catalyst, (b) 0.05 to 0.5 parts by weight of an adsorption agent per 100 parts by weight of crude polyether polyol are subsequently incorporated in the reaction mixture, (c) the resultant salts and solid additives are separated, and (d) the water is removed from the polyether polyol.
Claim 2
Dependent Claim
116 words
A process for the purification of crude polyether polyols prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts and subsequent neutralization of the catalysts with mineral acid wherein the (a) crude polyether polyol is mixed with 0.2 to 1.5 parts by weight of water per 100 parts by weight of crude polyether polyol, and 0.3 to 1.1 moles of ortho-phosphoric acid per mole of alkaline catalyst, (b) 0.05 to 0.5 parts by weight of an adsorption agent per 100 parts by weight of crude polyether polyol are subsequently incorporated in the reaction mixture, (c) the resultant salts and solid additives are separated, and (d) the water is removed from the polyether polyol.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the crude polyether polyol is mixed with water and phosphoric acid at temperatures of 50° C. to 140° C. and optionally under increased pressure.
Claim 4
Dependent Claim
42 words
The process of claim 1 wherein the reaction mixture of polyether polyol, water and phosphoric acid is agitated at temperatures of 50° C. to 140° C. for 0.1 to 4 hours and the adsorption agent is subsequently incorporated in the reaction mixture.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein magnesium silicate is used as adsorption agent.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the resultant salts and incorporated solid additives are separated by filtration.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the filtration is carried out in the presence of a filtering aid.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein substituted alkylene oxides with 2 to 4 carbon atoms in the alkylene radical are used for the polymerization.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein ethylene oxide and/or propylene oxide are used as the alkylene oxides.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein alkali hydroxides are used as the alkaline catalysts.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |