US4482750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing alkaline catalysts from polyether polyols
Assignee: Bayer AG
•
Filing: 1982-12-22
•
Granted: 1984-11-13
•
Expires: 2002-12-22
Abstract
Abstract A process for removing alkali material from a polyether polyol. From 1-20 wt. % water and 0-30 wt. % inert organic solvent are added to an alkaline polyether polyol. The resultant emulsion is maintained at a temperature of at least 70° C. for a period of at least 30 minutes with little or no stirring to effect separation of the emulsion into an organic and an aqueous phase. The aqueous phase is then separated from the organic phase and the organic phase is treated by known methods to remove residual alkali material.
Inventors
- 👤 Hartmut Hetzel
- 👤 Pramod Gupta
- 👤 Roland Nast
- 👤 Herbert Echterhof
- 👤 Ulrich Brocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:49
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30; C08G18/00; C08G18/06; C08G18/28; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2609; C08G65/2642; C08G65/2645; C08G65/2648
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A process for removing alkali material from a polyether polyol produced by base-catalyzed polyaddition of an alkylene oxide, comprising: (a) adding from 1 to 20 percent by weight of water and from 0 to 30 percent by weight of an inert, organic solvent to the alkaline polyether polyol to form an emulsion; (b) maintaining the thus-formed emulsion at a temperature of at least 70° C. for at least 30 minutes with little or no stirring to destabilize the emulsion and thereby promote separation of the emulsion into an organic and an aqueous phase; (c) separating the aqueous phase from the organic phase by passing the emulsion through a sheet-formed structure made of fine fibers, which sheet structure has a weight per unit area of from 100 to 10,000 g/m 2 and a thickness of from 1 to 100 mm; and (d) removing residual alkaline material from the organic phase.
Claim 2
Dependent Claim
149 words
A process for removing alkali material from a polyether polyol produced by base-catalyzed polyaddition of an alkylene oxide, comprising: (a) adding from 1 to 20 percent by weight of water and from 0 to 30 percent by weight of an inert, organic solvent to the alkaline polyether polyol to form an emulsion; (b) maintaining the thus-formed emulsion at a temperature of at least 70° C. for at least 30 minutes with little or no stirring to destabilize the emulsion and thereby promote separation of the emulsion into an organic and an aqueous phase; (c) separating the aqueous phase from the organic phase by passing the emulsion through a sheet-formed structure made of fine fibers, which sheet structure has a weight per unit area of from 100 to 10,000 g/m 2 and a thickness of from 1 to 100 mm; and (d) removing residual alkaline material from the organic phase.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein from 2 to 10% by weight of water are added to the alkaline polyether polyol in step (a).
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the inert organic solvent is toluene.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the emulsion is maintained at a temperature of from 85° to 130° C. in step (b).
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the fibers of the sheet-form structure have a thickness of less than 50 μm.
Claim 7
Dependent Claim
17 words
The process of claim 7 wherein the fibers have a thickness of from 1 to 10 μm.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the rate of flow of the emulsion through the fibrous sheet-form structure is from 1 to 20 m/h.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the sheet-form structure is made of metal or mineral fibers.
Claim 10
Dependent Claim
36 words
The process of claim 1 wherein step (d) comprises: adding an acid or an adsorbent material to the organic phase, filtering the resultant mixture, and distilling off any remaining water and organic solvent from the filtrate.
References Cited (Backward Citations)
US3299151A
Cited
GB1082810A
Cited
US3489680A
Cited
US3823145A
Cited
US3582491A
Cited
US4240908A
Cited
US4322312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |