EP0283298A2
Expired / Lapsed
EP
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Purification of polyols prepared using double metal cyanide complex catalysts
Assignee: Lyondell Chemical Technology LP
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Filing: 1988-03-18
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Granted: —
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Expires: 2008-03-18
Abstract
Abstract A method for removing double metal cyanide complex catalyst residue from polyols using alkali metal hydrides is disclosed. In one embodiment, the catalyst residue is converted into an insoluble ionic metal species and separated by filtration using magnesium or aluminum silicate to facilitate separation.
Inventors
- 👤 Stephen D. Harper
- 👤 Stephen H. Harris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C07; C07C; C07C41/00; C07C41/01; C07C41/34; C07C41/44; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G65/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A method for removing double metal cyanide complex catalyst residue from polyols which comprises after polyol formation the steps of: (a) incorporating into the catalyst residue-containing polyol an effective amount of an alkali metal hydride to convert the double metal cyanide complex catalyst into an insoluble ionic metal species separable from the polyol wherein the polyol hydroxyl groups are also converted to alkoxide groups; and (b) separating the insoluble ionic metal species from the polyol.
Claim 2
Independent Claim
75 words
A method for removing double metal cyanide complex catalyst residue from polyols which comprises after polyol formation the steps of: (a) incorporating into the catalyst residue-containing polyol an effective amount of an alkali metal hydride to convert the double metal cyanide complex catalyst into an insoluble ionic metal species separable from the polyol wherein the polyol hydroxyl groups are also converted to alkoxide groups; and (b) separating the insoluble ionic metal species from the polyol.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which said separating is accomplished by filtration.
Claim 4
Dependent Claim
28 words
The method of claim 1 in which said separating is accomplished by passing the mixture of catalyst residue-containing polyol and alkali metal hydride through an ion exchange resin.
Claim 5
Independent Claim
26 words
The method of any one of claims 1 to 3 in which said alkali metal hydride is one or more of sodium hydride and potassium hydride.
Claim 6
Independent Claim
33 words
The method of any preceding claim in which said alkali metal hydride is employed in a molar ratio of alkali metal hydride to hydroxyl groups on the polyol of from 1:1 to 1:500.
Claim 7
Independent Claim
35 words
The method of any preceding claim wherein the mixture of catalyst residue-containing polyol and alkali metal hydride prepared in step (a) is heated to enhance the speed at which the insoluble ionic metal species forms.
Claim 8
Independent Claim
45 words
The method of any preceding claim comprising after step (a) and before step (b) the step of incorporating an effective amount of ethylene oxide into the catalyst residue-containing polyol/alkali metal hydride mixture to convert any secondary hydroxyl groups of the polyol to primary hydroxyl groups.
Claim 9
Independent Claim
39 words
The method of any preceding claim wherein a minor amount of one or more of magnesium-silicate and aluminum-silicate is introduced into the mixture and the insoluble ionic metal species is separated from the polyol in step (b) by filtration.
Claim 10
Independent Claim
79 words
A method for removing double metal cyanide complex catalyst residue from polyols after polyol formation which comprises: (a) incorporating into the catalyst residue-containing polyol an effective amount of an alkali metal dispersion to convert the double metal cyanide complex catalyst into an insoluble metal species separable from the polyol; (b) adding a minor amount of one or more of magnesium silicate or aluminum silicate to the mixture; (c) separating the insoluble ionic metal species from the polyol by filtration.
Claim 11
Independent Claim
79 words
A method for removing double metal cyanide complex catalyst residue from polyols after polyol formation which comprises: (a) incorporating into the catalyst residue-containing polyol an effective amount of an alkali metal dispersion to convert the double metal cyanide complex catalyst into an insoluble metal species separable from the polyol; (b) adding a minor amount of one or more of magnesium silicate or aluminum silicate to the mixture; (c) separating the insoluble ionic metal species from the polyol by filtration.
Claim 12
Dependent Claim
12 words
A method according to claim 9 wherein the alkali metal is sodium.
References Cited (Backward Citations)
No citation records indexed.
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