Copolyether ester polyol process
US-9840580-B2 · Dec 12, 2017 · US
Product recovery process in the filtration of polyether polyols
US9040754B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9040754-B2 |
| Application number | US-201214233018-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 17, 2012 |
| Priority date | Jul 19, 2011 |
| Publication date | May 26, 2015 |
| Grant date | May 26, 2015 |
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Abstract
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An improved method for recovering a purified polyether polyol comprising the steps of providing an aqueous solution of a polyether polyol containing an alkali metal catalyst residual formed from a transesterification process, contacting the aqueous solution with a stoichiometric excess of magnesium sulfate to form a second aqueous solution, removing water from said second aqueous solution at a temperature above the melt temperature of said polyether polyol to produce a dehydrated slurry containing a molten polyether polyol phase essentially free of residual alkali metal and a precipitated solid phase comprising sulfate and/or sulfite salts of the alkali metal catalyst, magnesium hydroxide, and excess magnesium sulfate and/or sulfide, passing the dehydrated slurry of through a filtration system comprising a filtration press to separate the molten polyether polyol phase from the precipitated solid phase, wherein the filtration press is treated with a filter aid that is essentially free of transition metal oxide content, separating the molten polyether polyol phase substantially free of water, residual alkali metal catalyst and transition metal contaminants from the precipitated solid phase and recovering polyether polyol from the separated polyether polyol phase.
First claim
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What is claimed is: 1. A method for recovering a purified polyether polyol comprising the steps of: (a) providing an aqueous solution of a polyether polyol containing an alkali metal catalyst residual formed from a transesterification process utilizing an alkali metal catalyst; (b) contacting the aqueous solution of step (a) with a stoichiometric excess of magnesium sulfate, magnesium sulfite or a combination thereof to form a second aqueous solution, wherein said stoichiometric…
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- What does patent US9040754B2 cover?
- An improved method for recovering a purified polyether polyol comprising the steps of providing an aqueous solution of a polyether polyol containing an alkali metal catalyst residual formed from a transesterification process, contacting the aqueous solution with a stoichiometric excess of magnesium sulfate to form a second aqueous solution, removing water from said second aqueous solution at a …
- Who is the assignee on this patent?
- Osborne Robert B, Quon Willard L, Invista North America Sarl
- What technology area does this patent fall under?
- Primary CPC classification C08G65/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 26 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).