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US 10,245,559 B2Granted
Nanofiltration membranes and methods of use
AssigneeNovomer, Inc.
InventorsRobert E. Lapointe, Scott D. Allen, Han Lee, Thomas Widzinski, Jay J. Farmer
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Abstract
The present invention provides nanofiltration membranes with reduced chemical reactivity that can be utilized in manufacturing processes where reactive feedstocks and/or products are utilized or produced. Methods of making and using the membranes are also provided.
Claims9
A method of removing catalyst from a process of carbonylating epoxide, comprising:
- a) contacting epoxide with carbon monoxide in the presence of a homogenous carbonylation catalyst to provide a process stream comprising beta lactone and the homogenous catalyst;
- b) flowing the process stream over a nanofiltration membrane to provide a permeate stream comprising beta lactone and a retentate stream comprising homogenous catalyst;
- and
- c) returning the retentate stream to step (a),
- wherein the concentration of the catalyst in the retentate stream is higher than the catalyst concentration in the permeate stream, and
- wherein the nanofiltration membrane comprises a polysiloxane polymer, wherein the polysiloxane polymer is treated with a reagent reactive toward —OH groups.
3 more elements
Dependencies are inferred from the claim text.