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Nanofiltration membranes and methods of use

  • US 10,245,559 B2
  • Filed: 06/07/2016
  • Issued: 04/02/2019
  • Est. Priority Date: 12/07/2013
  • Status: Active Grant
First Claim
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1. 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, andwherein the nanofiltration membrane comprises a polysiloxane polymer, wherein the polysiloxane polymer is treated with a reagent reactive toward —

    OH groups.

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