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US 12,486,619 B2Granted
Membrane separation process for vinylamine-containing polymers
AssigneeSolenis Technologies, L.P.
InventorsCecil Coutinho, Sachin Borkar, Shantanu Nikam
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Abstract
Provided is a method for the removal of salts and by-products from vinylamine-containing polymers. In particular, the method allows the removal of unwanted salts, by-products, spent initiators and short chain vinylamine-containing polymers while retaining the functional, higher molecular weight polymers that provide for desired product performance.
Claims9
A method of removing salts, by-products, and low molecular weight polymers from a solution of vinylamine-containing polymer comprising;
- providing the solution of vinylamine-containing polymer, wherein the polymer comprises salts and by-products formed during vinylamine-containing polymer synthesis and/or modification of a vinylamine-containing polymer solution;
- circulating the solution through a nanofiltration membrane and/or an ultrafiltration membrane having a molecular cutoff of from about 500 Dalton to 1,000 Dalton, thereby separating a low molecular weight from a high molecular weight retentate of the vinylamine-containing polymer and at least a portion of the salts and by-products;
- and
- collecting a vinylamine-containing polymer retentate having a weight average molecular weight of from about 10,000 to about 1,000,000 Da. and a reduced amount of salts and by-products as compared to the solution prior to circulating through the nanofiltration membrane and/or an ultrafiltration membrane.
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A method of preparing a solution of high molecular weight vinylamine-containing polymers comprising,
- providing a solution of vinylamine-containing polymer wherein the polymer comprises one or more of a salt or a by-product formed during vinylamine-containing polymer synthesis and/or modification of vinylamine containing polymer comprising a low molecular weight vinylamine polymer component and a high molecular weight vinylamine polymer component;
- circulating the solution through a nanofiltration and/or ultrafiltration membrane having a molecular weight cut-off of from about 500 Dalton to 1000 Dalton, thereby separating a fraction of low molecular weight vinylamine-containing polymer from a retentate having a weight average molecular weight of from about 10,000 to about 1,000,000 Da.;
- and
- collecting the retentate of the higher molecular vinylamine containing polymer, wherein the weight average molecular weight of the collected fraction of the higher molecular vinylamine-containing polymer is from about 10,000 to about 1,000,000 Da.
1 more element
Dependencies are inferred from the claim text.