Back to results
US 12,427,486 B2Granted
Alkali-stable nanofiltration composite membrane and method of manufacture thereof
AssigneeBl Technologies, Inc.
InventorsZedda Karina, Carsten Schellenberg, Judith Richter
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention relate to a nanofiltration composite membrane for use to purify water, the methods for preparing said nanofiltration composite membranes and to the nanofiltration composite membranes prepared accordingly.
Claims16
A process for preparation of a nanofiltration composite membrane, comprising steps of:
- a.) solving at least one polymer selected from the group consisting of polysulfone polymer, polyether polymer and mixtures thereof and at least one polyvinyl pyrrolidone polymer in at least one aprotic solvent to prepare a casting solution;
- and
- b.) casting the casting solution of step a.) on a non-woven fabric to prepare a casted non-woven fabric;
- and
- c.) bringing the casted non-woven fabric of step b.) into contact with a polar non-solvent to prepare a casted non-woven fabric membrane;
- and
- d.) bringing the casted non-woven fabric membrane of step c.) into contact with at least one radical polymerization initiator;
- and
- e.) washing the casted non-woven fabric membrane of step d.) with a non-solvent;
- and
- f.) cross-linking the casted non-woven fabric membrane of step e.) to prepare said nanofiltration composite membrane;
- wherein the nanofiltration composite membrane has an average molecular weight cut-off between 200 g/mol to 1000 g/mol.
9 more elements
A process for preparation of a nanofiltration composite membrane, comprising steps of:
- a.) solving at least one polymer selected from the group consisting of polysulfone polymer, polyether polymer and mixtures thereof and at least one polyvinyl pyrrolidone polymer in at least one aprotic solvent to prepare a casting solution;
- and
- b.) casting the casting solution of step a.) on a non-woven fabric to prepare a casted non-woven fabric;
- and
- c.) bringing the casted non-woven fabric of step b.) into contact with a polar non-solvent to prepare a casted non-woven fabric membrane;
- and
- d.) bringing the casted non-woven fabric membrane of step c.) into contact with at least one radical polymerization initiator;
- and
- e.) washing the casted non-woven fabric membrane of step d.) with a non-solvent;
- and
- f.) cross-linking the casted non-woven fabric membrane of step e.) to prepare said nanofiltration composite membrane;
- wherein a weight per unit area of the non-woven fabric is 70 to 100 g/m2.
9 more elements
A process for preparation of a nanofiltration composite membrane, comprising steps of:
- a.) solving at least one polymer selected from the group consisting of polysulfone polymer, polyether polymer and mixtures thereof and at least one polyvinyl pyrrolidone polymer in at least one aprotic solvent to prepare a casting solution;
- and
- b.) casting the casting solution of step a.) on a non-woven fabric to prepare a casted non-woven fabric;
- and
- c.) bringing the casted non-woven fabric of step b.) into contact with a polar non-solvent to prepare a casted non-woven fabric membrane;
- and
- d.) bringing the casted non-woven fabric membrane of step c.) into contact with at least one radical polymerization initiator;
- and
- e.) washing the casted non-woven fabric membrane of step d.) with a non-solvent;
- and
- f.) cross-linking the casted non-woven fabric membrane of step e.) to prepare said nanofiltration composite membrane;
- wherein a total amount of polymer used in step a.) is 10% weight to 22% weight based on an amount of the casting solution.
9 more elements
Dependencies are inferred from the claim text.