Monovalent anion selective ion exchange membrane
AssigneeToray Advanced Materials Korea Inc.
InventorYoung Woo Choi
Life of this patent
Estimating the term…
Abstract
Provided are a monovalent anion selective ion exchange membrane and a method of manufacturing the ion exchange membrane. In regard to the monovalent anion selective ion exchange membrane, a surface portion thereof has a high amount ratio of a cation exchange polymer electrolyte, a central portion thereof has a high amount ratio of an anion exchange polymer electrolyte, and an amount ratio of the anion exchange polymer electrolyte with respect to the cation exchange polymer electrolyte continuously increases in the thickness direction thereof from the surface toward the center. Due to this structure, compared to monovalent anions, polyvalent anions may permeate much less through the exchange membrane. Thus, high selectivity for monovalent anions may be obtained.
Claims12
A monovalent anion selective ion exchange membrane, comprising:
- a polymer support having a porous structure;
- and
- an ion exchange polymer electrolyte impregnated in the porous polymer support,
- wherein the ion exchange polymer electrolyte includes an anion exchange polymer electrolyte and a cation exchange polymer electrolyte,
- a central portion of the porous polymer support is impregnated with the anion exchange polymer electrolyte,
- a surface portion of the porous polymer support is impregnated with a cation exchange polymer electrolyte, and
- the porous polymer support has a pore volume of 40% to 50%, a pore size of 0.07 μm to 0.1 μm, and a thickness of 8 μm to 30 μm.
A method of manufacturing a monovalent anion selective ion exchange membrane, the method comprising:
- impregnating a porous polymer support with an anion exchange precursor solution comprising an electrolyte monomer having a cationic group, a crosslinking agent, an initiator, and a solvent;
- forming an anion exchange polymer electrolyte in a central portion of the porous polymer support by irradiating light to the porous polymer support to cause a crosslinking reaction of the anion exchange precursor solution;
- impregnating the porous polymer support having the anion exchange polymer electrolyte formed therein, with a cation exchange precursor solution including an electrolyte monomer having an anionic group, a crosslinking agent, an initiator, and a solvent;
- and
- forming a cation exchange polymer electrolyte on the surface portion of the porous polymer support by irradiating light to the porous polymer support impregnated with the cation exchange precursor solution, to cause a crosslinking reaction of the cation exchange precursor solution,
- wherein the porous polymer support is hydrophilized by a surfactant before being impregnated with the anion exchange precursor solution.
Dependencies are inferred from the claim text.