Ion exchanger
AssigneeOrgano Corporation
InventorsHiroshi Inoue, Koji Yamanaka, Makio Tamura, Shusaku Yoshida, Hideo Nakamura
Life of this patent
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Abstract
A porous ion exchanger includes an open cell structure including interconnected macropores and mesopores whose average diameter is in a range of 1 to 1000 μm existing on walls of the macropores. Moreover, a total pore volume is in a range of 1 to 50 ml/g, ion exchange groups are uniformly distributed, and an ion exchange capacity is not less than 0.5 mg equivalent/g of dry porous ion exchanger. The porous ion exchanger can be used as an ion exchanger filled into a deionization module of an electrodeionization water purification device, solid acid catalyst, adsorbent, and filler for chromatography.
Claims18
A porous ion exchanger having many macropores therein, wherein:
- the macropores have an open cell structure in which the macropores are interconnected via mesopores,
- the mesopores have an average diameter of 1 to 1000 μm,
- a total pore volume is in a range of 1 to 50 ml/g,
- ion exchange groups are substantially uniformly distributed, and
- an ion exchange capacity is not less than 0.5 mg equivalent/g of dry porous ion exchanger.
A method for manufacturing a porous ion exchanger having many macropores therein, comprising the steps of:
- mixing an oil-soluble monomer and water to form a water-in-oil type emulsion in which water droplets are dispersed in an oil phase;
- and
- polymerizing the monomer in the water-in-oil type emulsion to form a porous material in which the macropores interconnected to one another via mesopores have an open cell structure and an average diameter of the mesopores is in a range of 1 to 1000 μm.
A porous ion exchanger having many macropores therein, wherein:
- the macropores have an open cell structure in which the macropores are interconnected via mesopores,
- the mesopores have an average diameter of 1 to 1000 μm, and
- the porous ion exchanger further comprising micropores as non-continuous pores having an average pore diameter of 5 to 800 nm and existing on inner walls which define the respective pores.
A method for manufacturing a porous ion exchanger having many macropores therein, comprising the steps of:
- mixing an oil-soluble monomer, a precipitant which is a poor solvent with respect to a polymer obtained by polymerizing the oil-soluble monomer and which dissolves the oil-soluble monomer, a surface-active agent, and water to form a water-in-oil type emulsion in which water droplets are dispersed in an oil phase;
- polymerizing the monomer in the water-in-oil type emulsion to form a porous material;
- and
- introducing an ion exchange group into the formed porous material to manufacture the ion exchanger including an open cell structure in which the macropores are interconnected via mesopores and an average diameter of the mesopores is in a range of 1 to 1000 μm, and further including micropores as non-continuous pores having an average pore diameter of 5 to 800 nm and existing on inner walls which define the respective pores.
Dependencies are inferred from the claim text.