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US 2023/0390731 A1Published application
Carbonaceous material and method for producing same, and fluorine-containing organic compound removing material, water purification filter, and water purifier
AssigneeKuraray Co., Ltd.
InventorsShuichi ISHIDA, Kiyoto OTSUKA, Tetsuya HANAMOTO, Hiroe YOSHINOBU
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Abstract
One aspect of the present invention relates to a carbonaceous material that has a benzene adsorption amount of 30 to 60%, a vitamin B12 adsorption amount of more than 50.0 mg/g, and a micropore volume of mesopores of 0.13 to 0.30 cm3/g as calculated from a nitrogen adsorption isotherm by a BJH method.
Claims14
1:
- A carbonaceous material having a benzene adsorption amount of 30 to 60%, a vitamin B12 adsorption amount of more than 50.0 mg/g, and a micropore volume of mesopores of 0.13 to 0.30 cm3/g as calculated from a nitrogen adsorption isotherm by a BJH method.
2:
- The carbonaceous material according to claim 1, wherein a specific surface area calculated by a BET method from the nitrogen adsorption isotherm is 1200 to 2000 m2/g.
3:
- The carbonaceous material according to claim 1, wherein an average micropore diameter calculated from the nitrogen adsorption isotherm is 1.85 to 1.90 nm.
4:
- The carbonaceous material according to claim 1, wherein an electrical conductivity measured by powder resistance measurement under a load of 12 kN is 3 to 9 S/cm.
5:
- The carbonaceous material according to claim 1, wherein the carbonaceous material is derived from a plant-based carbonaceous precursor.
6:
- The carbonaceous material according to claim 5, wherein the plant-based carbonaceous precursor is a coconut shell.
7:
- The carbonaceous material according to claim 1, wherein
- removal performance of a fluorine-containing organic compound obtained under following measurement conditions is 12000 or more in Bed Volume,
- the measurement conditions:
- water (containing TOC of 1.2 ppm) adjusted to a PFOA concentration of 50±10 ppt and a PFOS concentration of 50±10 ppt is used as test water in a stainless steel column filled with a carbonaceous material and having a diameter of 6.2 mm, a height of 25.4 mm, and an internal volume of 0.77 mL, and under conditions of 7.2 mL/min and a space velocity (SV) of 560 hr−1, a removal performance is defined as an amount of water (Bed Volume) from the start of passing water to a breakthrough point, which is obtained when water is passed upflow and a point at which a removal rate becomes lower than 80% is defined as the breakthrough point.
1 more element
8:
- A method for producing the carbonaceous material according to claim 1 using a fluidized bed furnace, the method comprising introducing, separately from a fluidized gas introduced from a hearth, an oxygen-containing gas into the fluidized bed furnace so that an oxygen concentration in a total gas of the fluidized gas and the oxygen-containing gas is 0.004 to 1 vol %.
9:
- The method according to claim 8, wherein a water vapor concentration in the fluidized gas introduced from the hearth is 10 to 40 vol %.
10:
- The method according to claim 8, wherein
- the fluidized bed furnace includes a gas dispersion part on an upstream side in the fluidized bed furnace as viewed in a flow main direction Z of the fluidized gas, and
- the method comprises, when an upstream end position of the gas dispersion part in the direction Z is 0 (m), a downstream end position is t1 (m), and a position at which the oxygen-containing gas is introduced is t2 (m), introducing the oxygen-containing gas so as to satisfy a relationship of 0.5t1≤t2.
11:
- A water purification filter comprising:
- the carbonaceous material according to claim 1;
- and
- a fibrous binder,
- wherein the fibrous binder has a CSF value of 10 to 150 mL, and 4 to 10 parts by mass of the fibrous binder is contained with respect to 100 parts by mass of the carbonaceous material.
2 more elements
12:
- A water purifier comprising the carbonaceous material according to claim 1.
13:
- A water purifier comprising the water purification filter according to claim 11.
14:
- A fluorine-containing organic compound removing material comprising the carbonaceous material according to claim 1.