Activated carbon

Patent metadata

Field	Value
Publication number	US-11873235-B2
Application number	US-201917253154-A
Country	US
Kind code	B2
Filing date	Jun 18, 2019
Priority date	Jun 19, 2018
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

There is provided an activated carbon having a high total trihalomethane filtration capacity, even in water treatment by passing water at a high superficial velocity (SV). In the activated carbon of the present invention, a pore volume A of pores with a size of 1.0 nm or less, of pore volumes calculated by the QSDFT method, is 0.3 cc/g or more, and a pore volume B of pores with a size of 3.0 nm or more and 3.5 nm or less, of pore volumes calculated by the QSDFT method, is 0.009 cc/g or more.

First claim

The invention claimed is:

1. An activated carbon in which a pore volume A of pores with a size of 1.0 nm or less, of pore volumes calculated by the Quenched Solid Density Functional Theory (QSDFT) method, is between 0.30 and 0.50 cc/g, and
a pore volume B of pores with a size of 3.0 nm or more and 3.5 nm or less, of pore volumes calculated by the Quenched Solid Density Functional Theory (QSDFT) method, is between 0.009 and 0.025 cc/g.

2. The activated carbon according to claim 1 , wherein a pore volume C of pores with a size of 2.0 nm or more and 3.0 nm or less, of pore volumes calculated by the Quenched Solid Density Functional Theory (QSDFT) method, is 0.05 cc/g or less.

3. The activated carbon according to claim 1 , wherein a proportion of a pore volume (cc/g) of pores with a size of 1.5 nm or less, of pore volumes calculated by the Quenched Solid Density Functional Theory (QSDFT) method, relative to a total pore volume (cc/g) of the activated carbon calculated by the Quenched Solid Density Functional Theory (QSDFT) method, is 0.85 or more.

4. The activated carbon according to claim 1 , wherein the activated carbon has a specific surface area of 500 to 1800 m 2 /g.

5. The activated carbon according to claim 1 , wherein the activated carbon has a total trihalomethane filtration capacity of 45 L/g or more.

6. The activated carbon according to claim 1 , wherein the activated carbon is a fibrous activated carbon.

7. A method for producing the activated carbon according to claim 1 , comprising the step of activating an activated carbon precursor comprising 0.1 to 1.5% by mass of iron at a temperature of 900 to 1000° C. in an atmosphere having a CO 2 concentration of 90% by volume or more.

Assignees

• Adall Co Ltd
• Unitika Ltd
• Osaka Gas Chemicals Co Ltd
• Gas Chemicals Co Ltd

Inventors

• Nakano Tomoyasu
• Shimizu Hirokazu
• Kawachi Akinori
• Sakai Keiji

Classifications

• C02F1/283 Primary

  using coal, charred products, or inorganic mixtures containing them · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/30

  Processes for preparing, regenerating, or reactivating · CPC title

• C01B32/336

  characterised by gaseous activating agents · CPC title

• C02F2101/36

  containing halogen · CPC title