Adsorbent for canister

Patent metadata

Field	Value
Publication number	US-12138577-B2
Application number	US-202217667106-A
Country	US
Kind code	B2
Filing date	Feb 8, 2022
Priority date	Aug 21, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

An object is to provide a new form of adsorbent suitable for a high performance canister. An adsorbent including activated carbon is used as the adsorbent for the canister and satisfies the following conditions. P 0.2/100 expressed by Equation 1:

P 0.2/100 =X÷Y ×100  (Equation 1)

is 18% or more, in Equation 1, X represents an amount of adsorbed n-butane gas per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 0.2 kPa, and Y represents an amount of adsorbed n-butane gas per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 100 kPa.

First claim

What is claimed is:

1. An adsorbent comprising: activated carbon, the adsorbent being used for a canister, and having P 0.2/100 of 18% or more, wherein
P 0.2/100 is expressed by Equation 1:
P 0.2/100 =X÷Y× 100  (Equation 1),

in Equation 1, X represents an amount of adsorbed n-butane gas (unit: parts by weight) per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 0.2 kPa, and
Y represents an amount of adsorbed n-butane gas (unit: parts by weight) per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 100 kPa.

2. The adsorbent according to claim 1 , wherein P 0.2/100 is 21% or more.

3. The adsorbent according to claim 1 , wherein
P 100/50 expressed by Equation 2:
P 100/50 =Y÷Z× 100  (Equation 2)

is 120% or less,
in Equation 2, Z represents an amount of adsorbed n-butane gas (unit: parts by weight) per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 50 kPa, and
Y is the same as Y in Equation 1.

4. The adsorbent according to claim 3 , wherein P 100/50 is 115% or less.

5. The adsorbent according to claim 1 , wherein a specific surface area of the adsorbent is 2500 m 2 /g or less.

6. The adsorbent according to claim 1 , wherein a total pore volume of the adsorbent ranges from 0.50 to 1.20 cm 3 .

7. The adsorbent according to claim 1 , wherein an average pore size of the adsorbent ranges from 1.50 to 2.00 nm or less.

8. The adsorbent according to claim 1 , wherein a density of the adsorbent ranges from 0.010 to 0.200 g/cm 3 .

9. The adsorbent according to claim 1 , wherein the adsorbent is a formed product of activated carbon fiber.

10. The adsorbent according to claim 1 , wherein the adsorbent is for a canister to be used in a motor vehicle.

11. A canister comprising:
the adsorbent according to claim 1 .

12. The canister according to claim 11 , wherein
the canister is a canister for a motor vehicle and comprises a main chamber and an auxiliary chamber that each store an adsorbent,
the auxiliary chamber has a volume to store the adsorbent, the volume being smaller than that of the main chamber, and the auxiliary chamber is arranged at a position closer to an opening connected to outside air, compared to the main chamber, and
the adsorbent is stored in the auxiliary chamber.

13. A canister comprising:
the adsorbent according to claim 3 .

14. The canister according to claim 13 , wherein
the canister is a canister for a motor vehicle and comprises a main chamber and an auxiliary chamber that each store an adsorbent,
the auxiliary chamber has a volume to store the adsorbent, the volume being smaller than that of the main chamber, and the auxiliary chamber is arranged at a position closer to an opening connected to outside air, compared to the main chamber, and
the adsorbent is stored in the auxiliary chamber.

Assignees

• Jujo Paper Co Ltd

Inventors

• Imai Daisuke
• Watanabe Yoshihide
• Takata Yuu
• Ozawa Shunsuke
• Yoshida Chie

Classifications

• F02M25/0854

  Details of the absorption canister · CPC title

• D01F9/16

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• B01J20/2808

  being less than 2 nm, i.e. micropores or nanopores · CPC title

• B01J20/28076

  being more than 1.0 ml/g · CPC title

• B01J20/28073

  being in the range 0.5-1.0 ml/g · CPC title