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Activated carbon fiber sheet for automobile adsorption tank

A technology of activated carbon fiber and adsorption tank, which is applied in the field of activated carbon fiber sheets, can solve the problems such as gasoline is difficult to desorb, and achieve the effects of high adsorption and desorption performance, excellent adsorption and desorption performance, and easy disposal

Active Publication Date: 2020-12-29
NIPPON PAPER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the popularization of idling stop and the like, the air intake capacity of automobiles tends to be suppressed, so it tends to be difficult to desorb gasoline adsorbed on the adsorbent in the canister.

Method used

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  • Activated carbon fiber sheet for automobile adsorption tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 2

[0104]

[0105] An activated carbon fiber sheet for an automobile canister that further satisfies the following requirement (4) in addition to the requirements (1) to (3) of Embodiment 1.

[0106] (4) The total pore volume is 0.50~1.20cm 3 / g.

[0107] From the viewpoint of ensuring the adsorption capacity required for the adsorption canister, the sheet material of a more preferable embodiment can be obtained by satisfying the above requirements (1) to (3) and satisfying the requirement (4).

[0108] 2. Adsorption tank

[0109] The activated carbon fiber sheet of the present invention is suitable as an adsorption material contained in an automobile adsorption tank. That is, as another embodiment, the present invention may also provide an automobile canister.

[0110] The automobile adsorption tank of the present invention is equipped with an activated carbon fiber sheet as an adsorption material. The structure of the automobile adsorption tank is not particularly limited...

Embodiment approach 1

[0129] Carbonizing and activating the raw material sheet holding either or both of the phosphoric acid-based catalyst or the organic sulfonic acid-based catalyst; and

[0130] Pressurizing so that the density of the activated carbon fiber sheet becomes 0.030 to 0.200 g / cm 3 .

[0131] 3-1. Preparation of raw material sheet (precursor)

[0132]

[0133] Examples of fibers constituting the raw material sheet include cellulose-based fibers, pitch-based fibers, PAN-based fibers, phenol resin-based fibers, and the like, preferably cellulose-based fibers.

[0134]

[0135] Cellulosic fibers are fibers composed mainly of cellulose and / or derivatives thereof. The cellulose and cellulose derivatives may be any of chemically synthesized, plant, regenerated cellulose, cellulose produced by bacteria, and the like. As the cellulose-based fibers, for example, fibers formed from plant-based cellulose substances obtained from trees and the like, and fibers obtained by chemically treati...

Embodiment 1

[0220] The weight per square meter formed by rayon fibers (1.7dtex, fiber length 40mm) is 300g / m 2 The needle-punched non-woven fabric is impregnated with 5 to 8% diammonium hydrogen phosphate aqueous solution, wrung out the liquid, and then dried to allow 8 to 10% by weight to adhere. While pressurizing the obtained pretreated nonwoven fabric, the temperature was raised to 900° C. in a nitrogen atmosphere over 50 minutes, and this temperature was maintained for 4 minutes. Next, at this temperature, an activation treatment was performed for 10 minutes in a nitrogen stream containing water vapor having a dew point of 60°C.

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Abstract

The present invention addresses the problem of providing a new form of adsorbent that is suitable for canisters mounted on automobiles. The activated carbon fiber sheet satisfies one or more of requirements among various indicators such as specific surface area, volume of pores having a predetermined pore diameter, and sheet density. For example, an embodiment of the activated carbon fiber sheet may have a specific surface area of 1400 to 2200 m2 / g, a pore volume of pores having a pore diameter of greater than 0.7 nm and 2.0 nm or less of 0.20 to 1.20 cm3 / g, and a sheet density of 0.030 to 0.200 g / cm3.

Description

technical field [0001] The present invention relates to an activated carbon fiber sheet. Specifically, it relates to an activated carbon fiber sheet suitable for use in canisters of automobiles. Background technique [0002] In gasoline vehicles, the pressure inside the fuel tank fluctuates along with changes in the outside air temperature, and the evaporative fuel gas filled in the fuel tank is released from the fuel tank. The released evaporative fuel gas is one of the causative substances of PM2.5 and photochemical smog, and in order to prevent it from being released into the atmosphere, an adsorption tank equipped with adsorption materials such as activated carbon is installed. (Hereinafter, in this specification, a canister mounted on an automobile may be simply referred to as an "automotive canister" or just a "canister".) [0003] In recent years, with the increasing awareness of environmental protection, gas emission restrictions tend to be strengthened year by year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08B01J20/20B01J20/28B01J20/30B01J27/16B01J35/10B01J37/00B01J37/08C01B32/30C01B32/312D01F9/16
CPCB01J20/20C01B32/318D01F9/16B01J27/14B01J27/02B01J35/06C01P2006/12C01P2006/14C01P2006/90C01P2006/10C01B32/336C01B32/354C01P2006/16C01B32/306F02M25/0854B01J20/28038B01J20/28066B01J20/28069B01J20/3078B01J20/3085B01J20/28011B01J20/2808B01J2220/4825B01J20/28B01J20/30B01J27/16B01J35/10B01J37/08C01B32/30C01B32/312F02M25/08
Inventor 今井大介渡边佳英高田由生小泽骏介芳田千惠藤野谦一
Owner NIPPON PAPER IND CO LTD
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