Activated carbon fiber sheet for automobile adsorption tank

A technology of activated carbon fiber and adsorption tank, which is applied to the chemical characteristics of fibers, motor vehicles, carbon compounds, etc., can solve the problems of difficult desorption of gasoline, and achieve the effect of high adsorption and desorption performance, excellent adsorption and desorption performance, and easy disposal.

Pending Publication Date: 2022-03-25
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 1

[0128] 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

[0129] In order to make the density of the activated carbon fiber sheet become 0.030~0.200g / cm 3 way to adjust.

[0130] 3-1. Preparation of raw material sheet (precursor)

[0131]

[0132] Examples of fibers constituting the raw material sheet include cellulose-based fibers, pitch-based fibers, PAN-based fibers, phenolic resin-based fibers, and preferably cellulose-based fibers.

[0133]

[0134] 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 treating p...

Embodiment 1

[0232] The weight per square meter formed by rayon fibers (17.0dtex) is 300g / m 2 The needle-punched nonwoven fabric is impregnated with 6-10% diammonium hydrogen phosphate aqueous solution, wrung out the liquid, and then dried to allow 8-10% by weight to adhere. The obtained pretreated nonwoven fabric was heated up to 900° C. in a nitrogen atmosphere over 50 minutes, and kept at this temperature for 4 minutes. Next, at this temperature, activation treatment was performed for 18 minutes in a nitrogen stream containing water vapor having a dew point of 71°C.

Embodiment 2

[0234] Use a rayon fiber (7.8dtex) with a weight per square meter of 300g / m 2 The activated carbon fiber sheet of Example 2 was produced by the same method as in Example 1 except that.

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Abstract

The present invention addresses the problem of providing a novel adsorbent suitable for being mounted in a canister of an automobile. The activated carbon fiber sheet satisfies one or more requirements among various indexes such as specific surface area, volume of pores having a prescribed pore diameter, and sheet density. For example, an active carbon fiber sheet having a specific surface area of 1400-2300 m2 / g, a pore volume of pores having a pore diameter of more than 0.7 nm and 2.0 nm or less of 0.20-0.70 cm3 / g, an existence ratio (R0.7 / 2.0) of the pore volume of pores having a pore diameter of 0.7 nm or less to the pore volume of pores having a pore diameter of 2.0 nm or less of 5% or more and less than 25%, and a sheet density of 0.020-0.200 g / cm3 may be one embodiment.

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 as a canister for 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 causes of PM2.5 and photochemical smog, and in order to prevent it from being released into the atmosphere, an adsorption tank equipped with adsorbent 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. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08D06C7/04
CPCF02M25/0854D06C7/04B01J20/20B01J20/28C01B32/318D01F9/16D04H1/4242F02M25/08B01J20/28073B01J20/28083B01J20/28076B01J20/28066B01J20/28011B01J20/2808B01J20/28033B01J20/28071C01B32/30C01P2006/12C01P2006/14C01P2006/16C01B32/336D01F9/17B01D53/02B01D2253/108B01D2258/01B01D2257/702B01J20/28038B01D53/04B01D53/0415B01D2253/102B01D2253/306B01D2253/308B01D2253/311B01D2259/4516B01J2220/42B01J2220/66D10B2401/10D10B2505/12F02M2200/9046
Inventor 今井大介渡边佳英高田由生小泽骏介芳田千惠
Owner NIPPON PAPER IND CO LTD
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