JPS6178416A - Method for removing adsorbed gas of activated carbon - Google Patents

Abstract

PURPOSE:To make it possible to effectively perform the degassing of activated carbon, in a method for removing adsorbed gas of activated carbon, by dividing activated carbon immersed in a water-soluble electrolyte into two groups through an ion filterable partition and applying DC voltage thereto. CONSTITUTION:Pasty mixtures 1a, 1b each prepared by mixing activated carbon and an electrolyte are opposed to each other through a porous separator compris ing alumina unglazed pottery and surrounded by side walls 3a, 3b comprising conductive rubber, a bottom plate 4a and an upper lid 4d. Pressure is applied from the outside by press heads 5a, 5b to hold the pasty mixtures so as to compress the total volume thereof to about 80% and the whole is placed in a thermostatic tank at 70 deg.C while DC voltage of 1.1V is applied between the side walls for 1hr, and CO2 and N2 are discharged from the through-holes 4c of the upper lid 4 to perform the degassing of activated carbon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for removing gas adsorbed on activated carbon using the principle of electrochemical electrode phenomena.

The purpose of adsorbed gas removal is to improve the coating rate of the activated carbon surface with liquid in applications where the activated carbon surface is covered with liquid.It is also an application field that it can be used to improve the performance of electric double layer capacitors using activated carbon as electrodes. This is one example.

[Explanation of prior art and pointing out drawbacks]

In general, activated carbon has a large specific area and an active surface, so during the manufacturing process and storage of activated carbon, large amounts of (1!X, ffl, carbon dioxide, water vapor, etc.) are For this reason, as a means to effectively cover the surface area of activated carbon with liquid, the conventional method is to use 1, for example, 600°C high temperature,
After performing vacuum treatment at 10''-'' to 10-' Torr, an extremely difficult degassing process was required, such as immersing it directly in the desired liquid without contacting it with any other gas or liquid.

[Object of the present invention]

An object of the present invention is to provide a method for removing adsorbed gases from activated carbon, which eliminates such conventional drawbacks.

[Explanation of composition and action]

Embodiments of the present invention will be described below with reference to FIG.

FIG. 1 shows a sectional view of an activated carbon adsorbed gas removal device according to the present invention.

In Figure 1, 1a and 1b are activated carbon and electrolyte (
A paste-like mixture of dilute sulfuric acid with a concentration of 30% by weight) is mixed at a ratio of approximately 1:2<X amount), and this mixture 1a, 1
The mixtures 1a and 1b face each other with a porous separator 2 made of unglazed alumina (thickness: 3") interposed therebetween, and the mixtures 1a and 1b are approximately equal in proportion.

Moreover, the mixture 1a+1b is a pair of 41! It is surrounded from above and below by an insulating frame 4 made of a paper board 4a and a top plate 4b, which are in contact with side walls 3a and 3b made of rubber.

The upper lid 4b is provided with a through hole 4C for releasing gas.

Further, pressure heads 5a are provided on the outside of the side walls 3a and 3b, respectively.
, 5bt- is prepared, and pressure is applied from the outside of the pressure head 5a+5b to prepare the mixture 1a, lb'.
It is kept compressed to about 80% volume.

Next, place the entire processing device in a constant temperature bath at 70°C.
A direct current voltage of 1.1 square meters is applied between the side walls 3b and 3b for 1 hour to hold the mixtures 1a and 1b from the left and right sides. 2+!
Carbon dioxide gas and! from hole 4C! Releases elementary gas.

Next, electric double layer capacitors were manufactured using activated carbon treated according to the present invention and untreated activated carbon, and their performances were compared and measured.

Regarding the manufacturing method of electric double layer capacitors.

US Patent No. 3,536,963 to Akira et al.

The results of comparative measurements between the embodiment of the present invention and the conventional example are shown in the following table.

That is, due to the degassing treatment, the effective surface of the activated carbon in contact with the electrolyte increases, so the capacitance increases by about 30%.

Note that when the voltage applied during degassing is less than the DC voltage O, SV, the electrochemical electrode phenomenon does not occur and there is no degassing effect, and when the voltage exceeds 1.7V, the water
．． It was confirmed that gas was generated due to gas decomposition and that there was no degassing effect.

[Explanation of effects]

The present invention has the following effects.

(1) Activated carbon can be degassed using a simple method that can be mass-produced.

If (II) is applied to the activated carbon of a double-layer single-layer capacitor, the capacitance it'' can be increased.Also, when designing a capacitor with the same capacitance fi value, it can be made smaller and the cost can be reduced. Become.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an activated carbon adsorbed gas removal device according to the present invention. 1 ar 1 b...Activated carbon and 'I! Mixture with L solute, 2...Porous separator, 3a, 3
b... Side wall of flexible rubber, 4... (
insulator) frame body, 4a...bottom plate, 4b...
...Top lid, 4c...Top lid through hole, 5"+5b
・・・・・・Pressure head.

Claims (1)

[Claims] Activated carbon soaked in water-soluble electrolyte is divided into two groups via an ion-permeable partition, and a DC voltage of 0.5 to 1.7 V is applied between both activated carbons to remove the gas adsorbed on the activated carbon surface. A method for removing adsorbed gases from activated carbon, which is characterized by increasing the area covered by an electrolyte on the activated carbon surface.