JPH11128737A5

JPH11128737A5 -

Info

Publication number: JPH11128737A5
Application number: JP1997297440A
Authority: JP
Filing date: 1997-10-29
Publication date: 2005-05-26
Anticipated expiration: 2017-10-29

Description

しかし、これらの従来法では多くの硫黄化合物は除去できるが、特定悪臭物質である硫化ジメチル、二硫化ジメチルのような硫化アルキル類は十分満足できるまで除去することができなかった。
これに対して、活性炭吸着法において、一般の活性炭とは別に予め臭素を添着させた臭素添着活性炭を用いた場合には、前者による物理吸着とは異なる機構、つまり硫化ジメチル、二硫化ジメチルを化学吸着することにより除去できることが、例えば、特開昭５４−１３２４７０号公報、特公昭５５−２０７３２号公報及び特開昭５５−５１４２２号公報などにより提案されている。 However, although these conventional methods can remove many sulfur compounds, they have not been able to remove alkyl sulfides such as dimethyl sulfide and dimethyl disulfide, which are specific malodorous substances, to a satisfactory extent.
In contrast to this, in the activated carbon adsorption method, when bromine-impregnated activated carbon, which is pre-impregnated with bromine and separate from ordinary activated carbon, is used, dimethyl sulfide and dimethyl disulfide can be removed by a mechanism different from the physical adsorption by the former, that is, by chemical adsorption, as has been proposed, for example, in Japanese Patent Laid-Open Nos. 132470/1979, 20732/1980 and 51422/1980.

Claims

A bromine-impregnated activated carbon characterized in that the surface oxide content is 2.5 wt % or less as oxygen and bromine is impregnated at 3 wt % or more.

2. The method for producing bromine-impregnated activated carbon according to claim 1, wherein the raw activated carbon is heat-treated at 500 to 1100°C in the absence of oxygen to form a carrier activated carbon, and then bromine is impregnated into the carrier activated carbon.

3. The method according to claim 2, wherein the surface oxide content of the activated carbon carrier before impregnation with bromine is 2.0 wt % or less in terms of oxygen.

A method for adsorbing and removing alkyl sulfides using bromine-impregnated activated carbon having a surface oxide content of 2.5 wt % or less as oxygen and impregnated with bromine at 3 wt % or more.

An adsorbent/removal agent for alkyl sulfides, comprising bromine-impregnated activated carbon having a surface oxide content of 2.5 wt % or less as oxygen and having bromine impregnated therein at 3 wt % or more.