Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Other

Dowa Mining Co., Ltd.

Showa Denka K.k.

Dowa Iron Powder Co., Ltd.

Hitoshi Atobe

Toraichi Kaneko

Masakazu Oka

Yoshio Furuse

Shigehiro Chaen

Masatoshi Hotta

Kazumasa Tezuka

Chiaki Izumikawa

Yuji Hayasaka

Kazuto Ito

Shinichi Yano

Junichi Torisu

Yasuyuki Hoshino

To provide a process and an apparatus for treating a waste anesthetic gas containing a volatile anesthetic and nitrous oxide, discharged from an operating room. In the present invention, a waste anesthetic gas containing a volatile anesthetic and nitrous oxide is introduced into an adsorbing cylinder filled with an adsorbent, where the volatile anesthetic contained in the waste anesthetic gas is adsorbed and thereby removed, and successively this gas is introduced into a catalyst layer filled with a nitrous oxide decomposition catalyst, where nitrous oxide is decomposed into nitrogen and oxygen.

Process and apparatus for treating waste anesthetic gas

To provide a process and an apparatus for treating a waste anesthetic gas containing a volatile anesthetic and nitrous oxide discharged from an operating room by introducing the gas into an adsorbing cylinder filled with an adsorbent, where the volatile anesthetic contained in the waste anesthetic gas is adsorbed and thereby removed, and successively introducing the gas into a catalyst layer filled with a nitrous oxide decomposition catalyst, where nitrous oxide is decomposed into nitrogen and oxygen. By using the process and the apparatus for treating a waste anesthetic gas of the present invention, a volatile anesthetic having a possibility of destroying the ozone layer or nitrous oxide as a global warming gas can be made harmless while preventing the release into atmosphere.

Process for treating waste anesthetic gas

Tetrafluorosilane is produced by a process comprising a step (1) of heating a hexafluorosilicate, a step (2-1) of reacting a tetrafluorosilane gas containing hexafluorodisiloxane produced in the step (1) with a fluorine gas, a step (2-2) of reacting a tetrafluorosilane gas containing hexafluorodisiloxane produced in the step (1) with a high valent metal fluoride, or a step (2-1) of reacting a tetrafluorosilane gas containing hexafluorodisiloxane produced in the step (1) with a fluorine gas and a step (2-3) of reacting a tetrafluorosilane gas produced in the step (2-1) with a high valent metal fluoride. Further, impurities in high-purity tetrafluorosilane are analyzed.

Production of tetrafluorosilane

A step (1) of heating a fluoronickel compound to release a fluorine gas, a step (2) of allowing a fluorine gas to be occluded into a fluorinated compound, and a step (3) of heating the fluoronickel compound and reducing an inner pressure are conducted in a container, respectively, at least once, and thereafter a high-purity fluorine gas is obtained in the step (1). Also, a step (5) of heating a fluoronickel compound and reducing an inner pressure and a step (6) of allowing a fluorine gas reduced in a hydrogen fluoride content to be occluded into the fluoronickel compound are conducted in a container having a fluorinated layer formed on its surface, respectively, at least once, the step (5) is further conducted, and thereafter a fluorine gas containing impurity gases is contacted with the fluoronickel compound to fix and remove the fluorine gas, and the impurities are analyzed by gas chromatography.

High-purity fluorine gas, production and use thereof, and method for analyzing trace impurities in high-purity fluorine gas

The invention relates to a catalyst for decomposing nitrous oxide, which is [1] a catalyst comprising a support having supported thereon aluminum, magnesium and rhodium, [2] a catalyst comprising an alumina support having supported thereon magnesium and rhodium, [3] a catalyst comprising a support having supported thereon rhodium, the support comprising a spinel crystalline composite oxide formed by magnesium and at least a part of aluminum, [4] a catalyst comprising a support having supported thereon aluminum, rhodium and at least one metal selected from zinc, iron, manganese and nickel, [5] a catalyst comprising an alumina support having supported thereon rhodium and at least one metal selected from zinc, iron, manganese and nickel, or [6] a catalyst comprising a support having supported thereon rhodium, the support comprising a spinel crystalline composite oxide formed by at least a part of aluminum and the at least one metal selected from zinc, iron, manganese and nickel. The catalyst is not easily deteriorated in the activity due to moisture, favored with low-temperature decomposition activity and capable of reducing the amount of NOx generated to the allowable concentration or less. The invention also relates to a process for producing the catalyst and to a method for decomposing nitrous oxide.

Catalyst for decomposing nitrous oxide, process for producing the same and method for decomposing nitrous oxide

Harm-removing agent and method for rendering halogen-containing gas harmless and uses thereof

A reactive agent for decomposing fluorine compounds comprising alumina and an alkaline earth metal compound; a process for decomposing fluorine compounds, comprising contacting the reactive agent with a fluorine compound at a temperature of 200&deg; C. or more; and a process for manufacturing a semiconductor device, comprising an etching or cleaning and a decomposing using the reactive agent.

Reactive agent and process for decomposing fluorine compounds and use thereof

A method for decomposing nitrogen fluoride or sulfur fluoride, comprising contacting gaseous nitrogen fluoride or sulfur fluoride with a solid reagent comprising elemental carbon, one or more of the alkaline earth metal elements and optionally one or more of the alkali metal elements, to fix the fluorine component in the nitrogen fluoride or sulfur fluoride in said reagent.

Method for decomposing nitrogen fluoride or sulfur fluoride and decomposing reagent used therefor

Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.

Process for decomposing fluorocarbons reagent and apparatus used therefor

A process for decomposing nitrogen fluoride, comprising contacting gaseous nitrogen fluoride with a solid reactive agent for decomposition at 200.degree. C. or more to fix the fluorine component in the nitrogen fluoride to the reactive agent and at the same time control generation of nitrogen oxides, fluorocarbon and carbon monoxide as by-products, the reactive agent containing elemental carbon; aluminum compound, iron compound, manganese compound and/or alkaline earth metal; alkali metal compound; and nickel compound, tin compound and/or copper compound.

Growing community of inventors

Kanagawa, Japan

Hitoshi Atobe