Nippon Sanso Corporation

Taiyo Nippon Sanso Corporation

Masayoshi Hayashida

Akihiro Nakamura

Katsuyoshi Yanagita

Masato Kawai

Takashi Inui

Takushi Ohsaki

Akira Wakaizumi

Shinichi Marumo

Yoshinori Watanabe

Nobuyasu Tomita

Satoshi Sawaguchi

Hiroyuki Miyake

Fusao Nakamura

An adsorbent for separating nitrogen from a mixed gas of oxygen and nitrogen is MSC wherein an oxygen and nitrogen separation ratio &#x3b1; and a ratio (t/t) of a time trequired for adsorbing 50% of the oxygen equilibrium adsorption amount and a time trequired for adsorbing 95% of the oxygen equilibrium adsorption amount satisfy the inequality()&#x3c;&#xd7;(&#x3b1;&#x2212;)&#x3b1;&#x2267;The amount of adsorbent used with respect to a predetermined amount of nitrogen generated can be reduced since a method is carried out which uses this adsorbent to produce nitrogen by separating nitrogen from the mixed gas of oxygen and nitrogen by means of a PSA method. By this method, it is possible to reduce the cost of the apparatus and reduce and miniaturize the scale of the apparatus, and the power consumption amount can be reduced.

Adsorbent for separating nitrogen from mixed gas of oxygen and nitrogen

CMS adsorbents having suitable indexes are used to improve greatly the performance of nitrogen-producing apparatuses where nitrogen is obtained from the air with a PSA method, so as to improve the efficiency of nitrogen production. A nitrogen PSA apparatus is formed with two adsorbing columns where an adsorption step and a regeneration step are performed alternatively and periodically. The adsorption step is for adsorbing oxygen and conducting nitrogen to a product tank with the supply of compressed air from an air compressor, and the regeneration step for releasing the adsorbed gas after the adsorption step. The adsorbing columns are filled with a carbon molecular sieve (CMS) that selectively adsorbs oxygen as an adsorbent. The CMS adsorbs an oxygen/nitrogen amount of 50% of the saturated adsorption amount with a period TO/TN starting from oxygen/nitrogen supply, wherein TO is 5&tilde;10 seconds and TN is larger than TO by more than 41 times.

Method and apparatus for producing nitrogen

A halogen treatment is conducted comprising: a halogenation step wherein a halogenation heat treatment for preparing a halogenated carbonized charcoal is conducted in which the carbonized charcoal is brought into contact with halogen; and a dehalogenation step wherein a dehalogenation treatment is conducted in which a part of or all halogen atoms in the halogenated carbonized charcoal are eliminated. A porous carbonaceous material is obtained at a high yield, and the amounts of nitrogen, oxygen, carbon dioxide, and methane adsorbed by this porous carbonaceous material are large. When this porous carbonaceous material is used as an electrical double layer capacitor carbon, the electrostatic capacity is increased compared to conventional carbonaceous materials. Consequently, a carbonaceous material is obtained which has micopores and/or sub-micropores which are suitable for the adsorption of small molecules such as nitrogen, and for storage of electrochemical energy.

Porous carbonaceous material, manufacturing method therefor and use thereof

Carbon adsorbent, manufacturing method therefor, gas separation method

Process for producing molecular sieve carbon

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Kitakoma-gun, Japan

Masayoshi Hayashida