Nippon Soken, Inc.

Naohisa Ohyama

Atushi Kosaka

Makoto Takemura

Minoru Hatano

Molecular sieve carbon fibers capable of separating and purifying nitrogen from air in large quantities are provided. The carbon fibers have diameters of 5 to 50 .mu.m and micropores opening directly at the surface of the carbon fibers with pore sizes of 0.5 nm or less. They are capable of separating nitrogen at a purity of 98% or higher, even 99.9% or higher from air, etc., with a relatively low adsorbing pressure and deadsorbing vacuum. The molecular sieve carbon fibers do not deteriorate during operation since they are resistant to division or powdering and the adsorbing pressure and deadsorbing vacuum are relatively low.

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Nishio, Japan

Naohisa Ohyama