Ube Industries, Inc.

Yutaka Kanetsuki

Nozomu Tanihara

Tomohide Nakamura

Nobuhiko Fukuda

Kenji Fukunaga

Toshimune Yoshinaga

Minoru Shigemura

Manabu Hayashi

Hiroshi Uchida

A process for producing nitrogen-rich air by feeding high temperature air at 150&#xb0; C. or more to an air separation membrane module is described. After being placed at 175&#xb0; C. for two hours, the air separation module exhibits a shape-retention ratio of 95% or more in one embodiment. The nitrogen-rich air can be fed to a fuel tank for an aircraft, for example.

Gas separation membrane module and method for gas separation

Gas separation membrane module and gas separation method

A gas separation membrane module, comprising: a hollow fiber element having a hollow fiber bundle consisting of a number of hollow fiber membranes and a tube sheet provided at an end of the hollow fiber bundle for binding the hollow fiber membranes; a vessel having an opening through which the hollow fiber element is inserted or removed; a lid member having a gas outlet formed therein and attached to cover the opening of the vessel; and a perforated plate having a plurality of through holes for forming gas channels formed therein, the perforated plate being mounted between the tube sheet and the lid member, the gas separation membrane module performing gas separation by supplying mixed gas to the hollow fiber membranes.

Gas separation membrane module and method of replacing a hollow fiber element

An asymmetric hollow-fiber gas separation membrane is made of a soluble aromatic polyimide that is composed of a specific repeating unit. The tetracarboxylic acid component of the unit has a diphenylhexafluoropropane structure and a biphenyl structure. The diamine component of the unit essentially contains diaminobenzoic acids and any of diaminodibenzothiophenes, diaminodibenzothiophene=5,5-dioxides, diaminothioxanthene-10,10-diones, and diaminothioxanthene-9,10,10-triones.

Asymmetric hollow fiber gas separation membrane and gas separation method

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Ube, Japan

Yutaka Kanetsuki