Gas and Vapor Separation through Polyimide Membranes

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  • TANIHARA Nozomu
    Specialty Products Development Center, Chemicals Company, Ube Industries, Ltd.
  • NAKANISHI Shunsuke
    Specialty Products Development Center, Chemicals Company, Ube Industries, Ltd.
  • YOSHINAGA Toshimune
    Organic Specialty Materials Research Laboratory, Corporate Research and Development, Ube Industries, Ltd.

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  • ポリイミド膜によるガスおよび蒸気分離

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<p>Organic, inorganic, and metal-based materials for membrane technologies have been studied and developed, and membranes made from some of these materials have been applied to industrial applications. Various polyimides synthesized from combinations of several types of acid dianhydrides and diamines allow systematic molecular design of the membrane materials. Polyimide membranes applied to hydrogen recovery in the petroleum industry in the 1980 s are still used in various applications for gas and vapor separation such as nitrogen- or oxygen-enrichment by air separation, dehumidification, dehydration, carbon dioxide removal, and others. In particular, polyimides from 3,3’,4,4’-biphenyltetracarboxylic dianhydride (BPDA) have excellent fiber-forming properties with good thermal, chemical, and mechanical durability, so are used to manufacture asymmetric hollow fiber membranes for use in many membrane separation processes. This review introduces the material characteristics of polyimides, membrane properties of polyimide hollow fiber membranes, and applications as membranes for gas and vapor separation.</p>

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