METHOD FOR RECOVERING GAS FROM WHICH FLOATING PARTICULATES IN AMBIENT AIR HAVE BEEN REMOVED USING PORE DIFFUSION MEMBRANE SEPARATION MODULE LOADED WITH COMPOSITE MEMBRANE

To provide a membrane separation technique for recovering clean air while removing particulates of 0.02 μm or larger dispersed in the air at a removal rate (logarithmic removal coefficient display) of two or more, without causing clogging in pores in the membrane.MEANS FOR SOLVING THE PROBLEM: Ambient air is separated into two kinds of orthogonal flows consisting of a viscous flow that is parallel to a membrane surface of a composite membrane, and a diffusion flow resulting from a transmembrane pressure difference, by using a pore diffusion membrane separation module loaded with a composite membrane holding a specified microstructure to recover only the component of the diffusion flow.SELECTED DRAWING: Figure 1 【課題】 空気中に分散する０．０２μｍ以上の微粒子を膜中の孔を目詰まりさせることなく除去率（対数除去係数表示）で２以上除去しつつ清浄な空気を回収する膜分離技術を提供する。【解決方法】 特定した微細構造を持つ複合膜を装填した孔拡散膜分離モジュールを用い、外気を複合膜の膜面に平行な粘性流れと、膜間差圧に原因した拡散流れとの直交する２種の流れに分離させ、拡散流れの成分のみを回収する。【選択図】図１