| 摘要 |
PURPOSE:To obtain an adsorbent well adsorbing both of a basic and acidic malodorous compounds by rapidly freezing hydrated swollen montmorillonite mineral and subsequently freeze-drying the frozen one under pressure. CONSTITUTION:When a tank is filled with water and powdery montmorillonite mineral is gradually charged in the tank little by little under stirring, the montmorillonite mineral is uniformly dispersed to become a uniformly hydrated and swollen liquid state. When this hydrated and swollen composition is brought into contact with a low temp. medium such as an ethanol/dry ice mixture, the composition is instantaneously frozen to float and a frozen substance is obtained. Further, this frozen substance is charged in a vacuum freeze-drying apparatus while the frozen state thereof is kept in an atmosphere of 0 deg.C or less to be freeze-dried under vacuum. The adsorbent thus obtained develops good deodorizing properties to both acidic and basic malodorous compounds. |
