| 摘要 |
A packing for a liquid-vapour contact column is provided which comprises metallic sheets defining liquid-vapour passages and having at least one wettable surface comprised of a coating of porous metal. The sheets are perforated to permit vapour to pass between them. The porous metal coating is formed by spraying a particulate mixture of metal and a plastics material onto the sheet to form a coating of plastics particles embedded in metal and then heating to volatilize the plastic thereby forming porosity in the metal coating. |
