| 摘要 |
A method is disclosed for solvent-extracting an extractable component from a mixture including the extractable component and subdivided solids, comprising: (a) maintaining a vertically extending bed comprising said solids in a vertically extending extraction zone and introducing said mixture into an upper portion of said bed; (b) providing a substantially continuous gaseous phase in contact with a lower portion of said bed; (c) maintaining a substantially continuous liquid phase comprising a vaporizable liquid solvent in contact with at least a lower part of an upper portion of said bed; (d) introducing said solvent into said liquid phase at at least two vertically spaced levels of said liquid phase; (e) extracting said extractable component from said mixture with said solvent; (f) withdrawing said solvent and said extractable component from said liquid phase between said two vertically spaced levels; (g) preventing said liquid phase from flowing downwardly through said lower portion of said bed by maintaining said gaseous phase at a pressure sufficient to support said liquid phase thereon and vaporizing solvent adhering to solids in said lower portion of said bed; and (h) withdrawing solids from said lower portion of said bed.
|
