11 Extraction .................................................................................................. 259
11.1
Introduction ................................................................................... 259
11.2 Solid–liquid extraction (leaching) .................................................... 261
11.2.1 Defi nitions ......................................................................... 261
11.2.2 Material balance ................................................................ 262
11.2.3 Equilibrium ........................................................................ 262
11.2.4 Multistage extraction .......................................................... 262
11.2.5 Stage effi ciency .................................................................. 266
11.2.6 Solid–liquid extraction systems ........................................... 268
11.3 Supercritical fl uid extraction ............................................................ 271
11.3.1 Basic principles .................................................................. 271
11.3.2 Supercritical fl uids as solvents ............................................. 272
11.3.3 Supercritical extraction systems ........................................... 273
11.3.4 Applications ....................................................................... 275
11.4 Liquid–liquid extraction .................................................................. 276
11.4.1 Principles ........................................................................... 276
11.4.2 Applications ....................................................................... 276
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