Liquidliquid Extraction

Liquid-liquid extraction operations are like solids leaching except the food, solvent, and solute are all in the liquid state. Most commercial processes are normally operated on a continuous basis. Table 2 shows the solvent, solute, and product produced from extracting some liquid raw materials. As shown in Figure 3, the ordinary extraction process involves countercurrent flow to maintain the maximum driving force. However, the relationship between the liquids sometimes makes a cocurrent operation more advisable.

Extracted solid

Figure 2. Batch-continuous three-phase solid-liquid extraction.

Extracted solid

Figure 2. Batch-continuous three-phase solid-liquid extraction.

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