Question

What is Solid – Liquid extraction?

Answer 1

Hint: Extraction is a process of separation in which the chemicals are separated out from the given mixture. Solid-liquid extraction is a type of extraction that is performed between the solid and liquid phases.

Complete answer:
Solid-liquid extraction allows soluble components to be removed from solids using a solvent. Here, the solute phase is solid which is dispersed in the solvent or we can say that the solute is transferred from a solid phase to a liquid phase.
It is mainly used to remove soluble components from solid using a solvent.
Factors that influence solid-liquid extraction are; particle size, solvent, temperature and agitation of fluid. The properties of the solid may change considerably during the process.
Solid – liquid extraction is usually batch, semi – batch or continuous. It usually operates at elevated temperature to increase the solubility of the solute in the solvent.
An everyday example of solid-liquid extraction is the preparation of coffee. Here, water is used to remove the coffee flavors from the coffee powder. Hence, this results in drinkable coffee.
Boiling tea leaves in water extracts the tannins, caffeine, and theobromine out of the leaves into the water. Hence, this is an example of solid liquid extraction.
Applications are:
-In the metal industry for removing minerals from ores (acid solvents).
-In the sugar industry it is used for removing sugar from beets (water is solvent).
-In the oilseeds industry it is used for removing oil from soybeans.

Note:
The basic principle of solid – liquid extraction is the partitioning of compounds between two phases of solid and liquid.The most common types of extraction are: liquid - liquid extraction , liquid - solid extraction , acid-base extraction.