In a compound extraction process, solvent extraction allows separating compounds based on their relative solubility. The process requires using a solvent, usually a fluid with the ability to dissolve other compounds or substances.
Solvent extraction is a widely used process that is required for smooth operations in multiple industries, including the processing of perfumes and vegetable oil. Petrochemical refining industries also use a form of solvent extraction process.
The process is also highly effective in separatingpotentially hazardous contaminants from sludge and sediments. It is quite beneficial for hazardous waste generators by reducing the amount of hazardous waste that must be treated separately. Therefore, many industries rely upon the method and require the appropriate extraction solvent for the process.
An important note about solvent extraction is that it doesn’t destroy a compound, but separates it. Thus, it comes as a process that can provide many benefits depending on the industry where it is used.
Extraction solvent
Solvent is a compound that can dissolve other molecules, called solutes. Solvent can be solid, liquid or gas. In scientific terms, a solvent can pull apart the solute’s molecules, creating a homogenous mixture of solvent and solute. This mixture cannot be separated physically, but heat and other chemical processes can be applied to separate solute from the solvent. Most popular solvents are water and organic compounds such as tetrachloroethylene, turpentine, etc. Hydrocarbons like butane and ethane are also used as solvents for extraction.
Solvent based extraction process
As the name suggests, it is the process of separating something from a mixture. It must be done through force and the process takes place over the course of two different immisciblephases.
Immiscible liquids are those that do not dissolve in one another due to differences in polarity and orientation and form a layer when mixed. The order of liquids in layers isdeterminedby its density. Liquid with a higher density will remain at the bottom.
The method of extraction varies depending on the equipment used. In the simplest form, it uses some kind of separatory funnel. Industries use an extractor based on their extraction requirements. The mixture that is to be separated is first added to the funnel followed by two extraction solvents. The funnel is shaken forcibly and allowed to stand for several minutes. One of the two layers formed has the target molecule for extraction.
Further processing is required to separate the required molecules from the extraction solvent.