Solvent extraction is a method for separating a substance from one or more others by using a solvent. It relies on variations in the solubilities of different compounds in different substances. In most cases, the substance to be extracted, which may be a solid, a liquid or a gas, is dissolved in a liquid, along with other substances, and a liquid solvent is used for the extraction — this is sometimes called liquid-liquid extraction. The technique may also be applied to solid materials that contain compounds that need to be extracted. This method is widely used in industry, and in the laboratory for refining, isolating and purifying a variety of useful compounds.
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| Solvent extraction machine |
Methods of solvent extraction:
A solvent will be chosen that does not mix with the compound in which the substance of interest is currently dissolved, so that, when left undisturbed, they will form two separate layers, as with oil and water. It is also important that the compound to be extracted should have greater solubility in the solvent that has been added, and that this should not dissolve any unwanted substances in the original mixture. Once added, the two liquids may be shaken together for a time then allowed to stand for a while, so that they separate out. The choice of solvent to be used will depend on the chemical and physical properties of all the substances in the mixture. The process may need to be carried out in several stages, using different solvents.
This method is also employed in the production of essential oils, which are used in perfumes, aromatherapy, and as flavorings, from plant material. The technique is often preferred where distillation is not suitable. Where soil has been contaminated by pollutants, solvent extraction may be used to remove some of them as part of an environmental remediation project. This can be an effective method where the contaminants are themselves solvents. In the laboratory, the technique is much used in the analysis of samples to determine what substances are present, and in what amounts.
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What is solvent extraction？
Solvent extraction is a method for separating a substance from one or more others by using a solvent. It relies on variations in the solubilities of different compounds in different substances. In most cases, the substance to be extracted, which may be a solid, a liquid or a gas, is dissolved in a liquid, along with other substances, and a liquid solvent is used for the extraction — this is sometimes called liquid-liquid extraction. The technique may also be applied to solid materials that contain compounds that need to be extracted. This method is widely used in industry, and in the laboratory for refining, isolating and purifying a variety of useful compounds. - See more at: http://www.doingoilmachine.com/PRODUCTS/Oil_Extraction_Process/solvent_extraction_process_433.html#sthash.vLvQ9KcJ.dpuf
Solvent extraction is a method for separating a substance from one or more others by using a solvent. It relies on variations in the solubilities of different compounds in different substances. In most cases, the substance to be extracted, which may be a solid, a liquid or a gas, is dissolved in a liquid, along with other substances, and a liquid solvent is used for the extraction — this is sometimes called liquid-liquid extraction. The technique may also be applied to solid materials that contain compounds that need to be extracted. This method is widely used in industry, and in the laboratory for refining, isolating and purifying a variety of useful compounds. - See more at: http://www.doingoilmachine.com/PRODUCTS/Oil_Extraction_Process/solvent_extraction_process_433.html#sthash.vLvQ9KcJ.dpuf
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