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What is extraction? What is the role of solvent in extraction?

2021-01-15

Customers often call to consult with solvent for extraction. So what is extraction? What is the role of our solvent oil in the application of extraction? What are the steps in the process of extraction? What are two phases? With questions, learn together.

Extraction, as the name implies, means the extraction of essence. In practice and scientific research, extraction is generally divided into solid-liquid extraction and liquid liquid extraction. Solid-liquid extraction is more common in our daily life, such as brewing tea, brewing tea leaves through boiling water, and organic ingredients in tea leaves are entered into the water. This is a simple solid-liquid extraction process, while liquid liquid extraction is a solution. The process of transferring from one solvent to another is still taken as an example of tea water. After soaking the organic components in tea, it is dissolved in water. At this time, this cup of tea made of organic components and water is called "extraction solution". However, at this time, the solvent which is not soluble with water comes in. The organic component that was originally in water is found to be in line with the new solvent gas The field is more suitable, and then the organic components come out of water and run into the solvent, which is actually a simple extraction process.

This solvent is called "extractant", and tea water which has lost organic components is called residual liquid. The solvent for obtaining organic component is called "loaded organic phase". To achieve liquid-liquid extraction, an important condition must be met. The two liquids, the liquid to be extracted and the extractant, must be able to become two phases.

So what is the liquid to be extracted? What are the two phases? In short, the liquid to be extracted is the original liquid containing the extract, for example, we mentioned tea water just now. Two phases are two substances that are not soluble or partially soluble. They form an interface between two substances, and can be separated by mechanical methods. For example, add an ice to a cup of water, and ice water coexist. Although the chemical properties of ice and water are the same, their physical states are different, one is solid and the other is liquid. We can use mechanical methods to make them They are separated, which is called two phases. For example, tea water and solvent are liquids, but the density of the two is different and they are not soluble. At this time, a clear liquid layer is formed, which is also called two-phase. However, adding alcohol into water will not form two phases. Although the physical and chemical properties of water and alcohol are different, they can be dissolved and interface will not be formed. Therefore, the aqueous solution of alcohol is called one phase.

We understand the extraction mechanism and the terms in extraction. Next, we will know "reverse extraction". Liquid-liquid extraction technology is usually used in the form of combination of extraction and reverse extraction in industry. So why do we need to reverse extraction? What is the reverse extraction? First, why do we use reverse extraction in industry? First, the organic components in the loaded organic phase are recycled or other products are made by the later process; secondly, the extractant can be regenerated to realize recycling.

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In industrial production, in order to save cost, the extractant is generally recycled. There are two common methods for regeneration of extractant, one is distillation well known to the public, the other is to add a new solvent in the loaded organic phase. After mixing, the organic components in the loaded organic phase are transferred to the new solvent. At this time, the organic components of the organic component are removed Phase is a regeneration extractant, and this method is called back extraction. Liquid-liquid extraction technology has been widely used in the actual industrial production because of its advantages such as simple operation, energy saving and consumption reduction, such as pharmaceutical intermediate extraction, hydrometallurgy industry gold extraction, environmental protection industry wastewater treatment, etc. What are the solvents for extraction? Welcome to contact.