What is extraction and what does extraction mean

Extraction, also known as solvent extraction or liquid-liquid extraction (to distinguish it from solid-liquid extraction, i.e., leaching), also known as extraction (commonly used in the petroleum refining industry), is a kind of mass transfer separation process that uses liquid extractants to treat immiscible two-component or multi-component solutions with them to achieve component separation, and is a widely used unit operation. Using the principle of similar dissolution, there are two ways of extraction: liquid-liquid extraction, which separates a component of a liquid mixture with a selected solvent, which must be immiscible with the liquid of the mixture being extracted, have selective solubility, and must have good thermal and chemical stability, and have little toxicity and corrosiveness.

For example, benzene is used to separate phenols in coal tar; separation of olefins from petroleum fractions with organic solvents; Br2 in water was extracted with CCL4Solid-liquid extraction, also known as leaching, uses solvents to separate components in a solid mixture, such as sugars in sugar beets with water; Soybean oil in soybeans is soaked with alcohol to increase oil yield; Extracting the active ingredient from Chinese medicine with water to make a flow extract is called "leaching" or "leaching". Although extraction is often used in chemical experiments, its operation does not cause a change in the chemical composition (or chemical reaction) of the extracted substance, so the extraction operation is a physical process.

Extraction is one of the methods used in organic chemistry laboratories to purify and purify compounds. By extraction, the desired compound can be extracted from a mixture of solids or liquids.

The soluble solute in another solid or liquid phase is dissolved by solvent to facilitate separation or purification.

Extraction, also known as solvent extraction or liquid-liquid extraction, also known as extraction, is a unit operation that uses the different solubility of components in a system to separate a mixture in a solvent. That is, it is a method of transferring solute substances from one solvent to another solvent by using the difference in solubility or partition coefficient of substances in two immiscible (or slightly soluble) solvents.

It is widely used in chemical, metallurgical, food and other industries, and is commonly used in petroleum refining industry. In addition, the operation of separating the two immiscible liquids after extraction is called dispensing.

Extraction principle: The difference in solubility or partition coefficient of a substance in two immiscible (or slightly soluble) solvents is used to transfer a substance from one solvent to another. After repeated extractions, most of the compounds were extracted.

The solvent extraction process generally consists of extraction, washing, and reverse extraction. Generally, the process of extracting solutes in the aqueous phase from the organic phase is called extraction, the process of removing other solutes or inclusions from the loaded organic phase in the aqueous phase is called washing, and the process of resolving solutes in the organic phase in the aqueous phase is called reverse extraction.

Dictionary Explains:

Solvent treatment to remove soluble substances.

Thoroughly remove unwanted components with a solvent.

Key words: 1. Remove:

Dismantle. Remove.

Abrogate. Indicates that what is said is not counted.

2. Remove: get rid of; Get rid of yourself. For example, you have your choices, and it's time for you to get rid of your whimsical ideas.

Abandon; **。Such as: remove the shortcomings.

3. Ingredients: also known as "ingredients".

Score. Refers to the various different substances or factors that make up things.

A class attribute delineated according to the nature of an individual's main life for a certain period of time.

4. Thoroughness: Transparent to the end. The description is deep and complete, and nothing is left.

Describe the water as clear to the bottom.

Extraction refers to the transfer of compounds from one solvent to another by taking advantage of differences in solubility or partition coefficients between two immiscible (or slightly soluble) solvents. This is a method in which most of the compounds are extracted after repeated extractions.

Extraction, also known as solvent extraction or liquid-liquid extraction (to distinguish it from solid-liquid extraction, that is, leaching), also known as extraction (commonly used in the petroleum refining industry), is a mass transfer separation process that uses a liquid extractant to treat a two-component or multi-component solution that is immiscible with it to achieve component separation, and is a widely used unit operation. ‍

In chemistry, the method of separating two substances with different solubility by solvent is called extraction.

Meaning of extraction:

Extraction is a unit operation that uses the different solubility of components in the system in the solvent to separate the mixture, using the principle of similar miscibility, there are two ways of extraction:

Liquid-liquid extraction, the separation of a component of a liquid mixture with a selected solvent that is incompatible with the liquid of the extracted mixture, has selective solubility, and must have good thermal and chemical stability, as well as little toxicity and corrosiveness. For example, benzene is used to separate phenols in coal tar; separation of olefins from petroleum fractions with organic solvents; Br2 in water was extracted with CCL4

Solid-liquid extraction, also known as leaching, uses solvents to separate components in a solid mixture, such as sugars in sugar beets with water; Soybean oil in soybeans is soaked with alcohol to increase oil yield; Extracting the active ingredient from Chinese medicine with water to make a flow extract is called "leaching" or "leaching".

"Extraction" means the use of a solvent to dissolve a soluble solute in another solid or liquid phase for separation or purification. If ether is added to an aqueous solution containing uranium nitrate, the uranyl nitrate can be transferred to the ether, leaving impurities in the water.

Solvent treatment to remove soluble substances.

Extraction is carried out by using the different solubility of the same solute in different solvents, for example, iodine is easily soluble in carbon tetrachloride and slightly soluble in water, so if the water contains a small amount of iodine, you can add carbon tetrachloride solution, shake, stand and stratify, then the iodine contained in the water will be in carbon tetrachloride. It is generally required that the solubility of the solute in the extractant is greater than that of the original solution during extraction.

It is the extraction of iodine from water into a carbon tetrachloride solution to increase its concentration without changing the properties of iodine.

Suppose there is substance A, soluble in solvent B and solvent C, but its solubility in B is less than in solvent C. If C is added to a celery solution consisting of A and B, A that was originally dissolved in B will enter C, and this process is called extraction.

For example, the solubility of iodine in water is less than that in CCL4, and if CCL4 is added to iodine water, all the iodine that was originally dissolved in water will be transferred to the water. The purpose of extraction is to separate iodine from water-soluble impurities, and pure iodine can be obtained by distillation after extraction.

For extraction, a separating funnel and a beaker should be prepared. Taking the above experiment as an example, iodine water and CCL4 are poured into the separating funnel together, shaken well and let stand, and after the stratification occurs (because the density of CCL4 is greater than that of water, the lower layer is purple-red, and the upper coarse first layer is colorless and water), the iodine CCL4 solution is released from the lower mouth of the separating funnel, and the water is poured out from the upper mouth, and the operation is completed.