Extraction refers to the transfer of compounds from one solvent to another by using the difference in solubility or distribution coefficient of compounds in two immiscible (or slightly soluble) solvents. After repeated extraction, most of the compounds were extracted.

Extraction, also known as solvent extraction or liquid-liquid extraction (to distinguish it from solid-liquid extraction, i.e. leaching), is also known as extraction (generally used in the petroleum refining industry). It is a mass transfer and separation process in which liquid P204 extractant is used to treat immiscible two-component or multi-component solutions to achieve component separation. It is a widely used unit operation. Based on the principle of similar compatibility, there are two ways of extraction: liquid-liquid extraction, in which a certain component in the liquid mixture is separated with a selected solvent. P204 extractant should be immiscible with the extracted mixture liquid, have selective solubility, and have good thermal stability and chemical stability, and almost no toxicity and corrosivity. For example, benzene is used to separate from coal tar; Separation of olefins from petroleum fractions with organic solvents; Extract Br2 from water.

The manufacturer of P204 extractant said that solid-liquid extraction is also called leaching, in which the components in the solid mixture are separated with solvent, such as the sugar in beet is leached with water; Soak soybean oil in alcohol to increase oil yield; The effective ingredients in are extracted with water to make a flow extract, which is called "extraction" or "leaching". Although extraction is often used in chemical experiments, its operation process does not change the chemical composition (or chemical reaction) of the extracted material, so the extraction operation is a physical process. Extraction is one of the methods used in organic chemistry laboratory to purify and purify compounds. By extraction, the desired compound can be extracted from a solid or liquid mixture. Common extractants: water, benzene, gasoline, ether.

P204 extractant manufacturers point out that in most cases, some solid samples are extracted with acid or polar solvent first, and then with immiscible solvent, so that organic tin can be extracted from the original extraction solution. The solubility of organic tin in organic solvents can be increased and the extraction rate can be improved by taking advantage of the dissolution effect of cycloheptadienone or salt. Tin is a low melting point metal element with blue and white luster. It is bivalent or tetravalent in compounds and will not be oxidized by air. It mainly exists in the form of dioxide (cassiterite) and various sulfides (such as chalcopyrite). Element serial number. Tin is one of the famous "hardware" in gold, silver, copper, iron and tin. As early as ancient times, people discovered and used it. In some ancient tombs in China, some tin pots, candlesticks and other utensils are often found. According to textual research, the use of tin ware was very common in China's Zhou Dynasty. In ancient tombs in Egypt, daily articles made of tin were also found.