Regarding the question of extraction, how to separate the solvent from the solute after extraction

Extraction is a means of separation, then your purpose is to separate the things mixed with iodine, that is to say, there must be something else in your water, so you have to use CCL4 to bring out I, and then carry out other operations, at this time, only I can carry out the reaction in CCL4, if there is only I in the water, then of course it can be distilled directly, and there is no need to operate later.

Ccl4 and water are insoluble, and Ccl4 is underneath the water.

So separate them by dispensing.

That is, use the separating funnel to let the CCL4 flow down first, and only leave the water in the funnel, which is easy to operate.

But iodine and CCL4 don't.

Moreover, the boiling point of CCL4 is higher, so it can be distilled.

The role of solvents in extractive distillation.

1. Change the relative volatility of the original components in the desired direction and have the greatest possible relative volatility. When the non-ideality of the separated system is large, and it is difficult to separate in a certain concentration range, after adding the solvent, the concentration of the original components decreases, and the interaction between them is weakened, as long as the concentration of the solvent is large enough, the contribution of the difference in vapor pressure of the two components to the relative volatility is highlighted, and the separation of the original system is realized. In this case, the solvent mainly plays a dilution role.

2. When the boiling points of the original two components A and B are similar and the non-ideality is not large, if the relative volatility is close to 1, it cannot be separated by ordinary distillation. After the solvent is added, the solvent and component A form a non-ideal solution with a strong positive deviation, and form a negative deviation solution or ideal solution with component B, so as to improve the relative volatility of component A to component B, so as to realize the separation of the original two components.

Screening method for suitable solvent design of extractive distillation process:

The main index of solvent screening is to seek the best selectivity of the solvent for the isolate line, which indicates the degree to which the solvent changes the relative volatility of the separated components. The relative volatility of component A(1) to component B(2) after the addition of solvent and without the addition of solvent is expressed as 12 and 012, respectively, and the ratio of the two is called selectivity S.

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 kind of mass transfer and separation process that uses liquid extractants to treat immiscible two-component or multi-component solutions to achieve component separation. 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; Extract water with CCL4 to remove high BR2Solid-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 tests, its operation does not cause a change in the reputation (or chemical reaction) of the chemical composition 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. Here is a description of commonly used liquid extractions.

Hello dear, I've been waiting for a long time, I'm glad to answer for you. Because extraction is one of the methods used to purify and purify compounds in organic chemistry laboratories, the required compounds can be extracted from solid or liquid mixtures; By taking advantage of the difference in solubility or partition coefficient of the compound in two solvents with incommiscible chains, the compound is transferred from one solvent to another, and most of the compounds can be extracted after repeated extraction. Hope mine is helpful to you

"Extraction resistance to evacuation" is the use of solvent which properties are different and the operation bridge width?

a.Solubility.

b.Density. Correct Answer: a

1. The extracted substance has high solubility in solvent.

2. The extracted substance does not react with the solvent.

3. The solvent is not miscible with the solvent where the extracted substance was originally located.

Extraction, also known as solvent extraction or liquid-liquid extraction, is a unit operation that uses the different solubility of components in a system in a solvent to separate a mixture. That is, the 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 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. 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 chain 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 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 substance can be extracted from a solid or liquid mixture.

Summary. Pro-<>

The difference between a pre-extraction and a post-extractant is the concentration and purity of the target compound (i.e., the substance to be extracted) that it contains.

The difference between the extractant before extraction and the extractant after extraction.

The difference between the pre-<> extraction and the post-extraction extract is the concentration and purity of the target compound (i.e., the buried substance to be extracted).

The pre-extractant is usually a pure solubilizer that has not interacted with the target compound in the sample, which has a very low concentration in the slag ridge and may be interfered with by other impurities.

The extractant after extraction contains the target compound extracted from the sample, and after multiple extractions, the concentration and purity of the target compound will gradually increase.

As a result, post-extraction extractants are generally more targeted and efficient than pre-extraction extractants.

The extraction separation is based on the principle of "similar dissolution". Missing Tomb ().

a.That's right. b.Be cautious of mistakes.

Correct Answer: B