(E) What is the main use of 1,2-difluoroethylene?

(E) What are the main uses of (E) 1,2-dichloroethylene?

(E) 1,2-dichloroethylene, with cis-trans isomerism, has a wide range of uses. In the field of industry, one can be used as an organic solvent. Because of its good solubility to many organic compounds, it is often used in the production process of coatings, adhesives, inks, etc. For example, when preparing some high-grade coatings, using it as a solvent can make the components of the coating uniformly disperse, and the effect after film formation is good, the color is uniform and has a certain luster. Second, this substance is an important raw material for organic synthesis. In the organic synthesis reaction, it can be converted into other complex organic compounds through a series of reactions. For example, by reacting with specific reagents, other functional groups can be introduced to build more complex molecular structures for the synthesis of pharmaceutical intermediates, laying the foundation for the preparation of many drugs. Third, in the field of electronics industry, (E) 1,2-dichloroethylene can be used to clean electronic components. Because of its good volatility and strong solubility to oil and impurities, it can effectively remove dirt on the surface of electronic components, ensure stable performance of electronic components, and improve the quality and reliability of electronic products. In short, (E) 1,2-dichloroethylene plays an important role in many fields and contributes greatly to industrial production and technological development.

(E) What are the physical properties of 1,2-difluoroethylene?

(E) -1,2-dichloroethylene, also known as cis-1,2-dichloroethylene, is an organic compound. Its physical properties are quite unique, and it has important uses in many fields. The following is for you.

Under normal temperature and pressure, this substance appears as a colorless and slightly fragrant liquid, like a hidden elf in the world, quiet and charming. Its boiling point is about 60.3 ° C, just like a precise and punctual dancer, sublimating gently at a specific temperature. The relative density is 1.2837, which is more dignified than water, as if carrying the secret of years of precipitation. It is slightly soluble in water, but highly soluble in organic solvents such as ethanol and ether, just like a smart wanderer who has found a home in the embrace of organic solvents.

Furthermore, (E) -1,2-dichloroethylene also has relatively stable chemical properties. However, it should be noted that its steam and air can form explosive mixtures, which can cause combustion and explosion in case of open flames and high heat, just like a potentially dangerous fire, and a little carelessness can cause disaster.

It is because of its unique physical properties that (E) -1,2-dichloroethylene shines in the industrial field. It is often used as an intermediate in organic synthesis to help the birth of various complex organic compounds. At the same time, it also plays an indispensable role in coatings, adhesives and other industries, giving these products special properties.

However, be extremely cautious when using. Because of its certain toxicity, it poses a potential threat to human health. During operation, safety regulations must be strictly followed and protective measures must be taken to ensure foolproof.

Is (E) -1,2-difluoroethylene chemically stable?

(E) 1,2-dichloroethylene, its chemical properties are stable?

Answer: (E) 1,2-dichloroethylene, also known as trans-1,2-dichloroethylene. The chemical properties of this substance are relatively stable. Because of its molecular structure, chlorine atoms are symmetrically distributed on both sides of the double bond, causing the molecular dipole moment to be almost zero, and the intermolecular force is weak, which is one of the reasons for its chemical stability.

And the existence of double bonds makes the molecule unsaturated. However, due to the electron-absorbing effect of chlorine atoms, the electron cloud density of the double bond decreases, making it difficult to occur electrophilic addition reactions, which increases its stability. Under normal conditions, it can exist stably in the air and is not prone to chemical reactions on its own.

However, under certain conditions, in case of high temperature, strong oxidizing agent or catalyst, it can also participate in chemical reactions. For example, under suitable catalysts and temperatures, it can react with hydrogen to generate 1,2-dichloroethane; in case of strong oxidizing agents, such as potassium permanganate, its double bonds may also be oxidized to cause structural changes.

In summary, the chemical properties of (E) 1,2-dichloroethylene are relatively stable, but not absolutely stable, and chemical reactions can still occur under specific conditions.

What are the preparation methods of (E) -1,2-difluoroethylene?

(E) -1,2-dibromoethane is a common raw material for organic synthesis. The preparation method is as follows:

First, it is prepared by addition of ethylene and bromine elemental. This is a common laboratory preparation method. Although this method is not contained in "Tiangong Kaizi", according to the current chemical principle, ethylene contains carbon-carbon double bonds and is active in nature. Ethylene gas is introduced into bromine water or bromine carbon tetrachloride solution, and the bromine-bromine bond in the bromine molecule is polarized by the electron cloud of the ethylene double bond, and then an addition reaction occurs. The reaction equation is:\ (CH_ {2} = CH_ {2} + Br_ {2}\ rightarrow CH_ {2} BrCH_ {2} Br\). The reaction conditions are mild, only room temperature and pressure are required, and the product purity is high.

Second, it can be prepared from ethanol as raw material. First, ethanol is eliminated under the action of concentrated sulfuric acid at\ (170 ^ {\ circ} C\) to produce ethylene. The chemical equation is:\ (CH_ {3} CH_ {2} OH\ xrightarrow [170 ^ {\ circ} C] {concentrated sulfuric acid} CH_ {2} = CH_ {2}\ uparrow + H_ {2} O\). Then the generated ethylene is added to the bromine elemental substance to obtain 1,2-dibromoethane. Although this route is a little complicated, it has a wide range of ethanol sources and low cost.

Third, acetylene is used as the raw material. First, acetylene is added to an appropriate amount of hydrogen to generate ethylene. If the amount of hydrogen is properly controlled, ethylene can be mainly generated, and then ethylene and bromine are added to obtain the target product. However, this process requires precise control of the reaction conditions and the amount of hydrogen, otherwise it is easy to generate by-products such as ethane.

(E) Precautions for storage and transportation of 1,2-difluoroethylene

When storing and transporting (E) -1,2-divinylbenzene, there are several things to pay attention to, which must not be ignored.

Its flammable nature, when storing, the choice of place must be cautious. It should be placed in a cool and well-ventilated place, away from fire and heat sources, so as not to ignite and cause disaster. In the warehouse, the temperature and humidity should also be well controlled. The temperature should be stable in a specific range, and the humidity should not be too high to prevent its properties from changing.

When transporting, the equipment used must be appropriate. The container should be solid and well-sealed to prevent it from leaking. The transportation vehicle should also be equipped with perfect fire and leak emergency treatment equipment for emergencies. The escort must be familiar with its dangerous characteristics and emergency response methods, and proceed with caution along the way.

Furthermore, this substance is toxic to a certain extent. Whether it is stored or transported, it must be prevented from leaking into the environment, so as not to endanger the surrounding life and nature. If a leak occurs unfortunately, act immediately according to the established emergency plan, evacuate the surrounding people, quickly block the source of the leak, properly clean up the leak, and must not let it spread.

Personnel operating this substance must undergo strict training and be familiar with the operating procedures. When operating, protective equipment such as gas masks and protective gloves must be worn neatly to protect themselves from its harm. In this way, safe storage and transportation can be maintained.