2,3-Cyclohexenopyridine

"Tiangong Kaiwu" says: "Where sulfur is combined with nitrate, then gunpowder becomes sound." Sulfur is mentioned here, its strong nature, burns in case of fire, and has a pungent smell. Today's 2,3-ethylene oxide, although not ancient, but its physical and chemical properties can also be described.
2,3-ethylene oxide, a colorless and transparent liquid, has an ether-like odor. Its boiling point is quite low, about 35 ° C, and it is very volatile into a gas. This property makes it easy to spread in the surrounding space under normal temperature and pressure. And its vapor is heavier than air, and can spread to a considerable distance at a lower place. It can be reignited in case of a fire source, which is a major danger.
Furthermore, 2,3-ethylene oxide is flammable and explosive. Its flash point is very low, and it can cause combustion and explosion in case of open flame and high heat. It can react strongly with oxidants, and even in the case of heat, impact, etc., it is also at risk of explosion. Due to the epoxy bond in its molecular structure, this structure is active, making its chemical properties more active and can react with many substances.
In addition, 2,3-ethylene oxide is toxic and harmful to the human body. Inhalation of its vapor can cause respiratory irritation and even pulmonary edema; skin contact can cause burns; if it is not carefully entered into the eyes, it is especially harmful. Therefore, when using and storing, be careful and strictly follow safety procedures to prevent accidents. These are all important physical and chemical properties of 2,3-ethylene oxide, which cannot be ignored.

"Tiangong Kaiwu" says: "All lime is burned and refined by fire. After it is formed, it will never be damaged if it enters the water. Hundreds of millions of boats, hundreds of millions of walls, choking gaps to prevent adultery, it must be done." This so-called lime, because it is calcined by fire, has unique chemical properties.
First, lime reacts violently when it meets water, forming slaked lime and releasing a large amount of heat. This reaction can be as follows: CaO + H2O O = Ca (OH) -2. In this process, the release of heat is considerable. For example, the ancients used it to cook food quickly, or to warm it in winter. Although it is not a common method, it is still sufficient to show that its heat is available.
Second, slaked lime is alkaline. It can slowly react with carbon dioxide in the air to regenerate calcium carbonate. The chemical formula of this reaction is: Ca (OH) 2O + CO 2O = CaCO
+ H2O O. Therefore, plastering the wall with lime will become stronger over time, because the hard shell of calcium carbonate gradually forms on the wall, which can keep the wall for a long time.
Third, lime can be used for water purification. Sprinkling an appropriate amount of lime in the water can settle impurities, adjust the pH of the water, and make it suitable for drinking or irrigation. This is the ingenious use of lime chemistry in the way of water control and water use by the ancients.
Fourth, lime is also widely used in many industries such as metallurgy and tanning. In metallurgy, it can help melt ore and remove impurities; in tanning, it can remove hair and soften leather, all of which are indispensable to Baigong's skills due to its chemical properties.

To make dichloropropane, there are two common methods. First, propylene reacts with chlorine in a high-temperature gas phase environment. The structure of the propylene molecule is unique, and its allyl hydrogen is active. When chlorine gas encounters it in the high-temperature gas phase, chlorine atoms preferentially replace allyl hydrogen to form 3-chloropropene, and then 3-chloropropene is added to chlorine gas to obtain dichloropropane. The beauty of this process is that the high-temperature gas phase conditions enable the reaction to selectively occur at the allyl position and reduce the disturbance of other side reactions.
Second, using 1,2-dichloropropane as a raw material, it is prepared by isomerization reaction. 1,2-Dichloropropane can be formed by rearranging the positions of chlorine atoms in the molecule under suitable catalyst and reaction conditions. The key to this method is to find a suitable catalyst to efficiently promote the isomerization reaction, and at the same time control the reaction conditions to make the reaction proceed in the direction of generating the target product.
These two methods have their own advantages and disadvantages. The gas phase reaction method has good selectivity, but the reaction conditions are strict; the raw materials for the isomerization method are available, but the selection and reaction control of the catalyst need to be carefully studied. Those who produce dichloropropane should choose carefully according to their own conditions and needs.

Today there are two, two, three, cyclohexene and ask where it is applied?
Cyclohexene, that is, propylene oxide. This substance has a wide range of uses and has its impact in various fields.
In the field of chemical synthesis, propylene oxide is an important organic raw material. It can be used to prepare polyether polyols, which are the key raw materials for the production of polyurethane. Polyurethane is widely used, such as foam plastics, which are indispensable in building insulation, furniture cushions, etc.; and elastomers, which play an important role in automobile tires, soles and other products. Propylene oxide can also be used to make propylene glycol. Propylene glycol is widely used in food, medicine, cosmetics and other industries. It can be used as a moisturizer and solvent in the food industry. It can be used as a drug carrier in the pharmaceutical industry. In the cosmetic industry, it can help maintain product humidity.
In the field of surfactants, propylene oxide can be used to make non-ionic surfactants. Such surfactants are widely used in detergents, emulsifiers, dispersants and other products. In detergents, it can enhance the decontamination ability and make clothes clean; in emulsifiers, it can evenly mix oil and water, which plays an important role in many industrial production and daily product manufacturing; in dispersants, it can evenly disperse solid particles in liquids to ensure product quality and stability.
In the field of electronic chemistry, propylene oxide is also used. It can be used to make electronic chemicals, such as photoresist solvents. Photoresists are extremely critical in semiconductor manufacturing processes. Propylene oxide as a solvent can affect the performance of photoresists, which in turn affects the manufacturing accuracy and quality of semiconductor chips, which is of great significance to the development of the electronics industry.
In summary, propylene oxide has important applications in chemical synthesis, surfactants, electronic chemistry and many other fields, and plays a role in promoting the development of various industries.

Today, there are two or seven out of three. What is the appearance of cyclohexane in the city?
Cyclohexane is a genus of organic compounds. It is colorless and has a special odor. It is a liquid at room temperature. Looking at the scenery of its city, it has a wide range of uses. First, in the chemical industry, it is essential for the preparation of adipic acid, caprolactam, etc., both of which are crucial for the production of synthetic fibers such as nylon. Nylon is used in all aspects of clothing and industrial silk. It is based on cyclohexane. Second, as a solvent, it is used in coatings, inks, adhesives and other fields. Because of its strong solubility and volatility, it can make the ingredients mix evenly to ensure the quality of the product.
As for market supply and demand, with the advancement of the economy, the scale of the chemical industry is gradually expanding, and the demand for cyclohexane is also increasing. However, on the supply side, its production technology is mature, and its production capacity continues to expand. Chemical companies compete to increase production in response to market demands. However, it is also influenced by the price of crude oil. Crude oil is the source raw material for cyclohexane production. The fluctuation of oil prices causes fluctuations in the cost of cyclohexane, which in turn affects its market price.
Furthermore, the market competition is fierce. Many chemical manufacturers are competing for this, each seeking high-quality products and suitable prices to occupy the market seat. At the same time, environmental regulations are becoming more and more stringent, and the emission and treatment of cyclohexane in the production process need to be compliant. This is also a challenge faced by the industry, which prompts enterprises to innovate in production technology to reduce pollution, reduce emissions, and follow the trend of green development. In this way, the city scene of cyclohexane, with both opportunities and challenges, evolves dynamically.