What are the main uses of P-diethylbenzene?
P-diethylbenzene (p-diethylbenzene) is an organic compound with a wide range of main uses.
First, in the field of chemical synthesis, it is often used as a raw material for the preparation of various organic compounds. If it undergoes a specific chemical reaction, it can be converted into substances with special structures and properties, which are indispensable in the pharmaceutical, dye, fragrance and other industries. In the preparation of medicine, the reactions it participates in may be a key step in the construction of drug active molecules, helping to synthesize drugs with specific curative effects; in the production of dyes, it can generate dyes with bright color and good stability through series transformation.
Second, in the petrochemical industry, p-diethylbenzene is of great significance. In the petroleum refining process, it is one of the important components. In addition, it can optimize the performance of oil products, improve the quality of oil products, and meet the strict requirements of oil products in different fields through reactions such as isomerization and alkylation.
Third, in the field of materials science, diethylbenzene is also used. It can be used as a monomer or modifier to participate in the synthesis and modification of polymer materials. By polymerizing with other monomers, polymer materials are endowed with unique properties, such as improving the heat resistance and chemical corrosion resistance of materials, and then broadening the application range of polymer materials, playing a key role in high-end fields such as aerospace and automobile manufacturing.
To sum up, p-diethylbenzene plays an important role in many fields such as chemical industry, petroleum, and materials, and has made significant contributions to the development of various industries.
What are the physical properties of P-diethylbenzene?
P-diethylbenzene has many physical properties. It is a colorless liquid with a fragrant smell. At room temperature and pressure, the density is slightly lighter than that of water, about 0.86 grams per cubic centimeter. It is insoluble in water, but it can be miscible with most organic solvents, such as ethanol, ether, etc. It is like oil floating in water, not fused, but mixed with other oils.
Its boiling point is about 181 ° C, and its melting point is about -42 ° C. Those with a boiling point, such as boiling water in a kettle, liquefy into gas when they reach this temperature; those with a melting point, like the world of ice melting, solidify into liquid at this point.
The vapor of P-diethylbenzene is heavier than air, and can spread to a considerable distance at a lower place. When it encounters a fire source, it will ignite immediately, and it is flammable. It is like a lurking fire, and it will cause an explosion if you are not careful. Its flash point is about 56 ° C. The flash point, such as the critical point of flammable materials, is the lowest temperature at which fire can flash. Near this temperature, extra caution is required to prevent ignition sources such as open fire and static electricity.
The refractive index of this substance is about 1.495. When light passes through, the direction changes, and the refraction state can be measured according to this number, just like light traveling between different media, and the path changes accordingly. All kinds of physical properties are important considerations in various fields such as chemical engineering and scientific research, and are relevant to their application, storage, and transportation.
What is the production method of P-diethylbenzene?
P-diethylbenzene is also an organic compound. The methods for its preparation have been varied throughout the ages, and the common methods are described here.
First, the alkylation method. Benzene and ethylene are used as raw materials, and under the action of suitable catalysts, the alkylation reaction is carried out. Among these catalysts, zeolite molecular sieves are often preferred, because of their shape-selective catalytic characteristics, the reaction can selectively generate P-diethylbenzene. During the reaction, temperature control and pressure control are required to mix benzene and ethylene in an appropriate ratio. The temperature is about 200-300 degrees Celsius, and the pressure is 1-3 trillion Pa. Benzene and ethylene are put into the reaction kettle. Under the catalysis of the catalyst, the double bond of ethylene is opened and connected with the benzene ring to produce ethylbenzene. Ethylbenzene reacts with ethylene, and then forms a mixture of diethylbenzene isomers. After distillation and other means, separation and purification can obtain high purity P-diethylbenzene.
Second, the isomerization method. Using m-diethylbenzene or o-diethylbenzene as the starting material, under the action of a specific isomerization catalyst, the structure of the structure is rearranged. The catalyst used may be an acidic molecular sieve of the supported metal. In the reaction system, the atomic connection mode of m-diethylbenzene or o-diethylbenzene molecules changes and gradually converts to P-diethylbenz This process also requires fine regulation of the reaction conditions, the temperature is about 150-250 degrees Celsius, and the pressure is maintained at 0.5-1.50 trillion Pa. After the isomerization reaction, the product is treated with distillation, adsorption separation and other techniques to obtain pure P-diethylbenzene.
Third, the dealkylation method. Polyethylbenzene is used as a raw material, and in the presence of a catalyst, the dealkylation reaction is carried out. The ethyl group on the polyethylbenzene molecule is shed from the benzene ring under suitable conditions. The catalyst used for this reaction, or modified alumina, etc. The reaction temperature is quite high, about 400-500 degrees Celsius, and the pressure is relatively low, at 0.1-500 billion Pa. Polyethylbenzene is partially converted into P-diethylbenzene through dealkylation reaction, and by-products such as benzene are also formed. Subsequent separation technology is used to remove by-products and enrich P-diethylbenzene to the desired purity.
What are the precautions for P-diethylbenzene in storage and transportation?
P-diethylbenzene is also a chemical substance. During storage and transportation, many matters must be paid attention to.
First words storage, this substance should be placed in a cool and ventilated warehouse. Cover its flammable nature. If it is placed in a high temperature or unventilated place, it is easy to cause fire in case of fire source. The warehouse temperature should be controlled at an appropriate degree to avoid its volatilization intensification due to excessive temperature, or other chemical reactions. And the warehouse must be kept away from fire and heat sources, and smoking is strictly prohibited. This is the priority of flame prevention and explosion prevention.
Furthermore, it should be stored separately from oxidants and edible chemicals, and must not be mixed. Due to the encounter between P-diethylbenzene and the oxidizing agent, it is easy to cause violent chemical reactions, or the risk of explosion; if it is mixed with edible chemicals, it may contaminate food and endanger public health. At the same time, the warehouse should have suitable materials to contain the leakage, in case of accident, it can be disposed of in time, so as not to spread and endanger the environment.
As for transportation, the transportation vehicle must be thoroughly cleaned and disinfected, and no other chemical substances must be left to prevent reaction with P-diethylbenzene. During transportation, make sure that the container does not leak, collapse, fall or damage. The driving route must also be reasonably planned to avoid sensitive areas such as water sources and densely populated areas. Transportation personnel should also be familiar with its characteristics and emergency response methods. In case of emergencies, they can respond calmly and deal with them in a timely manner. In this way, P-diethylbenzene can be guaranteed to be safe during storage and transportation.
What is the environmental impact of P-diethylbenzene?
P-diethylbenzene is also a chemical substance. If this substance is exposed to the environment, its impact is not small.
P-diethylbenzene is toxic, enters the environment, or causes air pollution. If inhaled, people are afraid of respiratory problems, coughing, shortening, and serious lung diseases. And this substance is photochemical reaction, which can contribute to ozone and other harmful effects, endangering human health and environmental conditions.
If it flows into the water, its hydrophobicity makes it attached to the sediment or sediment, and affects aquatic organisms. And other organisms enter, physiological functions or damage, reproductive, immune and other systems are all harmed by it. In addition, the bioconcentration of high-quality food is higher, and the balance of aquatic systems is improved.
In soil, P-diethylbenzene can degrade, or affect the activity of soil microorganisms, preventing the circulation and differentiation of soil materials. Plant roots absorb, inhibit its growth and fertility, causing crop damage and product decline.
As a result, P-diethylbenzene is released in the environment, which is harmful to the environment, water, soil and organisms. We are careful to prevent it from polluting the environment.
