5-bromobenzothiophene-2-carbonitrile

Methyl ether is an organic compound. Its physical properties are unique and it has applications in many fields.
Looking at its shape, under normal temperature and pressure, methyl ether presents a gaseous state. Its color is transparent, seemingly invisible, and difficult to perceive by human vision. However, its smell has a special aromatic aroma, and it can be sensed when smelled.
When it comes to boiling point, the boiling point of methyl ether is extremely low, about -24.9 ° C. This property makes it very easy to gasify at room temperature. If placed in a slightly warm place, it quickly changes from liquid to gaseous state and quietly escapes into the air. Its melting point is also quite low, about -141.5 ° C. At lower temperatures, it can condense into a solid state.
The density of methyl ether is slightly heavier than that of air, about 1.977g/L. When methyl ether is released into the air, it will slowly settle due to its density, and the concentration near the ground is relatively high. This point needs to be carefully considered in practical applications and safety precautions.
Furthermore, the solubility of methyl ether also has characteristics. It is soluble in water and can be dispersed to a certain extent in water. And it also shows good solubility in organic solvents, such as ethanol, ether, etc., and can be miscible with these organic solvents to form a uniform mixed system.
The physical properties of methyl ether make it important in industrial and civil applications. Due to its low boiling point and easy gasification, it can be used as a propellant for aerosols; because it can be dissolved in a variety of organic solvents, it can be used as a reaction medium in the field of chemical synthesis to assist in the progress of various chemical reactions.

Argon is a colorless and odorless inert gas. Its chemical properties are very stable, and under normal circumstances, it is extremely difficult to chemically react with other substances.
Looking at the properties of various elements, the electron layer structure of argon is particularly stable, and its outermost electron number is full, which makes it have no tendency to gain or lose electrons. Therefore, under normal conditions, it hardly participates in chemical changes. Due to its stability, it is often used to isolate the active material. For example, when welding, argon is used as a protective gas to protect the molten pool and weld, preventing it from reacting with oxygen and nitrogen in the air and causing damage to the quality of the weld. < Br >
Although argon is chemically stable, it is not impossible to react under extreme conditions, such as extremely high temperatures, pressures, or strong electromagnetic fields. Scientists have produced compounds containing argon in specific experimental environments, all of which rely on very special conditions, which are difficult to achieve under normal circumstances.
In the metallurgical industry, argon is also very useful. It can be blown into molten steel to remove hydrogen, oxygen, and non-metallic impurities to improve the purity and quality of steel. This is due to the stable chemical properties of argon, which does not easily react with the elements in steel, but can be removed by physical action. In short, argon, with its stable chemical properties, plays an important role in many fields. Although it is difficult to react chemically, its unique properties bring great convenience to industrial production and scientific research in specific scenarios.

The common method for synthesizing methyl ether is described above. For methyl ether, the formula is\ (C_ {2} H_ {6} O\), also known as dimethyl ether.
One is the methanol dehydration method. The ancient method used sulfuric acid as a dehydrating agent to dehydrate methanol to form methyl ether. The reason for the reaction is that methanol\ (CH_ {3} OH\) under the catalysis of sulfuric acid, two molecules of methanol remove a molecule of water, and then form methyl ether\ (CH_ {3} OCH_ {3}\). However, sulfuric acid is highly corrosive, which damages the equipment even more, and the product separation is not easy, and it is gradually replaced by other methods.
Nowadays, solid acid is used to catalyze the dehydration of methanol. Such as using γ-alumina, molecular sieve, etc. as catalysts. This solid acid catalyst has the advantages of high activity, good selectivity, and little corrosion to equipment. Methanol vapor is efficiently converted into methyl ether through a reactor filled with such catalysts at a suitable temperature and pressure. At the time of reaction, the temperature is about 200-300 ° C, and the pressure is about 0.5-1.5MPa.
The second is the direct synthesis of synthesis gas. Syngas is a mixture of carbon monoxide and hydrogen. A special catalyst is used to directly react synthesis gas to generate methyl ether. This process involves the continuous reaction of carbon monoxide hydrogenation, methanol synthesis and methanol dehydration. The catalysts used are mostly bifunctional catalysts, which have both the active center of synthesis of methanol and methanol dehydration. For example, using\ (Cu-Zn-Al\) as the active component of methanol synthesis and compounding with\ (HZSM-5\) molecular sieve and other dehydrated components. This method has a wide range of raw materials and can be gasified from coal, natural gas and biomass to obtain synthesis gas. The process is short and the energy consumption is reduced, which is an important development direction for methyl ether synthesis. However, the performance of the catalyst is high, and better catalysts need to be developed to improve the reaction efficiency and selectivity.

Those who eat, are related to people's livelihood, and are the most important. Grains, fruits and vegetables, and poultry and livestock are all materials for meals, and their uses are also extensive.
Those who bear the brunt are also effective in nourishing the body and strengthening the body. The "Huangdi Neijing" says: "The five grains are nourishing, the five fruits are helping, the five animals are beneficial, and the five vegetables are filling." The grain can be full, the fruit can produce fluid, the animals can nourish the body, and the vegetables can be sparse. A reasonable diet can make the qi and blood unobstructed, the organs and organs reconciled, and the evil can not be dried. Such as japonica rice, which is peaceful in nature, can nourish the middle and nourish qi, nourish the spleen and stomach; longan meat, which is sweet and warm in taste, can nourish the heart and spleen, nourish the blood and calm the nerves. Eat it often, the body is
Furthermore, the meal is also about the exchange of human feelings. On the day of the festival, the family reunites and the delicacies are listed. A bowl of hot soup and several plates of delicacies are not only for the enjoyment of the stomach, but also for the warmth of the family. Such as dumplings during the Spring Festival, zongzi during the Dragon Boat Festival, and moon cakes during the Mid-Autumn Festival, they are all festive meals, carrying the inheritance of the family and the atmosphere of the festival. When the guests are at the banquet, they cook delicious meals to show respect. The delicacies of the mountains and seas are mixed with land and water. The guests and the host are happy, and the friendship is also enhanced between the cups and the taste of food.
In addition, the inheritance of food and culture is also closely linked. There are unique meals in various places, reflecting the local customs and historical evolution. The spiciness of Sichuan cuisine originates from the dampness of the Shu land, which can remove dampness and dissipate cold, and also highlights the heroic and enthusiastic nature of the Shu people; the fineness of Cantonese cuisine is related to the wealth and delicacy of Lingnan culture. One side of water and soil nourishes one person, and the other side of the meal also inherits the culture of the other side.
From this perspective, the use of meals is not only for filling the stomach, but also for health, human feelings and culture. Those who are good at eating can nourish themselves, be close to each other, and pass on literature. This meal is a great use.

The man takes stone as a boat and water as a way to travel between rivers, lakes and seas. This is the power of the boat. In today's words, acetylene, in the way of storage and transportation, there are many things to pay attention to.
When storing, the first heavy container is strong. Acetylene is strong. If the container is slightly damaged, it is easy to leak. In case of open flames and hot topics, it will definitely cause disaster. Therefore, when choosing a special cylinder, its material is tough and tightly sealed, so that the acetylene can be kept stable inside. And the cylinder must be checked regularly to see if it has rust or cracks. If so, it should be replaced quickly and not be delayed.
Furthermore, the storage place should also be carefully selected. It should be placed in a cool and ventilated place, away from fire and heat sources. Due to the heating of acetylene, the pressure will rise. If too much heat accumulates, the cylinder may burst. And it should not be stored with oxidants, acids, etc., to prevent chemical reactions and accidents.
As for the transportation, it should not be ignored. The transportation vehicle should be equipped with corresponding fire equipment, and the escort must be familiar with the properties of acetylene. In case of emergencies, it can be handled calmly. During driving, avoid bumps and collisions to prevent damage to the cylinder.
In addition, the transportation route should also be carefully planned to avoid densely populated places and important facilities. And when transporting, warning signs should be hung as required to make everyone aware of the risks, so as to ensure the safety along the way.
In short, the storage and transportation of acetylene is related to safety and must not be sloppy at all. All rules must be followed and all matters must be paid attention to in order to ensure all things go smoothly and avoid disasters.