What are the main uses of α,α,α -

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, which shows many processes and technologies with rich content and detailed records. About “α，α，α - -triene m-xylene " (this expression may be wrong, speculated to be a chemical professional related term, the ancient chemical concept is very different from today), in the era of" Tiangong Kaiwu ", the relevant content of this chemical substance may not be involved.

" Tiangong Kaiwu "focuses on recording agricultural and handicraft technologies, such as the article on grain crop cultivation, the article on silk cotton and linen textile printing and dyeing, the article on ceramics, and the article on metal casting. The book covers many production technical details such as crop cultivation, sericulture and silk reeling, salt making, coal mining, oil extraction, papermaking, etc. The purpose is to summarize and inherit the practical skills of the time, and promote the development of economy and people's livelihood.

Although there were chemistry-related practices in ancient times, such as alchemy, which has a certain exploration of metal smelting and drug production, it is very different from the modern chemical concept system 。“α，α，α - organic compounds with fine structures such as triene-m-xylene ", which were far from being touched at that time. Ancient chemical practices were based on experience and lacked the support of modern scientific theories, making it even more difficult to have in-depth understanding and application of specific complex organic compounds. Therefore, as far as" Tiangong Kaiwu "is concerned, it is difficult to find a description of the use of this substance.

What are the physical properties of α,α,α -

The physical properties of the three-river methyne referred to by Fu α, α, and α are quite comprehensible.

This three-river methyne, under normal conditions, is mostly gaseous. Its color is clear and odorless, and it exists as a gas in an environment at room temperature and pressure. Its density is smaller than that of air. If placed in an open space, it often floats on air.

When it comes to solubility, the three-river methyne is insoluble in water. This property makes it exist in an independent gas phase in a water environment, and its affinity with water is rather weak. However, in some organic solvents, it has a certain solubility, such as some fat-soluble solvents, which can accommodate this methyne.

In addition, the melting boiling point of trihedral methyne is low. Its melting point is extremely low, and it is easy to change from solid to liquid in case of a little heating; the boiling point is also not high, and it can be turned into gaseous state under relatively mild heating conditions. This characteristic is due to the weak intermolecular force, and the molecules are easy to break free from each other.

In addition, the thermal conductivity and electrical conductivity of trihedral methyne are poor. Because it is an organic compound, it has no free-moving electrons or ions inside, and it is difficult to conduct heat and electricity, so it is a poor conductor in terms of heat and electricity conduction.

In summary, the three-river methyne has the physical properties of gaseous state, lower density than air, insoluble in water, low melting point, poor thermal and electrical conductivity.

α,α,α - the chemical properties of m-trifluorocresol

"Tiangong Kaiwu" is a masterpiece of ancient Chinese science and technology, detailing the manufacture and process of all things. Today, it talks about the chemical properties of α，α，α - -triane-acetyl, and it is described in ancient Chinese.

α，α，α - This triane-acetyl has active chemistry. In its molecular structure, it exhibits unique properties due to the arrangement and bonding of specific atoms. In the stage of chemical reactions, it often shows a tendency to be nucleophilic or electrophilic.

Looking at its nucleophilic nature, because an atom in the molecule is rich in electron clouds, such as an atom with a lone pair of electrons, when it encounters an electrophilic reagent, it is like dry wood when it encounters a fire, and it reacts quickly. When the reagent approaches, the electron cloud is easy to shift and form a new chemical bond, which is the basis for nucleophilic addition or substitution.

In terms of its electrophilicity, a certain area of the molecule is partially positively charged due to the low density of the electron cloud, which is like the opposite pole of a magnet, attracting electron-rich groups. In case of a reagent containing lone pairs of electrons, the two attract and merge to form a new structure.

In addition, ，α，α，α - intertrane acetyl has considerable thermal stability. If it is at a moderate temperature, its structure can be stable, but if it exceeds a certain threshold, the chemical bond such as fragile strings may break, triggering decomposition reactions, and the products are complex and diverse, depending on specific conditions. < Br >
In the acid-base environment, its performance is also different. In the case of acid, the distribution of electron clouds can be changed due to protonation, and the reactivity can be changed; in the case of alkali, it may cause deproton reactions, all due to the disturbance of acid-base on the charge distribution within the molecule.

In short ，α，α，α - the chemical properties of intertriane acetyl are flexible and changeable due to its structure. In various chemical reactions, such as the changing spirit, it shows the wonder of the chemical world.

α,α,α - precautions in the preparation of m-cresol

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First, the careful selection of raw materials is crucial. To prepare acetylene, calcium carbide and water are commonly used. The purity of calcium carbide affects the quality and amount of acetylene produced. If calcium carbide contains too many impurities, the impurities interact with water, or other gases are produced, resulting in impure acetylene, which is hindered by subsequent application. Therefore, when choosing calcium carbide, the purity should be high to maintain the purity of acetylene.

Second, the rate of reaction must also be well regulated. The reaction between calcium carbide and water is violent and the rate is difficult to control. If the reaction is too fast, a large amount of heat and gas will be released in an instant, or the internal pressure of the device will rise sharply, causing danger. Water can be slowly added by means of a liquid separation funnel to control the reaction rate and make the reaction proceed smoothly. In this way, it not only ensures safety, but also facilitates the stable production of acetylene.

Third, the tightness of the device cannot be ignored. Acetylene is a flammable gas. If the device leaks, acetylene escapes, and it encounters an open flame or hot topic, which is easy to cause an explosion. Therefore, before preparation, when carefully checking the airtightness of the device. You can immerse one end of the catheter in water and hold the outer wall of the reactor with both hands. If there are bubbles emerging at the mouth of the catheter, after loosening the hand, a water column will be formed in the catheter to prove that the device does not leak.

Fourth, the collection and purification of gas is also key. Acetylene is insoluble in water and can be collected by drainage method to obtain pure acetylene. However, due to the impurities in calcium carbide, the acetylene produced by the reaction often contains impurities such as hydrogen sulfide and phosphine, which are odorous and toxic, and need to be purified and removed. The gas can be washed with copper sulfate solution, and the reaction of hydrogen sulfide with it produces copper sulfide precipitation, and the reaction of phosphine with it generates copper phosphate precipitation, so as to achieve the purpose of purification.

Preparation of inter-abyss acetylene requires careful work in terms of raw materials, reaction rate, device airtightness, and gas collection and purification to obtain pure acetylene, and to ensure the safety of the preparation process.

α,α,α - market prospects of m-trifluorocresol

Looking at the prospects of the market today, in α, α, α, that is, Jiayi between the three rivers, the image is quite impressive.

This place is the key point of water and land, the intersection of the three rivers, the boats and boats are woven, and the goods are swallowed endlessly. Merchants from all over the world admire the convenience of its location, and they come one after another, and the wind of trade is prosperous. There are all kinds of industries in the city, row after row, all kinds of silk and satin, shops of pearl and jade treasures, and stacks of rice and noodles grain and oil. And the people are prosperous, the people are prosperous, and their consumption power is quite strong. They all provide a vast market for all kinds of business.

Furthermore, the industry of Jiayi is also booming. The business of farming and mulberry is meticulous cultivation, and the grain and cotton produced are not only self-sufficient, but also exported to other parties. In the workshop, the craftsmanship is exquisite, the utensils made are of high quality, and the reputation is far-reaching. In recent years, there have been more emerging industries, such as merchant joint ventures, commodity brokers, etc., which have also sprung up like mushrooms after a rain, adding new force to the market and making it full of vitality.

Of course, there are also some hidden worries. The competition between the four sides is becoming more and more intense, and the neighbors are also struggling to develop, or there is a worry of taking profits. And the rules of the market still need to be complete. From time to time, profiteers are bullying the market and using shoddy practices to disturb the order of the market. However, overall ，α、α、α， that is, Jiayi between the three rivers, the prospect of the market, although there are waves, then the general trend is good, if we can do a good job, rectify and standardize, we will be able to grow increasingly prosperous, in the way of business, more accessible.