The halogen sand, also known as jiao sand, has a wide range of uses. In the way of medicine, halogen sand has the ability to break blood stasis and eliminate accumulation, soften and strengthen corrosion. The Compendium of Materia Medica says: "Halogen sand is a toxic thing in great heat. It can be taken by people who are addicted to choking diaphragms and accumulating lumps. It can be used to break the accumulation." Therefore, for the treatment of certain diseases, halogen sand can be used as a medicine to help the medicinal effect and break up the stasis in the body.
In alchemy, halogen sand is also a commonly used thing. In ancient times, alchemists believed in the special properties of halogen sand, which can interact with various gold and stone medicinal materials during the process of alchemy to promote the refining of medicinal pills. It may be able to adjust the effect of heat, or in the formation of alchemy, medicinal fusion, etc., all have subtle uses. Because of the art of alchemy, the pursuit of the essence of gold and stone condensation, the nature of brine sand, or the quality of gold and stone can be integrated with each other to achieve the magical medicinal effect required for alchemy.
In the field of process production, brine sand also has its unique use. For example, in some metal processing techniques, brine sand can be used as a flux. It can reduce the melting point of metal, making it easier for metal to melt and shape. This property, in ancient metal casting processes, may help craftsmen to create more exquisite and complex instruments. And brine sand or the treatment of metal surfaces is also helpful, which can make the surface of metal products smoother and smoother, and improve their quality and aesthetics.
Furthermore, in the dyeing industry, brine sand may participate in the preparation of some dyes. It may affect the color fastness and color presentation of dyes. Ancient dyeing workshop craftsmen, after long-term practice, or to explore the appropriate dosage and usage of brine sand in the dyeing process, in order to make the color of the fabric more vivid and lasting, to meet the world's pursuit of beautiful fabrics.

Mercury sand, its physical characteristics can be studied. Mercury, a vulgar water, is the only gold that is liquid under normal conditions, and its appearance is like beads flowing, shining. Its density is very high, 13.59 g/cm3, so it is often mixed with other things. And the boiling temperature of mercury is low, 356.73 ° C, a little easier to steam, Diffuse in the air, this vapor is stinky and toxic.
, the color is blue and gray, Ground, has good ductility. Its density is also high, 11.34 g/cm3, among the heavy list of gold. The melting price is not high, 327.46 ℃ will melt. It is resistant to corrosion, and when exposed to air, a film of carbonate will form on the surface.
As for sand, its main component is silica, which is often found on the banks of mountains, rivers and seas. The shape of the sand grains is different, or the shape is different, or the angle is clear, and the size is also different. Its hard ground, Mohs hardness is 7, high resistance, and the chemical properties are determined, and it is not easy to generalize the chemical and biochemical reactions of the materials.
Mercury is a three-party sand, mercury is known for its special liquid and easy toxicity; it is known for its weight, quality and corrosion resistance; sand is important for its hardness and chemical properties. The material nature of these three things, in the world of creation, each has its own unique characteristics, and has its own uses in many aspects such as engineering, engineering, and smelting.

For methane, the performance is as follows:
First, it is flammable. In case of open flame and high temperature, it will ignite immediately, and it will produce a light-colored flame. The reverse formula is: $CH_ {4} + 2O_ {2}\ stackrel {}{=\!=\!=} CO_ {2} + 2H_ {2} O $. A large amount of fuel is burned, and it is commonly used as fuel for heating, heating, etc.
Second, energy generation replaces anti-combustion. Under light conditions, it can be used as fuel (such as chlorine). $Cl_ {2} $). Taking chloroform as an example, monochloromethane is first generated. The trans-formula: $CH_ {4} + Cl_ {2}\ stackrel {light }{=\!=\!=} CH_ {3} Cl + HCl $; chloroform can be trans-chloroform, and in sequence, dichloromethane ($CH_ {2} Cl_ {2} $), trichloromethane (vulgar chloroform, $CHCl_ {3} $) and even carbon tetrachloride ($CCl_ {4} $).
Third, it can be decomposed at high temperature. The trans-formula: $CH_ {4}\ stackrel {high }{=\!=\! =} C + 2H_ {2} $, this inverse can be used to produce carbon black and carbon black.
Fourth, under specific catalysts and components, it can be reformed. Such as methane water steaming reforming, inverse formula: $CH_ {4} + H_ {2} O\ stackrel {catalytic }{=\!=\!=} CO + 3H_ {2} $, the generated carbon monoxide and carbon monoxide can be used for synthesis of methanol and other chemical products.

The generalization of methane makes it an important position in the chemical industry, energy and other fields, with a wide range of uses, promoting the development of engineering and the convenience of life.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty. It is related to various processes and technologies. Today, it is Junyan's method of manufacturing haloalkanes.
For haloalkanes, the hydrogen atom in the hydrocarbon molecule is a compound formed by the substitution of halogen atoms. There are three preparation methods.
First, it is prepared from hydrocarbons. Alkane halogenation, this is the reaction between alkanes and halogens under light or high temperature. For example, when methane and chlorine are irradiated, chlorine atoms replace the hydrogen atoms of methane to give haloalkanes such as chloromethane, dichloromethane, trichloromethane and carbon tetrachloride. The mechanism of this reaction is free radical substitution. Light or high temperature makes halogen molecules split into free radicals, which then triggers the reaction. However, the products obtained by this method are often < Br >
Second, prepared from alcohols. Alcohol and hydrohalic acid can react to produce haloalkanes. Taking ethanol and hydrobromic acid as an example, under the catalysis of sulfuric acid, the hydroxyl group of ethanol is replaced by bromine atoms to form bromoethane and water. This reaction process varies depending on the structure of alcohols. Primary alcohols generally follow the SN2 mechanism, and secondary alcohols and tertiary alcohols mostly follow the SN1 mechanism. The raw material alcohol in this way is easy to obtain, the reaction conditions are mild, and it is widely used.
Third, halogen atom exchange method. Halogen atoms in haloalkanes can be replaced by other halogen atoms. For example, chloroalkane reacts with sodium iodide in acetone solution, and chlorine atoms are replaced by iodine atoms to obtain iodine and sodium chloride precipitation. This method is often used to prepare iodine alkanes, because it is difficult to synthesize iodine alkanes directly, and this method is simple and easy to implement, and sodium chloride precipitation is easy to separate, which is conducive to the forward reaction.
The above are common manufacturing methods for haloalkanes, each with its own length. The actual application is selected according to comprehensive considerations such as demand, raw materials and reaction conditions.

In the process of storage and storage of acetylene, all kinds of things should be done with caution. The first thing to do is to reduce the environment of the room. The room should be dry and well-connected, and the source of fire, heat and oxidation should be good. If the room is wet, it is easy to cause the corrosion of the acetylene container; if the pass is not good, it will be tired, and in case of open flame or high temperature, it will be feared to explode. And other chemical products should be stored separately to avoid danger due to interaction.
The use of the container should not be ignored. A suitable and qualified container must be used, and its material can withstand the resistance of acetylene. Check the container regularly. If there is any damage or leakage, it will be a new device. If there is a small amount of leakage, it will be much less. If it burns, the result will be unimaginable.
In the process of transportation, it is necessary to comply with the relevant safety standards. Equipped with perfect fire-fighting equipment and emergency management of leakage, so as not to be needed. The company is well-versed in the dangerous characteristics of acetylene and emergency treatment methods. During transportation, it is necessary to prevent bumps and collisions, which may cause the container to break due to strong shocks. And the road is well-protected from sensitive areas such as densely populated areas, schools, hospitals, etc., to reduce the harm of accidental safety.

During the unloading process, the operation must be strict, and it is forbidden to drop, drop, and hit the container. Workers need to take precautions, such as gas masks, anti-rubber gloves, etc., to prevent the container from connecting to the body. After unloading, check whether the container seal is well sealed to avoid leakage during transportation. In addition, every aspect of the storage of acetylene is very important, and if there is a little carelessness, it will be huge. Therefore, those who work hard must be safe and follow all procedures.