1-% mercury, toxic substances are also mostly stored in mines. In the past, it was used for alchemy, but it was strong in nature. If people accidentally contact or inhale it, it often causes serious illness and damages the viscera, so it is rarely used for common things.
2-3-Dialum, that is, green alum and alum. Green alum, green in color, can be used in dyeing workshops to help dye, and is also occasionally used in medicine by doctors to treat blood diseases. Alum, white in color, can make turbidity settle when purifying water, and can also be used to process drugs to remove its toxicity or increase its effectiveness. It is also used in folk pickled food to prevent spoilage.
4-methoxybenzene has a wide range of uses in this world, but it did not have this title in ancient times. If it is a similar thing, it is slightly related to the preparation of ancient fragrances and the production of some special medicines. In fragrances, it may increase the flavor of its fragrance, making it more fragrant and long-lasting; in medicines, or to reconcile various medicines, to make the medicinal properties more peaceful, or to help it exert specific curative effects.
Although the uses used in ancient times may be different from those used in the present, they all vary according to the cognition and needs of people at different times. Ancient people based on their limited knowledge, explored the nature of things, used them in life, medicine, craftsmanship and other affairs, and accumulated a lot of experience for future generations. Later generations will continue to build on the foundation of their predecessors, conduct more in-depth research, expand the uses of various things, and make them increasingly extensive and serve the world.

1. ** Method of smelting mercury **: Mercury, commonly known as mercury, is liquid at room temperature and silver-white in color. To obtain mercury, it is often refined in Dan sand. For Dan sand, mercury sulfide is also. First crush Dan sand as the end, put it in a closed vessel, and calcine it with fire. Dan sand is decomposed by heat, sulfur and oxygen are synthesized into sulfur dioxide to escape, and mercury is turned into steam, which is re-condensed into a liquid state when cooled and gathered at the bottom of the vessel. This is the common method of smelting mercury in ancient times.
2. ** Method of smelting zinc **: The smelting of zinc was also a technique in ancient times. Zinc ore is often accompanied by other mines, such as calamine, which mainly contains zinc carbonate. Calamine and charcoal are placed in a special furnace. First, the furnace is heated to decompose calamine into zinc oxide, followed by high temperature, the carbon of charcoal reacts with zinc oxide, the carbon takes oxygen from the carbon to carbon dioxide, and the zinc is then reduced to steam and rises. When condensed in a special device, zinc can be obtained.
3. ** Method of smelting lead **: Lead ore is common, and there is galena, the main component of which is lead sulfide. When smelting lead, galena is first roasted, so that lead sulfide reacts with oxygen to form lead oxide and sulfur dioxide. Later, charcoal and lead oxide are co-heated, and the carbon of charcoal takes oxygen from lead oxide, and lead is reduced. There are also those who use galena and iron to co-heat, iron is more active than lead, and can replace lead in lead ore.
4. Synthesis of Acetylaniline: To synthesize acetylaniline, aniline can be co-heated with glacial acetic acid. Using an appropriate amount of zinc powder as a catalyst, mix aniline and glacial acetic acid in a round bottom flask, install a reflux condenser, and heat on low heat. During the reaction, the amino group of aniline and the carboxyl group of glacial acetic acid are dehydrated and condensed to form acetylaniline. After the reaction is completed, the product is cooled, and crystals are precipitated. Pure acetylaniline can be obtained by suction filtration, washing, and recrystallization.

1-% E6% BA% B4, the water is clear, its sex is supple, flowing and endless, moisturizing all things and silent. It always exists between rivers, lakes and seas, and is the source of life for all things. Its quality is pure, colorless and odorless, it is clear when viewed, cool when touched, and sweet when drunk. It can relieve people's thirst and nourish their internal organs.
2-%E4%BA%8C%E6%B0%9F, that is, the two waters meet, and the flow trend may be slow or rapid, depending on the topography. Slow time is like a mirror, reflecting the shadow of all things; when it is urgent, it is like a flood, with the potential of overwhelming mountains and seas. Its water is powerful, can carry boats and boats, and can also generate energy. It is used by the world, and it is not very useful.
3-%E7%94%B2%E6%B0%A7%E5%9F%BA%E8%8B%AF, this substance also has many physical properties. Its shape can be seen as a solid crystal or a liquid oil. When it is solid, it is hard and brittle, crystal clear and shiny. When heated, it melts into a liquid state and flows freely. Its density is lighter than that of water, so it floats on water.
Furthermore, it is insoluble in water, but it melts with many organic solvents. When burned, the flame is bright and generates a lot of heat. It can be used as fuel, heating and lighting, and is widely used in humans. And it is volatile and can gradually dissipate in the air, giving it a special smell. Due to its unique physical properties, it is widely used in various fields such as chemical engineering and medicine, and is indispensable to the world.

1. ** 1 - Mercury **: Mercury is a highly toxic metal. It is liquid at room temperature and volatile. When storing, it should be packed in thick-walled glass bottles and sealed tightly to prevent mercury vapor from escaping, because it can cause serious poisoning when inhaled into the human body. During transportation, be sure to ensure that the container is stable to avoid collision damage and mercury leakage. In the event of leakage, the crowd should be evacuated quickly, ventilation should be strengthened, and sulfur powder should be covered, so that mercury can react with it to form mercury sulfide and reduce toxicity.
2. ** 2,3-diene **: This is an organic compound with a special structure and has high reactivity. When storing, it should be placed in a cool and well-ventilated place, away from fire sources and oxidants, because it is flammable and explosive. Storage containers should be made of corrosion-resistant and well-sealed materials to prevent leakage. When transporting, it is necessary to strictly abide by the regulations on the transportation of hazardous chemicals, equipped with corresponding fire and emergency equipment. Transportation vehicles need to have obvious warning signs. Transportation personnel should be professionally trained and familiar with emergency treatment methods.
3. ** 4 -Acetylaniline **: When storing, it should be stored in a dry and cool warehouse, away from fire and heat sources. Because it is flammable in case of open flames and hot topics. Packaging should be sealed to prevent moisture deterioration. There are also requirements for the humidity and temperature of the storage environment. Generally, the humidity should be lower than a specific value, and the temperature should be maintained in the normal temperature range. During transportation, ensure that the packaging is complete and the loading is safe, and avoid mixed transportation with oxidants, acids, etc., to prevent chemical reactions. At the same time, transportation vehicles should be equipped with rain and sun protection facilities to prevent products from being affected by environmental factors.

In today's world, what is the market situation of green, dienes, and formaldehyde-based benzene compounds? Let me tell you.
The use of green is too great. For roads, it is an indispensable thing. Its stickiness and durability can make the road solid and durable. The traffic in this world is complicated, and it is difficult to travel. The road needs to be green, and the road needs water. Therefore, the demand for green markets is often at a high level. The work of roads in various places is not good, and the amount of them is also increasing. However, its production is made of crude oil and other raw materials, and the waves of raw materials are often caused by the ups and downs of green.
Dienes are also an important part of the chemical industry. Raw materials for synthesizing rubber, grease and other multi-materials. The prosperity of industrial production, the daily use of rubber and plastic products, from the steam tire to the daily equipment, are all made of diene. Therefore, the market prospect of diene can be improved. However, its production is also the ability to protect the technology, and it is necessary to seek efficient and reliable production methods. People in the field often think hard and explore.
Formalaldehyde-based benzene is also used. It is widely involved in production, dyes and other industries. Research and development requires its raw materials to make, and dye production can be used to produce beautiful colors. However, because of its certain toxicity, its production and use are subject to strict regulations. The development of the market also needs to combine safety and efficiency. The demand is there, but the enterprise must follow the rules to ensure the safety of life and use, so as to seek the safety of the market.
Of course, this product is in the market, and each has its own feelings. Or it is due to demand, or it is due to the control. Only by improving the degree can it be used in the waves of the market, and it will be familiar with it. Seek development and prosperity.