3-Bromothiophene-2-sulfonyl chloride

The main use of 3% green material and 2% green material is not fully refined in the chemical industry of "Tiangong", but it can still be used to make ancient tools and prevent the concept.
Green material, ancient "green paint", its stickiness and waterproof, the ancient ancestors mostly used it for boat repair. Boats are often invaded by water, so they can be watertight and leak-proof, and protect the stability of boats. For example, in the production of boats like "Tiangong", it is often mentioned that the hull of the boat is covered with a blue-like thing, so that water can enter. This is its waterproof ability. And the green is hidden in the ground for a long time without rot. The ancients also used it for the waterproofing of the hidden utensils, such as the pottery urn where wine is hidden.
2% of the raw material, with the ancient corner, both gold and gold are used. The concept involved in the material is close to the prevention of gold. In the name of "raw materials" in "Tiangong", the method of preventing gold is described. A dense oxide film can be formed in the air. The ancients did not know the principle of its transformation, so they used a similar method to protect gold utensils. For example, the manufacture of tools and utensils can prevent their raw and rotten, and materials containing gold particles are often used. 2% stainless steel material, if used in gold parts, can be borrowed from the characteristics of stainless steel and stainless steel to resist the connection of oxygen and stainless steel, and the effect of anti-corrosion. And it has good reflectivity. If it is used in utensils that need to be prevented, it can reflect natural light, absorb less energy, and also have a certain protective effect. This may be an extension of the concept of ancient golden utensils and protective objects.

Oxidation, that is, oxidation, is one of the most important, and is used in work and life. Its physical properties are as follows:
- ****: Under normal conditions, it is white solid, and there are polymorphisms such as oil, film, grain or rod. It is brittle and easy to pulverize, and the outer surface is hard.
- ** Solubility **: It is easily soluble in water, and the dissolved water releases a large amount of water. With water solubility, the water can be rapidly dispersed to form a uniform solution. And its solubility increases with increasing solubility, and it can dissolve more water in boiling water.
- ** Deliquescence **: It is highly deliquescent. Placed in the air, it will quickly absorb water, and the surface will get damp one by one, as if there is liquid material coming out. Due to its deliquescence characteristics, the storage tank needs to be sealed to prevent it from absorbing moisture in the air tank and deliquescence.
- ** Absorption **: In addition to absorbing moisture in the air tank, the steam tank also has strong adsorption capacity. Even if the air phase is dry, it will also absorb water vapor in the surrounding environment to bring it to its own hydration.
- ** Density **: The density phase is large, 2.130 g/cm ³. Compared with other conventional solids, the weight is heavier, and it feels heavy in the hand. < Br > - ** Melting boiling temperature: Melting temperature is high, > 318.4 ° C. Under normal temperature conditions, the solid shape is maintained. To melt it, a sufficient amount needs to be provided. Boiling temperature is 1390 ° C, and a high temperature is required to vaporize it.

To make tri-nitroglycerin, the ancient method is fresh, but now there are all kinds of wonderful methods.
First, the method of co-reaction of glycerol with concentrated nitric acid and concentrated sulfuric acid. Glycerol is slowly poured into the mixed cold concentrated nitric acid and concentrated sulfuric acid. This process requires caution, because the reaction is violent and highly dangerous. When mixing, it is necessary to constantly stir to dissipate heat evenly and prevent local overheating from causing accidents. After the reaction, the product is stratified, washed with water, alkali washed and other processes to remove impurities to obtain a purer tri-nitroglycerin.
Second, catalytic nitrification method. This is achieved by means of a specific catalyst, which can make the reaction conditions mild and improve the reaction efficiency and selectivity. Commonly used catalysts, such as metal salts or some special organic compounds. Under the presence of suitable temperature, pressure and catalyst, glycerol and nitric acid are nitrified, and then separated and purified to obtain trinitroglycerin.
Third, the phase transfer catalysis method. This method uses a phase transfer catalyst to promote the rapid transfer of reactants between different phases and accelerate the reaction process. In the reaction system, the phase transfer catalyst can effectively reduce the interfacial tension, so that the immiscible reactants are fully contacted to achieve an efficient nitrification reaction. Later, regular separation and refining methods are used to obtain pure trinitroglycerin. < Br >
Although there are various methods for making trinitroglycerin, it must be operated with caution, because it is highly explosive, related to safety, and must not be sloppy at all. Each method has its own advantages and disadvantages. In practical application, the most suitable method should be selected according to the specific situation to achieve the best preparation effect.

Mercury is very important for storage and storage, and it is very important to pay attention to all kinds of things. Both of them are toxic. If you don't pay attention, it will be raw.
Mercury, the liquid gold is also sexually active, and it is easy to be evaporated into mercury. This vapor is toxic, and inhalation is harmful to mental, digestive, urinary and other systems. It is necessary to keep the container in a safe place to prevent the loss of mercury. And it needs to be placed in a well-connected place, where the fire source and the source are exposed. If the temperature increases, the mercury will be accelerated. It is hard to be solid and resistant to collision to prevent it from breaking and exposing. If it is unfortunate to leak, it will be quickly isolated and evacuated. Do not directly contact the container by hand, and collect it with tools. The sulfur powder will be leaked in the container, so that it can be synthesized into mercury sulfide to reduce toxicity.

The same is toxic. The amount of food or skin contact can cause poisoning, which affects the spiritual, hematopoietic, digestive and other systems. It is advisable to use a sealed container to prevent it from deliquescence and destruction, and to separate food, materials, etc. to avoid pollution. The storage place should also be dry and clear, and protected from direct light. On the way, the package should be kept intact to avoid the mixing of acid, sulfur and other substances, because it may cause chemical reactions, resulting in leakage.
Therefore, mercury should be stored and stored, the sealing of the container, the leakage of the environment, and even the leakage of the environment, all of which need to be paid attention to, and must not be slack in order to ensure human safety and avoid environmental pollution.

There is a question today, what is the market price range of three-colored glaze. Those who cover three-colored glaze are treasures of ancient times, and their prices vary greatly depending on the appearance, age, and craftsmanship.
If the quality is high, and it comes from a famous kiln, those who are old, the price is high and unpredictable. In the prosperous age of ancient times, the exquisite three-colored glaze used by the court was worth thousands of dollars, or even immeasurable. At that time, the craftsmen were exquisite in their skills, and the color and texture of the glaze were magnificent, and the texture was crystal clear. They were vested by officials and dignitaries, and their price was so high that it was beyond the reach of ordinary people.
However, if the quality is slightly inferior, the craftsmanship is not exquisite, and if the age is recent, the price is slightly inferior. Or in the market, it can be worth tens of gold to hundreds of gold. Although this kind of glazed glass does not have the beauty of the top level, it also has considerable advantages and is favored by ordinary collectors or ancient people.
There are also imitation three-color glazed glass, which is cheaper, or only worth a few gold. Most of these are imitations by today's craftsmen. Although the shape is similar, it is difficult to match the charm of antiquities.
In short, the market price of three-color glazed glass ranges from a few gold to more than ten thousand gold, and the span is very large. It is due to many factors. Buyers should carefully distinguish the authenticity and carefully inspect the appearance before they can know its true value.