5,6-Dichloropyridine-3-boronic acid

The main uses of 5% 2C6 - vanadium dioxide - 3 - boronic acid are as follows:
###vanadium dioxide
Vanadium dioxide has unique uses in many fields. In terms of smart window materials, it has temperature-sensitive phase transition properties. When the ambient temperature is lower than a certain value, it appears as a semiconductor state, with a high transmittance to near-infrared light, which can obtain sufficient heat indoors; when the temperature is higher than this value, it changes to a metallic state, which enhances the reflection of near-infrared light and effectively blocks the introduction of external heat into the room, so as to achieve the purpose of intelligently regulating indoor temperature and reducing building energy consumption.
In the field of sensors, with its significant electrical and optical properties changing with temperature, high-sensitivity temperature sensors, infrared detectors, etc. can be produced. When the external temperature changes, the electrical or optical parameters of vanadium dioxide change. After detecting this change, it can accurately sense physical quantities such as temperature, and is widely used in industrial monitoring, security monitoring, etc.
###Boric acid
Boric acid is widely used in the glass industry. Adding boric acid in the manufacture of special glasses such as heat-resistant glass and optical glass can reduce the melting point of the glass and improve the thermal stability, chemical stability and mechanical strength of the glass. Like the borosilicate glass commonly used in the laboratory, it has good heat resistance due to the addition of boric acid, and is not easy to break when the temperature changes.
In the field of medicine, boric acid has the effect of disinfection and preservative. Its dilute solution can be used as an ophthalmic lotion to clean and disinfect the eyes and relieve eye inflammation; it is also used in the disinfection of skin mucosa, which can inhibit bacterial growth and prevent wound infection.
In agriculture, boric acid is an important trace element fertilizer. Appropriate application of boric acid can promote the development of plant roots, pollen germination and pollen tube elongation, and improve the seed setting rate and fruit setting rate of crops. It is of great significance to the growth and development of crops such as rapeseed and cotton. It can effectively prevent various physiological diseases caused by boron deficiency in crops and improve the yield and quality of agricultural products.

To make phosphorus pentoxide and boric acid, there are many methods, each of which is ingenious.
To make phosphorus pentoxide, white phosphorus can be burned stably in sufficient air or oxygen. As "Tiangong Kaiwu" said, the material reaction needs to be in a suitable environment. When white phosphorus burns, the flame is bright, and the smoke generated is phosphorus pentoxide. This process needs to pay attention to safety. White phosphorus is highly toxic and flammable. When operating in a well-ventilated and well-protected place. Phosphoric acid dehydration can also be used. A strong dehydrating agent such as concentrated sulfuric acid is co-heated with phosphoric acid, and phosphoric acid loses water to obtain phosphorus pentoxide. However, this operation requires precise temperature control to prevent overreaction.
As for the preparation of boric acid, one of the reasons is that borax can be moderately reacted with sul When borax encounters sulfuric acid, ions are exchanged to form boric acid. This reaction is like a harmony of yin and yang, and the product is pure if the ratio is appropriate. Second, you can start with boron-magnesium ore. Boron-magnesium ore is treated with sulfuric acid, and then boric acid can be obtained by a series of separation and purification methods. This process is complicated, but the key step by step is related to the quality of the product.
All these production methods need to be selected according to the actual situation, the amount of materials, and the quality of equipment. When operating, the procedures should be strictly followed to achieve the purpose of efficient and safe preparation.

At present, the price of vanadium pentoxide in the city varies according to the quality, supply and demand conditions.
Looking at the city in recent years, the price of vanadium pentoxide fluctuates frequently. In the past, due to the prosperity of the industry, the demand was strong, and its price was high. If the supply is sufficient and the demand is weak, the price will drop.
As for the present, the price of vanadium pentoxide in the city is about hundreds and tens of yuan per kilogram. Second, the price may drop. Its price often varies due to mineral abundance, clumsy craftsmanship, policy guidance and control, and global market trends.
The price of sulfuric acid also moves with the city. Sulfuric acid is used in chemical industry, smelting and mining. The price is related to the cost of sulfur source, energy consumption, and transportation. Usually, the price of industrial-grade sulfuric acid per ton may be between a few hundred yuan. If the price of sulfur rises, or demand is strong, the price will also rise; if the supply exceeds the demand, the price will fall.
The prices of these two things are all determined by market conditions, political conditions, and business conditions. If you want to clarify their exact prices, you should observe the real market conditions and cannot generalize.

The physical and chemical properties of 5% 2C6 - nitrogen dioxide - 3 - nitric acid are as follows:
###Nitrogen dioxide
Nitrogen dioxide, red-brown in color and pungent in smell, is toxic. Under standard conditions, the density is greater than that of air. And it is easily soluble in water, but interacts with water, not simply dissolved, but chemically changed. Its reaction with water is:\ (3NO_ {2} + H_ {2} O = 2HNO_ {3} + NO\). In this reaction, nitrogen dioxide is used as both an oxidizing agent and a reducing agent. In the atmosphere, it can participate in the formation of photochemical smog, endangering the environment and human health.
###Properties of Nitric Acid
Nitric acid is one of the strong acids and is highly corrosive. Pure nitric acid is a colorless and volatile liquid, and white mist can be seen when opened. This is due to the volatilization of nitric acid and the combination of water vapor in the air. The boiling point of nitric acid is low, and it is easy to decompose under heat or light. The decomposition reaction formula is:\ (4HNO_ {3}\ xlongequal [] {light or heating} 4NO_ {2}\ uparrow + O_ {2}\ uparrow + 2H_ {2} O\). The nitrogen dioxide produced by decomposition dissolves into nitric acid, causing nitric acid to often appear yellow.
Nitric acid is strongly oxidizing and reacts with metals, which is very different from dilute sulfuric acid and hydrochloric acid. Except for a few metals such as gold and platinum, most metals can react with nitric acid. And during the reaction, the valence state of nitrogen in nitric acid decreases, and different reduction products are formed according to the concentration of nitric acid and the reactivity of metals, such as\ (NO_ {2}\),\ (NO\),\ (N_ {2} O\),\ (N_ {2}\) and even\ (NH_ {4 }^{+}\) . For example, copper reacts with concentrated nitric acid:\ (Cu + 4HNO_ {3} (concentrated) = Cu (NO_ {3}) _ {2} + 2NO_ {2}\ uparrow + 2H_ {2} O\); copper reacts with dilute nitric acid:\ (3Cu + 8HNO_ {3} (dilute) = 3Cu (NO_ {3}) _ {2} + 2NO\ uparrow + 4H_ {2} O\). Nitric acid can also undergo redox reactions with many non-metallic elements, such as carbon reacts with concentrated nitric acid:\ (C + 4HNO_ {3} (concentrated) \ xlongequal [] {heated} CO_ {2}\ uparrow + 4NO_ {2}\ uparrow + 2H_ {2} O\).

For vanadium pentoxide, all precautions are essential during storage and transportation.
As far as storage is concerned, it should be placed in a cool and ventilated warehouse. Because of its toxicity and oxidation, it needs to be stored separately from flammable, combustible, reducing agents, etc., and must not be mixed. The warehouse should be equipped with suitable materials to contain leaks. If the storage environment is improper, it may react with other substances, causing danger, such as mixing with reducing agents, or can cause severe redox reactions, heat generation or even explosion.
As for transportation, caution is also required. Before transportation, ensure that the packaging is complete and the loading is secure. During transportation, ensure that the container does not leak, collapse, fall, or damage. It is strictly forbidden to mix and transport with flammable or combustible substances, reducing agents, edible chemicals, etc. During transportation, the transportation vehicle should be equipped with leakage emergency treatment equipment. Summer transportation should be carried out in the morning and evening to avoid sunlight exposure, in case the temperature rises and causes its properties to change and cause danger. If the package is damaged during transportation and causes leakage, improper handling or pollution of the environment will endanger the safety of humans and animals.
Therefore, in the storage and transportation of vanadium pentoxide, every step must be strictly followed to ensure safety and prevent problems before they occur.