8-Quinolinesulfonic Acid

8 - Square lead is a sulfide ($PbS $) compound, and its chemical properties are special.
In terms of its chemical quality, the square is determined in the presence of normal and oxidation. However, in case of oxidation, such as nitric acid, it will react biochemically. Nitric acid is oxidizing and can be oxidized by sulfur. The inverse is roughly as follows: $PbS + 8HNO_ {3} () = Pb (NO_ {3}) _ {2} + S? + 6NO_ {2} ↑ + 4H_ {2} O $. In this inverse, the sulfur element is oxidized by -2% to generate sulfur, and the nitrogen element in nitric acid is oxidized by + 5% to + 4% to generate nitrogen dioxide.
In the acidic environment, there are also different expressions. In the acidic environment, its qualitative quality is high, and it is negative. In an acidic environment, if the oxidizability of the acid is not low, such as dilute acid, the square will react slowly and generate sulfide. The inverse formula is: $PbS + 2HCl = PbCl_ {2} + H_ {2} S ↑ $.
Furthermore, the square has a certain degree of originality. In the presence of high temperature and specific oxidation, the sulfur element can be oxidized, and the sulfide element can be formed into gold. For example, in an aerobic and high temperature smelting process, $2PbS + 3O_ {2}\ stackrel {high temperature }{=\!=\!=} 2PbO + 2SO_ {2} $, this step generates oxidation, and oxidation can be obtained in another step.
In other words, the chemical properties of the formula are affected by multiple factors such as oxidation, acid environment and temperature, and show different chemical properties under different conditions.

Bawei Qiang Huosan has various main uses. This medicine has the ability to relieve the surface and dissipate cold, remove wind and dampness, and is mostly used for the syndrome of exogenous wind cold and dampness.
If a person externally feels wind cold, and also contains dampness evil, the symptoms see cold and fever, no sweat on the surface of the muscle, strong headache, sore and painful limbs, bitter mouth and slightly thirsty, Bawei Qiang Huosan can be a good prescription. Gain in the prescription Qiang Huosan is hard and warm, dissipates the surface cold, removes rheumatism, and benefits joints. It is a medicine for the king. It can go straight into the meridian of the sun and disperse the wind cold and dampness on the surface. Windproof and sweet and warm, it is a moisturizing agent in wind medicine, expels wind and dehumidification, and Atractylodes is hard and warm, Gong is good for dryness and dampness and strengthens the spleen, helps Qiang Huo to remove the cold and dampness on the surface, and is also a subject medicine. Asarum, Baizhi, and Chuanxiong have three flavors, all of which can dispel wind and dissipate cold. Asarum is good at stopping headaches in Shaoyin meridians, Baizhi is good at solving headaches in Yangming meridians, and Chuanxiong is good at stopping headaches in Shaoyang and Jueyin meridians. These three medicines help you and your subjects to enhance the power of relieving the surface, and stop all kinds of pain. They are all adjuvants. Shengdi and Scutellaria clear away heat to prevent the products of warm and dryness and injury, and are also adjuvants. Licorice blends various medicines to make medicine.
This medicine is used in combination with other medicines to relieve the cold from the surface, remove the wind and dehumidify, so that the evil of wind cold and dampness can be solved from the surface, the qi and blood are smooth, and the diseases are self-eliminated. When the syndrome is present, if the syndrome can be distinguished and used properly, it can be effective to relieve the suffering of the patient.

The preparation method of 8-square anisolic acid is made by using anisaldehyde as the starting material and reacting in multiple steps. The detailed method is as follows:
First, anisaldehyde is heated with acetic anhydride and sodium acetate to perform Perkin reaction. In this step, the aldehyde group of anisaldehyde and acetic anhydride under the catalysis of sodium acetate undergo a condensation reaction to obtain cinnamic acid derivatives. This reaction condition requires strict temperature control, about 150-170 ° C, for several hours to ensure sufficient reaction.
The second product is obtained, and the oxidation reaction is continued. With a suitable oxidizing agent, such as potassium permanganate or potassium dichromate, in a suitable acid-base environment, the double bond of the cinnamic acid derivative is oxidized and broken, and then carboxylated. This oxidation process has strict requirements on the pH, temperature and the amount of oxidant used in the reaction system. If potassium permanganate is used as the oxidant, it is often needed in an alkaline environment, and the temperature should be controlled at 60-80 ° C. Slowly add potassium permanganate solution dropwise to prevent overreaction.
Or there may be other ways to prepare it. For example, anisaldehyde is brominated to introduce bromine atoms into the benzene ring, and then through a series of substitution and oxidation steps, 8-square anisole is finally obtained. However, there are many steps in this way, and the reaction conditions are more finely controlled.
Preparation of 8-square anisole requires attention to purification and separation in each step of the reaction. After each step of the reaction, the product needs to be purified by suitable methods, such as distillation, extraction, recrystallization, etc., to remove impurities, improve the purity of the product, ensure the smooth subsequent reaction, and obtain high-purity 8-square anilic acid.

For those who display acid, many matters must be paid attention to during storage and transportation.
The most important thing is its corrosiveness. This acid has strong corrosive properties. When storing, it must be stored in a corrosion-resistant container, and it needs to be placed in a dry, cool and well-ventilated place. If the container is made of improper material, the acid leakage will not only damage the storage place, but also endanger the people and things around it. Therefore, when choosing a container, it is necessary to carefully consider its material, such as glass, specific plastics, etc., to ensure its sealing and corrosion resistance.
Second, temperature and humidity control. Eight-square light shows that acid is prone to chemical changes in high temperature or high humidity, which affects its quality and stability. High temperature may cause its volatilization to intensify, odor overflowing, and may cause safety risks; high humidity may dilute the acid and change its chemical properties. Therefore, it is advisable to set up a temperature and humidity adjustment device in the storage place to maintain a suitable environment.
When transporting, there are also many precautions. First, the packaging must be stable. Professional packaging materials should be used to properly wrap the container containing the acid to prevent it from colliding and dumping during transportation. Second, transportation personnel should have professional knowledge and skills, familiar with the characteristics of this acid and emergency response methods. If there is a leak during transportation, it must be handled quickly and properly to prevent the harm from expanding.
Furthermore, the logo cannot be ignored. Whether it is the storage place or the transportation equipment, it should be clearly marked with "Ba-square light acid" and related warning labels, such as corrosive labels, dangerous chemical labels, etc., so that everyone can understand its danger and treat it with caution. In this way, when storing and transporting Ba-square light acid, it can be safe and safe, and disasters can be avoided.

In today's market, the price of 8-calciferous acid often varies according to the quality and the supply and demand of the market. The superior is pure and clean, free from impurities and filth, and the price will be high; the inferior is impurities and defects, and the price will be low.
In addition, the supply and demand of the city is also the main factor. If there are many people in need, but there are few suppliers, the price will rise; if the supply exceeds the demand, the price will drop.
In recent times, according to various market conditions, the price of 8-calciferous acid per catty may be between tens of dollars and hundreds of dollars. However, this is only an approximate number, not a definite value. When merchants buy and sell, the price is often different due to the volume of goods, the place of transaction, and the time.
In the prosperous capital of Dayi, where the commercial ports converge, due to the convenience of transportation, the spirit of information, and the large number of users, the price may be slightly flat and stable; in remote places, traffic is blocked, the number of supply and demand is difficult to equalize, and the price may fluctuate greatly.
In addition, the distance of the source also affects the level of the price involved. If the source is close, the freight will be saved, and the price may be low; if the source is far away, the freight will increase, and the price will also rise accordingly. In order to know the price of 8-calciferous acid, you must visit the city in person, consult the merchants, and observe the current supply and demand, and you can get it.