6-BROMOPYRIDINE-2-FORMIC ACID

Acid, a wide variety of types, a wide range of uses. Take acetic acid as an example, its main use is quite important.
Acetic acid is a key raw material for organic synthesis in the chemical industry. Acetic acid is involved in the preparation of many important organic compounds. For example, the preparation of ethyl acetate is a common organic solvent and fragrance raw material. The reaction principle is that acetic acid and ethanol are catalyzed by concentrated sulfuric acid and heated under esterification conditions. Its text says: "Acetic acid and ethanol, using sulfuric acid as a medium, are heated together to obtain ethyl acetate and water." This reaction is widely used in flavors, coatings and other industries to add unique aroma and good solubility to products.
In the food industry, acetic acid is also indispensable. The main component of vinegar is acetic acid. Appropriate amounts of acetic acid give vinegar a unique sour taste, which can be used for seasoning, adding food flavor, and enhancing appetite. "Add vinegar to the food to increase the taste." And acetic acid has a certain antiseptic effect, which can inhibit the growth of some microorganisms, prolong the shelf life of food, and ensure food safety.
In the field of medicine, acetic acid also contributes. It can be used to prepare certain drugs, and can also act as a solvent or reaction medium in some drug synthesis reactions to help the drug synthesis process proceed smoothly.
Furthermore, in the textile printing and dyeing industry, acetic acid can adjust the pH of the dye solution, help the dye better adhere to the fabric, improve the dyeing effect, and make the fabric color more vivid and uniform. " When dyeing and weaving, the acid and alkali of the liquid are mixed with acetic acid, and the color is uniform and bright. "
In summary, acetic acid plays an important role in many industries such as chemical industry, food, medicine, textile printing and dyeing, and has a profound impact on human production and life.

Acid, its properties have various peculiarities.
First, it is corrosive. If a strong acidic liquid touches other things, it can often be eroded. The ancient alchemists used strong acid touchstone tools, and sometimes the utensils seemed to be eroded. Its erosive power is strong, like a sharp blade breaking bamboo, which can destroy the strength of gold and stone.
Second, it can combine with alkali. The ancient physicians occasionally used acid and alkali to dispense medicine, and when the two met, they changed, such as the upwelling of boiling soup, which turned into new things, and its properties also changed. This is the principle of the combination of yin and yang. Acid is yang, alkali is yin, and the two combine to achieve a neutral state.
Third, the sour taste is often sour. People eat fruits, and those who encounter acid often frown and smack their tongues. If the green plum is not ripe, its sour and pungent, the entrance will suddenly appear in the body, this is the sour taste. And the sour gas also has a unique taste. If you smell it, you often feel pungent, or it has a fresh sour aroma, but it has a pungent taste.
Fourth, it can change the color of the indicator. In the past, there was a special paper dyed in acid, and the color of the paper changed. This is the verification of the characteristics of acid. If you try it with litmus paper, it will be red when it encounters acid. This is a clear image, which is a convenient way to identify acid. < Br >
Fifth, there is a special phenomenon in the reaction of metals. When a metal encounters acid, or there is an effervescence of gas, this is the escape of hydrogen. If iron enters the acid solution, the iron gradually dissolves, and the gas comes out like a boil, this is the chemical reaction between the acid and the metal, and the iron turns into ions and dissolves into the liquid.
The physical properties of acids are obviously useful in daily life, medicine, alchemy, etc. The world should observe them carefully to understand their properties and make good use of them.

The method of making acid has been known in ancient times, and it depends on the accumulation of ingenuity and experience. There are three methods, each has its own strengths, let me come one by one.
First, use stone to make acid. Choose stones that are good for acid, such as pyrite, apatite, etc. Break them first, then calcine them. "Tiangong Kaiwu" says: "When the stone is calcined, the fire rises, and its quality gradually changes." When calcined, the fire is raging, and the acid in the stone is heated and condensed when cold, and acid can be obtained. This method requires controlling the heat. If the fire is large, the acid will dissipate, and if the fire is small, the stone is not ripe, and the acid will not be obtained.
Second, wood is used to make acid. Take acid-containing wood, such as bayberry wood, sour mold wood, etc. Cut the wood into slices and soak it in a water urn. After a while, the acid in the wood dissolves into the water to obtain acid. However, the types of wood are different, and the concentration of acid is also different. "Tiangong Kaiwu" says: "Each thing has its own nature, and its acid formation also varies from wood to wood." This method of acid production takes a long time, but it is better than easy access to materials and simple operation.
Third, acid is made from fruit. Pick sour fruits, such as green plums and lemons. Break the fruit and take the juice, which is acid. This juice is fresh and natural, and the sour taste is pure. But the maturity and origin of the fruit are different, and the sour taste is also different. " Tiangong Kaiwu says: "The acid of the fruit changes from time to time and varies from place to place." To make acid from fruit, it is better to choose fresh and ripe fruit in order to get good acid.
These three methods of making acid, although each has its own advantages, must be carried out according to the time, according to the material, and according to the law. If you make good use of them, you can use them for people's livelihood, or for seasoning, or for pharmaceuticals, or for other purposes, all of which can give full play to the wonders of acid.

When storing and transporting pickled acid, pay attention to the following things:
First, the storage vessel must be clean and sealed. Acid people like to be clean and filthy. If the vessel is unclean, the bacteria are easy to grow and cause acid to spoil. And sealing is necessary to prevent odor from invading, and to prevent excessive contact between air and acid to prevent its oxidation and deterioration. In the past, people often used pottery urns to store acid because of its warm nature, which can protect the quality of acid, and the pottery urn is slightly breathable, which can slowly age the acid and increase its flavor.
Second, the storage place should be cool and dry. Acid is afraid of heat and dampness, hot acid is perishable, and wet is prone to mildew. Therefore, the place of choice should be shaded when avoiding the sun and kept dry. If it is in a humid place, acid is easy to stain mold and lose its original taste. The ancient acid is mostly stored in the cellar. The place is cool and dry, and the acid can be stored for a long time without changing.
Third, when transporting, bumps and collisions should be prevented. Acid containers are mostly fragile pottery, porcelain, or plastics that are not resistant to impact. If there are severe bumps and frequent collisions during transportation, the container is easy to break, and the acid will leak. Therefore, when handling should be light, and the placement should be stable. You can add padding to the container, such as hay, soft cloth, etc., to absorb shock.
Fourth, temperature control is also the key. Pickled acid at a suitable temperature can maintain flavor and stable quality. If it is overheated, the fermentation will be too fast, causing a sour taste to be too heavy and perishable; if it is too cold, it may affect the fermentation process and change the taste. Generally speaking, an environment with a slightly lower room temperature is appropriate. Transportation and storage should pay attention to temperature changes.

The price of acetic acid in the market is not constant, but is determined by various factors.
First, the price of raw materials has a great impact on the market price of acetic acid. The preparation of acetic acid is often obtained by catalytic reaction of methanol and carbon monoxide as raw materials. If the price of methanol and carbon monoxide rises, the production cost will also increase, and then the price of acetic acid will also rise; conversely, if the price of raw materials falls, the price of acetic acid is expected to fall.
Second, the state of market supply and demand is also a key factor. If the market faces strong demand for acetic acid and limited supply, its price will rise; if the market is oversupplied and demand is weak, prices will inevitably decline. Therefore, changes in demand for acetic acid in various industries, such as plastics, chemical fibers, pharmaceuticals, etc., will affect their market prices.
Furthermore, policies and regulations and environmental protection requirements also have an impact on the price of acetic acid. If the government introduces stricter environmental protection policies, enterprises need to add environmental protection equipment and inputs in order to meet environmental protection standards, which will increase production costs and then affect the price of acetic acid.
In addition, fluctuations in the international market cannot be ignored. Global economic conditions, exchange rate changes, and international acetic acid trade policies will all have an impact on the domestic acetic acid market price.
Overall, in order to know the exact market price of acetic acid, we should pay attention to the trend of raw material prices, market supply and demand dynamics, changes in policies and regulations, and fluctuations in the international market in real time. Only by understanding these many factors can we have a more accurate understanding of the market price of acetic acid.