pyridine-3-boronic acid HCl

What is the main use of borax-3-borate? "Tiangong Kaiwu" says: "Borax and boric acid are widely used in metallurgy, chemical industry, and medicine."
In metallurgy, boric acid and borax can be used as fluxes. When melting metals, adding an appropriate amount of borax can reduce the melting point of metals, making them easier to melt and cast. And it can remove impurities in metal liquids and improve metal purity and quality. For example, when casting copper, borax can make the copper liquid purer, the texture of the cast copper ware is better, and pores and trachoma are reduced.
In the chemical industry, boric acid and borax are also important raw materials. Can be used to make various borides, such as borate glass. This glass has hot topic stability, chemical stability and low coefficient of expansion, and is widely used in the manufacture of optical instruments, heat-resistant appliances, etc. Borax is also used in the manufacture of detergents, preservatives, and is also used in the printing and dyeing industry to make dyes better adhere to fabrics and improve dyeing effects.
In medicine, boric acid has a certain disinfection and antiseptic effect. It is commonly found in some external disinfectants and eye drops, and can be used to clean wounds, prevent infections, and maintain eye hygiene. Borax is also occasionally used in traditional Chinese medicine. It has the effect of clearing away heat and detoxifying, reducing swelling and antiseptic. However, due to toxicity issues, it should be used with caution.
To sum up, boric acid and borax play an indispensable role in metallurgical melting, chemical raw material preparation, medical disinfection and anti-corrosion, etc., and have a profound impact on the development of various industries.

There are various ways to make boron. One is to combine borax with sulfuric acid. Borax is a common borate mineral, which is mixed with sulfuric acid and reacts at a suitable temperature. The reaction formula is roughly as follows: Borax ($Na_2B_4O_7 · 10H_2O $) interacts with sulfuric acid ($H_2SO_4 $), boric acid ($H_3BO_3 $) and sodium sulfate ($Na_2SO_4 $), boric acid is heated and dehydrated, and finally boron trioxide is obtained. Boron can be obtained by reduction of active metals such as magnesium and aluminum.
The second is the reduction of boron halide. Taking boron halide, such as boron trichloride ($BCl_3 $) as an example, at high temperature and in the presence of hydrogen gas, hydrogen can reduce boron trichloride from boron. This process requires delicate temperature control, and the flow rate of the gas also needs to be strictly controlled. Because boron trichloride is highly corrosive and toxic, it must be well protected during operation.
There are also those who use boromignesium ore as the starting material. Boron magnesium ore is first reacted with sodium hydroxide solution, and boron is transferred into the solution to form borate salt. After multi-step treatment such as acidification, boric acid can be obtained. Boron can also be prepared by dehydration and reduction.
Furthermore, electrolysis is also one way to produce boron. Boron-containing salts are melted in suitable fluxes, such as some alkali metal halides, to form a conductive melt. In the electrolytic cell, direct current is passed, and boron ions are obtained from electrons at the cathode, and boron is precipitated. This method has high requirements for equipment and huge energy consumption, so high-purity boron can be obtained.
The method of making boron has its own advantages and disadvantages, and needs to be carefully selected according to the actual required purity, output, and cost.

If you want to check the purity of hydroxypropionic anhydride, you can follow the following methods.
First, you can use the method of melting point determination. If hydroxypropionic anhydride is pure, its melting point should be within a certain range. Prepare a melting point tester, properly put the sample into a capillary tube, place it in the instrument to slowly heat up, and record the temperature of the initial and full melting of the sample. If the measured melting point matches the melting point of hydroxypropionic anhydride recorded in the literature or is within the allowable range of error, the purity of the sample is quite high; if the deviation is very far, the purity is worrying.
Second, gas chromatography can be used. This is a wonderful way to analyze the composition of the mixture. An appropriate amount of hydroxypropionic anhydride sample is injected into the gas chromatograph, and the instrument is separated by the chromatographic column with a carrier gas carrying the sample components. Each component has a different migration rate in the column according to its properties. Then it flows out of the chromatographic column one after another, and the detector detects and records the signal to obtain the chromatogram. According to the area of the peak of the hydroxypropionic anhydride in the chromatogram, compared with the standard peak area of known purity, the purity of the hydroxypropionic anhydride in the sample can be calculated.
Third, high performance liquid chromatography is also good. This is particularly effective for analyzing high boiling point, thermal instability and biomacromolecules. Take an appropriate amount of sample and inject it into a high-performance liquid chromatograph. The mobile phase-carrying sample passes through a column filled with a specific stationary phase. Each component of the sample interacts differently with the stationary phase, causing it to move at different speeds in the column and separate. After detection and recording by the detector, the chromatogram is obtained. Compare the peak area with the standard to determine the purity of the sample.
Fourth, elemental analysis is also a good idea. Detailed measurement of the content of each element in the sample is compared with the theoretical proportion of elements contained in hydroxypropionic anhydride. If the content ratio of each element is in good agreement with the theoretical value, the purity is high probability; if the deviation is obvious, the purity is suspicious.

Say to it: Borax is a commonly used thing, and there are indeed many things to pay attention to during storage and transportation.
Borax likes dryness and is afraid of moisture. If stored in a humid place, borax is susceptible to deliquescence, resulting in damage to its quality. Therefore, when storing borax in a dry and well-ventilated place, it should be packed in a sealed container to prevent moisture from invading.
In addition, although borax is not flammable and explosive, it should be avoided when transporting with acidic substances. When borax is covered with acid, it is prone to chemical reactions or deterioration of borax, which may also cause danger. It is necessary to ensure that borax is isolated from acidic substances during transportation.
In addition, borax has certain toxicity. Although it is less harmful during normal use, it should be guarded against leakage during storage and transportation. If it leaks accidentally, it should be cleaned up in time to avoid contact with humans and animals. If someone accidentally touches or eats borax, seek medical attention as soon as possible.
When transporting, you should also pay attention to the influence of temperature. Too high temperature or cause changes in the properties of borax, so it is appropriate to transport it in a room temperature environment and avoid direct sunlight for a long time.
In short, the storage and transportation of borax should be stored in a dry and ventilated place, sealed away from acidic substances, to prevent leakage, and pay attention to temperature and light, so as to ensure the quality and safety of borax.

The price of -3-butyric acid butyric acid bacteria is generally uncertain, and it varies depending on its quality, origin, supply and demand.
I have heard that those with high quality and famous origin must be expensive. Because of their high activity and good effectiveness, they are sought after by the public, so they are sold at a high price. If the water and soil are suitable for its production, and the method of breeding bacteria is exquisite, the butyric acid butyric acid bacteria produced by the city are all competing for, and the price is high, or it can reach tens or even hundreds of dollars, measured in a unit.
Of course, there are also ordinary ones. If the place of origin is not special and the breeding method is normal, although it has the quality of butyric acid butyric acid bacteria, the activity is slightly inferior and the quality is not high. This kind of product is in the market, and the price is slightly cheaper, or only a few dollars per unit. Because of its supply and demand, there is a large supply in the market, and there are not many people who want it, so the price should not be high.
Also looking at the market supply and demand trend, if for a while, everyone is looking for butyric acid butyric acid bacteria, which can be used in medicine and health care. < Br >
is based on the market price of -3-butyric acid butyric acid bacteria, which varies roughly from a few dollars to a hundred dollars. It is difficult to determine the exact number, and it all changes with various conditions.