4-BROMOPYRIDINE-3-CARBONITRILE

Mercury is the master of hardware, so it is called lead. Lead is the master of hardware, and its main use is quite extensive and crucial.
In the art of alchemy, lead is the key thing. The ancients believed that lead contains a unique Qi, which can be reconciled with other medicines through exquisite refining methods, and the ability to form pills is great. For example, there are many alchemy methods described in "Baopuzi · Nei Chapters", and lead is often an indispensable raw material. Based on lead, with mercury and other substances, it can be delicately controlled by the heat, or it can refine an elixir that prolongs life and is otherworldly.
In the field of casting tools, the role of lead cannot be ignored. Because of its relatively low melting point, it is easy to melt and cast, and has certain toughness and corrosion resistance. In the past, when clocks were cast and tripods were made, lead was often used. When clocks were cast, the addition of lead could make the bell more melodious and clear, and the sound could be heard far away. When the tripod was made, lead could enhance the structural stability of the tripod, so that it would not be damaged over time.
In medicine, although lead is toxic, it can also be used as medicine after being processed. Ancient physicians, well aware of the characteristics of lead, used lead as medicine to treat certain sores, swelling and poisoning. Lead pills made from lead are used externally on the affected area, or have the effect of pulling poison and producing muscles and astringent sores.
However, lead also has its disadvantages. Excessive use or improper disposal can easily cause poisoning. Therefore, when the ancients used lead, they were also extremely cautious and tried to use it to avoid harm, so that it played an important role in alchemy, casting tools, medicine and many other fields, providing assistance for the ancient people's life and exploration of the unknown world.

The method of making methyl ether has not been used in ancient times, but according to the knowledge and technology of this world, the method of making methyl ether can be obtained.
First, methanol is used as a raw material, and the method of catalyzing water can be obtained. Under the action of specific catalysts, such as γ-oxidation or molecules, methanol is subjected to an appropriate degree of force, and the molecule removes a molecule of water to form methyl ether. The inverse formula of its transformation is:\ (2CH_ {3} OH\ stackrel {catalytic} {\ longrightarrow} CH_ {3} OCH_ {3} + H_ {2} O\). This inverse is mixed and methanol is easy to obtain, so it is often used.
Second, methyl ether is directly synthesized from synthesis. Synthesizer, the mixing of carbon monoxide is also. With appropriate catalysis, such as - - catalysis, etc., under a certain degree and force, carbon monoxide can generate a reaction. In addition to generating methanol, methanol can be synthesized into methyl ether in one step. This reverse process involves steps such as adding carbon monoxide to methanol and methanol to water to generate methyl ether. The reverse formula can be roughly:\ (3H_ {2} + 2CO\ stackrel {catalytic} {\ longrightarrow} CH_ {3} OCH_ {3} + CO_ {2}\). The key to this method is that it can be synthesized by directly using coal, natural coal and other sources. The source of raw materials is extensive, and it can effectively utilize carbon sources, which has a certain development prospect.
Third, ethanol catalyzes water to form methyl ether. Under the action of some catalysts, ethanol removes one molecule of water from the molecule to obtain methyl ether. However, in this method, due to the chemical properties of ethanol, it may be accompanied by the formation of ethylene and other by-products, so it is necessary to refine the catalytic process and control the reaction process to improve the efficiency of methyl ether. The reaction formula is:\ (C_ {2} H_ {5}\ OH stackrel {catalytic} {\ longrightarrow} CH_ {3} OCH_ {3} + H_ {2}\).
All these methods have their own advantages and disadvantages, and they need to be used according to factors such as demand, raw material supply, and cost considerations.

Lead and mercury are common in ancient times. Lead is heavy and soft, silver-gray in color, and stable in nature. Its melting degree is quite low, only more than 300 degrees, easy to melt, cast and shape, and can be used for utensils and pipes. And because of its good corrosion resistance, it is widely used in hydraulic facilities. However, lead is poisonous, and it can cause illness, damage the viscera, and confuse the mind.
Mercury, commonly known as mercury, is the only liquid metal at room temperature. It is white and bright, and flows like silver. It is very dense, volatile, and highly toxic to steam. Mercury has high activity and can form amalgams with many metals. This property is widely used in metallurgy and alchemy. The ancient alchemists often used mercury to make pills, thinking that taking them could prolong life. It was a big fallacy. Mercury toxicity accumulated in the body, which was very harmful.
Looking at lead and mercury, although they are usable, their toxicity should not be underestimated. The ancients caused harm to themselves due to their limited understanding. Today's people should understand their nature, make good use of them and be careful to prevent their harm. It is the right way to control these two types of substances with scientific methods.

Looking at the market situation of A-vegetables today, its prospects can be discussed from several perspectives.
From the perspective of people's livelihood needs, A-vegetables are commonly used in the daily diet of the people, regardless of the rich or poor, they are all needed. The market is well-versed, every time it is time to cook, fresh vegetables must be included in the meal, and A-vegetables are among them, and the demand is stable. And in recent years, the public's intention of health preservation has gradually become stronger. A-vegetables are rich in nutrients and beneficial to health, so buyers are more numerous. This is the foundation of the A-vegetable market situation.
Again, the difficulty of planting is discussed, and the method of planting A-vegetables is not extremely difficult. Farmers have been passed down from generation to generation, and with the assistance of today's agricultural techniques, they can grow more. However, it is also necessary to check the weather at the right time and place in order to ensure its quality and quantity. And the growth cycle of A and vegetable is appropriate, not time-consuming for a long time, so that it is not too delayed during agricultural time deployment, and it is also beneficial to the market at the planting end.
As for the circulation of market trade, the output of A and vegetable origin is considerable, and the four-sided merchants converge, and it is transported by car and ship to various places. In the vegetable market and supermarket in the city, it has its shadow. And today's logistics is convenient, the freshness of A and vegetable can be guaranteed, and the time from the origin to the place of sale is greatly reduced, without damaging its quality, and it must be guaranteed to travel freely in the city.
However, the market of A and vegetable also has hidden worries. First, changes in climate, wind and rain from time to time, droughts and floods are impermanent, all of which can damage their harvests. If there is a natural disaster and the place of origin is affected, the supply in the city will be reduced, and the price may rise due to it. Second, the disturbance of competing products, there are many kinds of vegetables, new species come out when they are grown, or those with similar taste and nutrition will be divided into their market benefits. Third, the price of agricultural materials, fertilizers, pesticides, etc. If there is a fluctuation, the cost of growing A vegetables will change accordingly, which will also affect their market price and profit.
To sum up, the market prospects of A vegetables, although there are favorable demand, planting, circulation, etc., are also constrained by factors such as climate, competing products, and costs. The people in the city, when observing the situation, anticipate good luck and bad luck, plan and then move, in order to profit from the market of vegetables.

When storing and transporting methyl ether, everyone should pay attention to it.
The first priority is safety, methyl ether is flammable, and it can be mixed with air to form an explosive mixture. Therefore, the storage place must be kept away from fire and heat sources, and must be well ventilated. If the gas accumulates in a closed space, it will cause combustion and explosion in case of open flame and high heat energy, endangering life and property, which must not be ignored.
The second is related to the container. When storing methyl ether, a special pressure-resistant container should be used, and its tightness should be ensured. Because the methyl ether is gaseous at room temperature and pressure, if the container is not well sealed or under pressure, the methyl ether will escape, which will cause material loss and increase safety hazards. During transportation, it is also necessary to prevent the container from colliding and damaging, resulting in the leakage of methyl ether.
Furthermore, the control of temperature and humidity is also critical. Excessive temperature can cause the vapor pressure of methyl ether to increase, increase the pressure on the container, and risk bursting; if the humidity is too high, it may cause the container to rust, which will damage its strength and sealing. It is appropriate to maintain the appropriate temperature and humidity in the place of storage. According to the physical properties of methyl ether, the temperature should generally not exceed 30 ° C, and the humidity should be controlled within a reasonable range.
When transporting, it must be in accordance with relevant laws and regulations, choose transportation tools in compliance, and transport personnel should be familiar with the characteristics of methyl ether and emergency treatment methods. Transportation vehicles must be equipped with fire extinguishing and leakage emergency treatment equipment to prevent accidents.
In short, the storage and transportation of methyl ether, safety first, in the container, temperature and humidity, transportation and other aspects, should be careful attention, in accordance with the rules of operation, in order to ensure foolproof.