Quinoline-2-carbonitrile

In the matter of cooking, the power of the charcoal is strong and fierce, and it lasts for a long time and is stable. When cooking, the water in the pot boils quickly, and the food is easy to cook. When cooking soup, the heat is even, the taste of the ingredients is easy to melt, and the soup is rich and delicious. Grilled meat can make the meat burn quickly, but the inside is still fresh and tender, the outside is crisp and the inside is moist, and the aroma is overflowing.
Furthermore, for heating purposes, the dimethyl charcoal is placed in the square, and the room is getting warmer, its temperature is moderate but not dry. In the cold night, sitting around the stove, charcoal fire stars splash, and the warmth is overwhelming, which can resist the cold of the bones. And when it burns, it smokes less, does not pollute the air, and does not damage indoor utensils.
In the industry of alchemy and pharmaceuticals, dimethyl charcoal is particularly crucial. In the pill furnace, dimethyl charcoal is used to control the temperature. According to the needs of the pill prescription, adjust the size and duration of the heat. Precise heat, only then can you get the miraculous effect of the pill, or prolong life, or cure diseases and diseases.
In the ritual of sacrifice, dimethyl charcoal is also commonly used. Burned in the furnace, cigarettes curl, solemn and solemn. Its fire is prosperous, which means that the family is prosperous and the cause is prosperous. Everyone is by the side, in awe, praying for well-being.
All of these, it can be seen that dimethyl charcoal has irreplaceable power in cooking, heating, alchemy, and sacrifice. It was also an important thing for the ancients in many aspects of life, production, and belief.

As recorded in "Tiangong Kaiwu", there are several methods for the synthesis of square lead-2-methyl sulfur:
First, lead and sulfur are used as raw materials. For lead, the texture is heavy, the color is silver gray, and the softness can be extended. Sulfur is yellow like gold and has a unique smell. Put the lead in a crucible, heat it with charcoal fire, and wait for it to melt into a liquid state, which is like silver water and shines. At this time, sulfur is slowly added, and the sulfur melts when heated, and blends with the liquid lead. In the meantime, a shovel is used to keep stirring to mix the two evenly. As the reaction proceeds, the smoke in the pot can be seen rising, accompanied by a pungent smell. After the reaction is completed, the product obtained after cooling is square lead-2-methyl sulfur. In this process, the control of the heat is extremely critical. If the fire is fierce, lead is easy to evaporate, and if the fire is small, the reaction is slow, so it is difficult to obtain the ideal product.
Second, lead-containing ores can be co-refined with sulfur-containing ores. First, the lead-containing ores and sulfur-containing ores are broken separately to make their particle size suitable and easy to fully react. Mix the two in a certain proportion and place them in a special refining furnace. The furnace uses char as fuel and ignites a raging fire. When the temperature rises in the furnace, the ore is decomposed by heat, and the components of lead and sulfur are combined. The furnace is equipped with a vent to control the air circulation in the furnace to ensure that the combustion is sufficient and the reaction is smooth. Under the action of high temperature, the ore gradually melts and reacts to form square lead-2-methyl sulfide. The raw materials of this method are easily available, but the purity and proportion of the ore are quite high. If the proportion is improper, the product is impure, which affects its quality and use.
Third, there is also a method of reacting lead salts with sulfide solutions. Select suitable lead salts, such as lead nitrate, which are easily soluble in water to form a colorless and transparent solution. Another sulfide, such as sodium sulfide, is also soluble in water, and the solution is slightly yellow. The sodium sulfide solution is slowly dropped into the lead nitrate solution, and a black precipitate can be seen in the solution in an instant. This precipitate is square lead-2-methyl sulfide. The reaction process needs to be carried out at room temperature and stirred evenly to make the reaction rapid and complete. After the reaction, through filtration, washing, drying and other steps, pure square lead-2-methyl sulfide can be obtained. This method is relatively simple to operate, the product purity is high, but the raw material cost is relatively high, and some raw materials have certain toxicity. Caution is required during operation.

Fuyang flintlock, the ancient weapon of fire, with its shape like a round mirror, it can concentrate light to make fire, and its theory is exquisite. The physical properties of Yang flintlock-2-methyl ether also have many things to report.
Methyl ether, under normal temperature and pressure, is a colorless gas, and smells a slight ether-like odor. Its boiling point is quite low, about -24.9 ° C, which makes it easy to evaporate. In a normal temperature environment, it can be dispersed in the atmosphere in an instant. In addition, its melting point is -141.5 ° C, and when it solidifies, it needs to be extremely cold. < Br >
Looking at its density, it is slightly heavier than air, about 1.97 kg/m ³, so in space, if there is methyl ether leakage, its gas tends to deposit below. The solubility of methyl ether is also an important physical property. It is soluble in water, but its solubility is limited, and it can be miscible with organic solvents such as ethanol, ether, and acetone in any ratio. This property makes it widely used in the chemical industry and can be used as an excellent solvent.
Methyl ether is flammable, and it is highly flammable and explosive in case of open flames and hot topics. This is one of its dangerous characteristics. Its vapor and air can form an explosive mixture, the explosion limit range is 3.4% - 17.0% (volume fraction), so in the storage, transportation and use of the process, need to be very careful to prevent the risk of explosion.
The physical properties of methyl ether, such as gaseous shape, special odor, low boiling point, solubility, flammability, etc., determine its use in industry, life and many other aspects and latent risk, know its nature, can be used to avoid its harm.

Lead powder is also the powder made of lead. Its chemical properties are very important and involve many costs, and let me come to them one by one.
The chemical properties of lead powder are the first to react with acid. In case of dilute acid, lead powder changes and produces hydrogen gas. In case of dilute sulfuric acid, there is the following reaction: lead and dilute sulfuric acid come into contact, lead turns into lead sulfate, and hydrogen escapes. This hydrogen is lighter than air, flammable and colorless and odorless. Looking at this reaction, it can be seen that lead powder is active and can change dramatically in acid.
Furthermore, lead powder is not safe in air. It can slowly combine with oxygen to gradually oxidize lead. The color of lead oxide, yellow or red, depends on the degree of oxidation. Although this change is slow, the years pass, and the color and texture of lead powder are changed.
Lead powder also has a unique performance in lye. Although it does not react violently with acid, it also changes accordingly. It can form a complex with a strong base, and the properties of this complex are different from lead powder and alkali.
Lead powder can also react when it encounters a strong oxidant, such as hydrogen peroxide. Lead powder is oxidized, and its valence state increases, giving rise to other lead compounds.
The chemical properties of lead powder are both active and complex. In acid, hydrogen is generated, in air, it is oxidized, in alkali, it can form a complex, and in case of strong oxidizing agent, it is in a variable valence state. Such various properties make lead powder useful in various industries such as chemical industry, pigment, and medicine. In chemical industry, it can be used as a raw material to make other things; in pigments, because of its white color and covering power, it can be used as a pigment; in medicine, it was also said to be used in medicine in ancient times, but lead is toxic. Today's medical use must be cautious.

Fuyang flintlock makes fire in the sun, and Fang Zhu draws water in the moon, all of which are felt by their kind. Today, when discussing the storage and transportation of A-vegetables, we should carefully observe and proceed with caution.
When storing, the first environment. It is advisable to choose a cool, dry and ventilated place. A vegetable likes to be dry, but if it is in a humid place, it is perishable. If it is placed in a dark and wet corner, mildew will breed in a few days, and its quality will be damaged. And the temperature also needs to be suitable. If it is overheated, A-vegetables are easy to wilt, and if it is too cold, it may cause frostbite. Take spring as an example, the yang is gradually rising, and the temperature is getting warmer. If you do not pay attention, A-vegetables may quickly rot due to heat.
Furthermore, the storage place should be clean and free of filth If it coexists with sundries and filth, the nail and vegetable are easy to stain and odor, and the filth invades it, and its shape and quality will change. If placed next to rancid objects, although the nail and vegetable are strong, it is difficult to avoid their infection and lose their original taste.
As for transportation, packaging is very critical. When wrapping the nail and vegetable with a flexible and breathable material, it will not be squeezed. If it is packed with a coarse and hard object, the car will be bumpy, and the nail and vegetable will be fragile, which will damage their appearance. And it is necessary to prevent it from losing water. You can cover it with a damp cloth or put it with a moisturizing device, but it should not be too wet to avoid ulceration.
The temperature and humidity on the way should also be controlled. In summer, the sun is like a fire. If you don't avoid the hot sun during transportation, the vegetables will be exposed to the high temperature and wither immediately. In winter, the frost and snow are cold. If there is no way to keep warm, the vegetables will become stiff in case of cold. Therefore, it is necessary to adapt to local conditions. In summer, it is advisable to drive in the morning and evening, and in winter, you need to cover them with warm things.
In addition, when transporting, you should speed up without delay. After a long delay, the freshness of the vegetables will gradually lose. Although there are methods of storage and good packaging, it is difficult to reverse their qualitative changes. If you travel on the road, you will be blocked and stay for a long time, and the vegetables will gradually be damaged in the car. When you arrive at the destination, it is no longer the best state for first picking. < Br >
Therefore, the storage and transportation of nail and vegetable, environment, packaging, temperature and humidity, and speed are all important, and should not be careless.