pyridine, 2-ethyl-

Caramel is a sugary food made from fermented and saccharified grains such as rice, barley, wheat, millet or corn. It has many main uses and plays a significant role in cooking and seasoning. Because of its unique sweetness, it can increase the sweetness and color of dishes. For example, when cooking braised pork, adding caramel can make the meat red and attractive, and the sweetness is mellow, making the dishes more flavorful. When making cakes, caramel can adjust the humidity and hardness of the dough, prolong the shelf life of the cakes, and at the same time add the sweet taste of the cakes, making the texture of the cakes softer. For example, traditional Chinese pastry Sachima, caramel is one of the important raw materials.
In the field of medicine, caramel also has many effects. Its nature is sweet and warm, and it returns to the spleen, stomach, and lung meridians. It has the effect of nourishing the middle and nourishing qi, relieving pain urgently, moisturizing the lungs and relieving cough. There is a record of caramel being used as medicine in "Qianjin Fang". When people have spleen and stomach deficiency and abdominal pain, caramel can help warm the middle and replenish the deficiency, and relieve the pain urgently. If the lungs are dry and coughing, the throat is dry and the mouth is dry, and the role of caramel in moisturizing the lungs and relieving the cough can be exerted to relieve the symptoms of cough.
In addition, caramel is of great significance in the inheritance of traditional food production processes. The production of many traditional snacks is inseparable from caramel, such as sugar melon and Guandong sugar, which carry rich folk culture and historical memory. During traditional festivals, such as the 23rd of the twelfth lunar month, sugar melons became an important offering, and this custom has continued to this day. Caramel has become an important link between ancient and modern cultural heritage, allowing people to experience the charm of traditional culture while tasting delicious food.

B is basically a colorless transparent liquid with a slightly sweet taste and has the following physical properties:
Its melting point is low, about -138.3 ° C, which makes B basically in a liquid state at room temperature. The boiling point is relatively low, around 13.2 ° C. If the external ambient temperature is slightly higher or heated, B can easily change from liquid to gaseous volatilization.
The density of B is smaller than that of water, about 0.446g/cm ³. When B is mixed with water, B will float on the water surface, and the two are obviously layered.
B is difficult to dissolve in water. Due to the large difference between its molecular structure and water molecules, it is difficult to form an effective force between the two to achieve mutual solubility. However, B can be miscible with ethanol, ether and other organic solvents in any ratio, which is due to their similar molecular structure and polarity, in line with the principle of "similar miscibility".
B also has the characteristics of volatile, because of its low boiling point, at room temperature and pressure, the thermal movement of B molecules is more intense, easy to break free from the surface tension of the liquid and enter the gas phase, causing B to evaporate rapidly. When using B, its special smell can often be smelled around.
B's vapor is heavier than air, about 1.59 times the density of air, which makes the vapor generated by B volatilization close to the ground or accumulate in low-lying areas, which poses a certain safety hazard. In case of open flames or high heat energy, it will cause combustion and explosion.

The fool wants to know the chemical properties of ethanol, and I will tell you in detail. Ethanol, commonly known as alcohol, is an organic compound with the chemical formula C ² H OH.
First, ethanol is flammable. In the air, it is very easy to burn when exposed to open flames and hot topics. The chemical equation for combustion is: C ² H OH + 3O ³ $\ stackrel {ignited }{=\!=\!=}$ 2CO ³ + 3H 2O O. Looking at this reaction, ethanol reacts violently with oxygen to emit a light blue flame, and at the same time emits a lot of heat, which can provide energy for human life and production.
Second, ethanol can react with sodium metal. When ethanol and sodium meet, the sodium particles settle at the bottom of the ethanol, slowly forming bubbles. The chemical equation for this reaction is: 2C ² H OH + 2Na = 2C ² H ONa + H ² ↑. In this reaction, the hydrogen in the ethanol hydroxyl group is replaced by sodium, reflecting that ethanol has certain reactivity.
Third, ethanol can undergo a catalytic oxidation reaction. Under the condition of copper or silver as a catalyst and heating, ethanol can be oxidized by oxygen to acetaldehyde. The chemical equation is: 2C ² H OH + O ² $\ stackrel {Cu or Ag} {\ overrightarrow {\ triangle}} $2CH 🥰 CHO + 2H 2O O. In this process, the ethanol molecule removes two hydrogen atoms and combines with oxygen to form water, which itself converts into acetaldehyde.
Fourth, ethanol can esterify with carboxylic acids. Take the reaction of ethanol and acetic acid as an example, under the condition of concentrated sulfuric acid as a catalyst and heating, ethyl acetate and water are formed. The chemical equation is: CH < COOH > C < H < OH > $\ underset {\ triangle} {\ overset {concentrated sulfuric acid} {\ rightleftharpoons}} $CH < COOC < H > + H < O. This reaction is a reversible reaction. Concentrated sulfuric acid has both the functions of catalysis and water absorption, which prompts the reaction to proceed in the direction of forming ethyl acetate.
Ethanol has rich and diverse chemical properties and is widely used in many fields such as chemical industry, medicine, food, etc. It is actually an important organic compound.

The method of ethyl acetone has many ways. One method can be obtained from ethyl acetate and acetone, and the reaction is reversed. This reaction is catalyzed by alcohol, and at an appropriate temperature and temperature, ethyl acetate and acetone interact to form a reaction, and then form ethyl acetone. The reaction is the ethoxy group of ethyl acetate, and the α-atom of acetone is reacted and cracked to form this compound.
Another method can be obtained from butanol and acetic acid. In the presence of a specific catalyst, a series of reactions such as esterification and water are obtained. First, under the catalysis of acid, butanol and acetic acid are esterified to form butyl acetate. However, butyl acetate is esterified in water under specific conditions, and then a series of reactions are made to obtain ethyl acetone. In this way, it is necessary to pay attention to the control of the reverse components, such as the degree of resistance, the amount of catalysis, etc., in order to ensure the efficiency of the reaction, and to obtain a high yield.
Furthermore, ethyl acetone can also be synthesized from diethyl malonate and 1-bromopropane raw materials. The reaction of diethyl malonate and alcohol can generate carbon molecules, and the carbon molecules can be generated from 1-bromopropane. The steps of hydrolysis and carboxylic acid can be ethylacetone. In this process, the degree of hydrolysis and the degree of carboxylic acid need to be precisely grasped. All of them have important implications for the generation of the best product. Therefore, the methods for synthesizing ethylacetone are different, each with its own characteristics and ease, depending on the required and combined methods.

Alas! Those who want to make good use of acetylene should pay attention to all things.
The first one is flammable and explosive, so the place used must be kept away from fire sources and static electricity. When storing, transporting, and using it, you need to beware of sparks emerging. If you are near fireworks, in an instant, disaster will come, endangering lives, destroying property, but you can be careless!
Second, the gas of acetylene is denser than the air, and it is easy to gather in low places. Therefore, the place used must be well ventilated, so that the gas can be dissipated, so as not to accumulate and cause danger. If you are in a secret room, the gas cannot be vented, and if you encounter something that ignites fire, the explosion will be heard immediately, and the disaster will be severe.
Furthermore, when operating, you must follow the regulations. The equipment used must be up to standard and in good condition. Be careful when installing and unloading, and do not be careless. If the valve is opened and closed, it should be slow and stable, and do not allow gas to burst out. And always check the equipment to see if there is any leakage. If there is a slight leak, repair it immediately, otherwise, the hidden danger will be hidden, and it will eventually be a big disaster.
When it is used in combination with oxygen, the ratio of the two must be accurate. Improper ratio, inefficient combustion, and the risk of deflagration. The operator must be familiar with its nature and skilled in deployment, so as to be safe.
In addition, those who use acetylene should be prepared for emergency measures. Familiar with fire fighting methods, put fire extinguishers nearby. Once something happens, you can quickly save it and reduce the damage to the first child.
In short, when using acetylene, you must be cautious. Keep in mind all the things you need to pay attention to in order to use it safely and avoid disasters.