Imidazole-4-carboxaldehyde

Caramel, also known as maltose, has a wide range of main uses. In ancient times recorded in Tiangong Kaiwu, the use of caramel was first used for consumption. Its sweet taste and unique taste can add a different taste to the diet. In the daily diet of the ancients, caramel was often used as a sweetener to prepare all kinds of sweets, such as making sugar cakes, sugar cakes and other snacks, which can make the taste of snacks sweeter and widely loved by the public.
In addition, caramel is also important in cooking seasoning. It can be used as a seasoning agent to add unique flavor to dishes. When cooking meat, adding caramel can help it color, make the meat ruddy and attractive, and can enhance the taste and make the meat more tender. When pickling food, caramel can also play a role, which can adjust the saltiness, enrich the taste level, and make the pickled product taste better.
In addition, caramel is also used in the field of medicine. Traditional Chinese medicine believes that caramel is warm in nature, sweet in taste, and has the functions of nourishing deficiency, building Zhongyi Qi, relieving pain, moisturizing the lungs and relieving cough. It can be used to treat abdominal pain, lung dryness and cough, etc. It is often used as a compatible ingredient in traditional Chinese medicine formulas to assist in the development of medicinal effects. In ancient times, doctors used caramel as medicine to heal many patients and help the health of the people. From this perspective, caramel played an important role in diet, cooking, and medicine in ancient times, providing indispensable assistance to many aspects of ancient people's lives.

Mercury is a genus of metals, with unique properties that are completely different from ordinary things.
Mercury is in a liquid state at room temperature, which is its remarkable physical property. Looking at metals, most of them exist in a solid state, while mercury alone overflows like beads, smooth and amorphous, like smart water, but has the quality of metal, shining and shiny.
The melting point of mercury is extremely low, only -38.87 ° C, and it easily melts into a liquid when it is slightly hot. And its boiling point is not very high, about 356.6 ° C. Therefore, mercury is prone to physical changes in ordinary environments. When heated, mercury can quickly change from liquid to gaseous state, evaporate in the air, and disappear quietly, like an invisible ghost.
The density of mercury is quite high, reaching 13.59 grams/cubic centimeter, which is heavier than other common things. Take water as an example. The density of water is only 1 gram/cubic centimeter, and the density of mercury is far higher. Therefore, mercury in water must sink to the bottom, like a stone falling into an abyss, without floating state.
Mercury has good electrical conductivity, although it is slightly inferior to good conductors such as copper and silver, it is still a conductive material. In the circuit, if used reasonably, it can also be used to transfer electricity and form a current path.
Furthermore, the surface tension of mercury is quite large. When it drops on a plane, it often gathers into round beads, which are not easy to spread out. When the beads are combined, they can also be fused into one, as if they have the force of mutual attraction. This characteristic makes mercury show a unique shape in many occasions, either scattered or aggregated, which has its own interest.

Arsenic and mercury are all chemical substances, and their properties are different. In ancient times, they were also often involved in alchemy by alchemists. Today, they are also important in chemistry. A detailed study of their properties is of great benefit to all things.
Arsenic has different qualities of yellow, gray, and black. Gray arsenic is common and has a metallic luster. Under normal temperature, the chemical properties are still stable, but in case of strong heat or oxidizing agents, it will change violently. It can be combined with oxygen to produce arsenic trioxide, which is a highly toxic substance, and the ancient "arsenic" is also the same. If people take it by mistake, it will endanger their lives. It can also react with acid to produce hydrogen arsenide, which is also a very toxic gas. Arsenic in metallurgy can increase the strength of alloys. In pesticides, it can prevent insects and protect seedlings. However, it should be used with caution because of its toxicity.
Mercury, commonly known as mercury, is the only metal that is liquid at room temperature. It flashes silver and flows slippery. Mercury is highly volatile, and its vapor is highly toxic. If inhaled, it will harm the human body and damage the brain and nerves. It is chemically active and can form amalgam with polymetals, such as gold and silver in contact with mercury, which can be mixed with it. Mercury and sulfur are easily combined, generating mercury sulfide, and the color of vermilion, which was also used in alchemy and pigments in ancient times. In the chemical industry, mercury can be used as an electrode; in medicine, it was also used in the past, but now it is discarded due to toxicity. And mercury can be recycled in the environment, poll < Br >
is based on the properties of arsenic and mercury, which are beneficial and harmful. Those who use it must be well aware of its properties and follow the rules to prevent its toxicity and harm in order to achieve the purpose of profit.

The synthesis of methyl ether has been known for a long time, and it has been explored and pondered by generations of talents.
One is obtained by dehydration of methanol. The methanol is dehydrated by high temperature and the action of a catalyst, and a molecule of water is removed from the methanol molecules to form methyl ether. The process is as follows: In a special reaction vessel, a catalyst with excellent activity, such as γ-alumina, is placed, and then the methanol vapor is slowly introduced. Control the temperature in a suitable range, about 250 to 300 degrees Celsius. Under the action of the catalyst activity check point, the methanol undergoes an intermolecular dehydration reaction, and its chemical equation is: 2CH-OH → CH-OCH-O + H-O. The reaction conditions are relatively mild, and the raw material of methanol is easy to obtain, so it is a common synthesis path.
The second can be prepared from synthesis gas. Using carbon monoxide and hydrogen as raw materials, under specific catalyst and reaction conditions, methanol is formed into methanol, and methanol is then dehydrated to synthesize methyl ether. The key to this method lies in the ratio of carbon monoxide and hydrogen, and the choice of catalyst. Commonly used catalysts include composite catalysts containing elements such as copper, zinc, and aluminum. First, carbon monoxide and hydrogen react under the action of the catalyst to generate methanol, that is, CO + 2H ² → CH 🥰 OH. Then the methanol is converted into methyl ether as described above. This path can make full use of the synthesis gas obtained from the reforming of coal, natural gas and other resources, broaden the source of raw materials, and has great prospects for industrial application.
There is also a method of reacting halogenated methane with sodium alcohol. Take halogenated methane, such as chloromethane, and react with sodium alcohol, such as sodium methoxide, in a suitable organic solvent. The halogenated atom of halogenated methane reacts with the alkoxy group of sodium alcohol to form methyl ether. The reaction formula is: CH < Cl + CH < ONa > CH < OCH < NaCl. This method reacts more directly and the product purity is also high. However, halogenated methane is mostly toxic, and the preparation of sodium alcohol is slightly complicated, which has certain limitations in large-scale production.
The above methods for synthesizing methyl ether have their own advantages and disadvantages. It is necessary to carefully choose the appropriate method according to the actual demand, the availability of raw materials, cost considerations, and process conditions.

The method of alchemy is subtle and mysterious, and many matters need to be treated with caution during the storage and transportation of mercury.
Mercury is lively and volatile. If there is a slight omission in the storage device, it will easily escape from the outside, and the drug-causing power will be damaged. And if its qi is inhaled by people, it will be harmful to the body and mind. Therefore, when storing mercury, it should be a closed and tight device, and the wall of the device should be solid and heavy to prevent leakage and volatilization.
As for transportation, the road is bumpy, and the container of mercury must be placed stably, and it should not be dumped and collided. If mercury spills out, it is extremely difficult to clean up, and mercury seeps in contact with soil, and sinks in contact with water. After it is scattered, it is difficult to find traces, and it will also pollute the environment. Therefore, when transporting, it should be carried out slowly and carefully in a special place with a built-in soft liner and a mercury stabilizer.
In addition, mercury is easy to combine with other things, and the storage and transportation place should not have things that are easy to react with. If it is mixed with other things, or the properties of mercury are changed, it will lose its original effect. And the storage place should be a cool and dry place to avoid fire and heat. When mercury is heated, it will boil, and it will break easily, causing a disaster.
Furthermore, those who manage the storage and transportation of mercury should be familiar with its properties and act cautiously. Don't be careless, so as not to cause accidents. It is very important in the way of alchemy. If there is a slight mistake, not only will the pill fail, but it will cause disaster. Therefore, everything needs to be paid attention to in detail and follow the ancient methods to keep the mercury intact and use it for alchemy.