2,4-dichlorothiazole-5-carbaldehyde

2% 2C4 dioxypentane-5-methyl ether is an organic compound, which has specific functions in many processes involved in "Tiangong Kaiji".
Dioxypentane has stable properties and is often used as an excellent organic solvent. In ancient printing and dyeing processes, in the pretreatment process before fabric coloring, dioxypentane can help the dye to disperse evenly, making it easier to combine the dye with the fabric fiber, achieving a uniform and firm effect. If the dye shop dyes silk, dioxypentane is used to dissolve the dye, so that the silk is well dyed and will not fade for a long time.
5-methyl ether, volatile and flammable. In the grease or wax used in ancient lighting, an appropriate amount of 5-methyl ether can be added to improve its combustion performance, and the flame is more stable and bright. When smelting metals, 5-methyl ether can be used as a combustion aid to increase the furnace temperature, accelerate the process of metal smelting, and improve the purity and yield of metals.
In the field of ancient pharmaceuticals, dioxypentane and 5-methyl ether are also used. Dioxypentane helps to extract the active ingredients of herbs, making the active ingredients more easily soluble. 5-methyl ether can adjust the properties of drug preparations, such as when making pastes and pills, it helps to shape drugs, and helps to release and absorb drugs in the body.
These two are used in many technical processes described in "Tiangong Kaiwu", either as solvents, combustion aids, or in pharmaceuticals. They are important materials for ancient production and life, and are of great significance to improving the level of technology and product quality.

In "Tiangong Kaiwu", ethane is a colorless and odorless gas. Its density is smaller than that of air, and it is difficult to dissolve in water.
When it comes to flammability, ethane is flammable and can be mixed with air to form an explosive mixture. In case of open flame and high heat energy, it will cause combustion and explosion, and the explosion limit is 3.0% - 12.4%. When burned, it emits a light blue flame and generates carbon dioxide and water. This reaction is violent and can release a lot of heat energy.
Looking at its chemical activity, although it is slightly more active than methane, it still has high stability under normal conditions. However, under specific conditions, such as high temperature and the presence of catalysts, various chemical reactions can also occur. Such as substitution reactions with halogens, in which hydrogen atoms are gradually replaced by halogen atoms; under appropriate conditions, cracking reactions can also be carried out to generate small molecule compounds such as ethylene.
Furthermore, the melting point of ethane is -183.3 ° C, and the boiling point is -88.6 ° C. Such a low melting point is due to the fact that ethane is a molecular crystal, and the molecules are maintained by a weak van der Waals force. Therefore, with a little energy, the molecules can break free and change from solid to liquid, and then become gaseous. This property makes ethane gaseous at room temperature and pressure. When storing and transporting, its pressure and temperature conditions need to be taken into account to ensure safety.

To make carbon dioxide, dilute hydrochloric acid and calcium carbonate can be used. Calcium carbonate is placed in a reaction vessel and slowly injected into dilute hydrochloric acid. The two react immediately, and carbon dioxide is generated. This reaction is smooth and easy to control, and medicines are common and easy to obtain. It is a common method for making carbon dioxide in the laboratory.
As for making ethylene, ethanol can be co-heated with concentrated sulfuric acid. Take an appropriate amount of ethanol first, put it in a flask, then slowly inject concentrated sulfuric acid along the wall of the vessel, and stir well with a glass rod. Heat to 170 degrees Celsius, and the ethanol is dehydrated under the catalysis of concentrated sulfuric acid to produce ethylene. Pay attention to temperature control, otherwise it is prone to side reactions.
To make methane, anhydrous sodium acetate and soda lime can be Mix anhydrous sodium acetate and soda lime finely, put it into a test tube, and fix it on an iron frame. Heat with an alcohol lamp to obtain methane. This reaction requires an anhydrous environment, the medicine needs to be dried, and the heating should be uniform.
The above methods each have their own requirements. The selection of raw materials and the control of reaction conditions are all about success or failure. During the experiment, it is necessary to strictly follow the procedures and operate carefully to obtain the required gas.

In the case of methyl ether, during storage and transportation, all kinds of matters must not be ignored.
Methyl ether is flammable and has a low ignition point. Therefore, the storage place must be kept away from fire and heat sources to prevent the generation of open flames and static electricity. In the warehouse, the electrical equipment should be explosion-proof to prevent the explosion of methyl ether caused by electrical sparks.
In addition, methyl ether is volatile, and the vapor density is greater than that of air, which is easy to accumulate in low places. The storage place should be well ventilated to prevent the accumulation of steam to the explosion limit. If the ventilation is poor, a little carelessness will cause unexpected disasters.
When transporting, there are also many precautions. The means of transportation used must meet safety standards, and the tank body needs to be strictly tested to ensure that there is no risk of leakage. During transportation, bumps and collisions should be avoided to prevent damage to the tank body.
At the same time, methyl ether is also harmful to the human body. If inhaled too much, it can cause anesthesia, asphyxiation, etc. Therefore, those who are engaged in the storage and transportation of methyl ether need protective equipment, such as gas masks, protective clothing, etc., to ensure their own safety.
And the storage and transportation place should be equipped with corresponding fire protection and emergency equipment, such as fire extinguishers, leakage emergency treatment tools, etc. Once an accident such as leakage occurs, it can be responded quickly to reduce losses.
The storage and transportation of methyl ether is related to safety, and all aspects must be carried out with caution and must not be taken lightly, so as to ensure foolproof.

In today's world, business conditions are treacherous, and the market is fickle. It is not easy to know the market prices of dioxypropane and pentane. However, it can be deduced slightly from the past situation and the current situation.
Dioxypropane has a wide range of uses, and is often an important item in the chemical industry. The change in its market price is related to the abundance of raw materials, and it is also related to the clumsiness of the process. It is also related to government orders and requirements. In the past, if raw materials were abundant, the process was advanced, and the government orders were loose, and there were many people seeking them, the price might rise steadily; if raw materials were scarce, the process was blocked, the government orders were strict, and the demand was low, the price might fall. Looking at the moment, the state of raw materials, the state of craftsmanship, the regulations of government orders, and the state of demand are all variables. However, roughly speaking, if everything goes well, its price may fluctuate within a certain range, so as not to have too great a change.
As for pentane, it is also a commonly used material in the chemical industry. The state of its market also follows the common sense of business. The availability of raw materials, the difficulty of preparation, and the amount of market demand are all factors that affect its price. Gu Yun: "What is rare is expensive, and what is more is cheap." If pentane produces abundant output, but the market demand does not increase, its price may not rise; on the contrary, if the output is scarce, and there are many people seeking it, the price may rise. At this time, various factors are mixed, and although it is difficult to determine the exact price, it is also possible to predict the approximate trend according to the business conditions.
In short, the market prices of dioxypropane and pentane, such as changes in the situation, it is difficult to predict the exact number. However, according to the rules of the business road, the experience of the past, and the current situation, you can also know the approximate state, which can provide a reference for businesspeople and entrepreneurs to plan.