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Monoethyl Adipate, Adipic Acid What are the common uses of Monoethyl Ester
Monoethyl Adipate and Adipic Acid Monoethyl Ester both refer to monoethyl adipate. In books such as "Tiangong Kaiwu", although there is no corresponding modern chemical terms, according to the ancient people's understanding of chemical substances and processes, it may be related to the preparation and use.
Ancient chemical industry is mostly related to people's livelihood and practicality. If you look at monoethyl adipate from an ancient perspective, it may be related to some lipid processing technologies. In ancient times, there were many methods involving grease and wax treatment to achieve lubrication, anti-corrosion, fragrance and other purposes.
In terms of lubrication purposes, the ancients used lubricating materials to reduce friction in mechanical running parts. Although the exact composition of monoethyl adipate was not known at that time, during the refining process of animal and vegetable oils, substances with similar lubricating properties may be accidentally formed. It may be used in delicate machinery, such as ancient textile machines and astronomical instrument parts, to lubricate the equipment to make the equipment run smoothly and prolong the service life.
In the field of anti-corrosion, the ancients preserved utensils and food, and commonly used lipid coatings. If monoethyl adipate has a certain chemical stability, it can be coated with beeswax and grease like ancient ones to isolate air and water vapor and achieve anti-corrosion effect. For example, wood utensils are coated to prevent their decay; metal utensils are used to slow their corrosion.
In the fragrance making process, the ancients were quite particular about the preparation and molding of fragrances. Monoethyl adipate is used in the production of fragrances because of its special odor or fragrance-enhancing properties. Or to help shape fragrances to make the texture of fragrant pills and cakes better; or to adjust the rate of aroma volatilization when incense is burned, so that the aroma release is more lasting and pleasant.
Although there is no exact ancient record of monoethyl adipate, it can be inferred that it may have potential uses in many practical techniques, reflecting the wisdom of the ancients in exploring and utilizing material properties.
Monoethyl Adipate, Adipic Acid What are the physical properties of Monoethyl Ester
Monoethyl Adipate, that is, monoethyl adipate, the physical properties of this substance are as follows:
Looking at its shape, at room temperature, it is mostly colorless to light yellow liquid, and its color is clear, like lake water in autumn night, without turbidity. Its taste has a special smell, but it is not pungent and intolerable, but a milder and more palpable taste.
When it comes to boiling point, it is usually around 280 ° C under certain pressure conditions. This boiling point state is similar to the boiling of water, and the substance gradually changes from liquid to gaseous state. Its melting point is relatively low, about -20 ° C, that is, the temperature drops to about minus 20 degrees Celsius, and the liquid state condenses into a solid state, just like the freezing of lake water in cold winter.
The density of monoethyl adipate is nearly 1.10 g/cm ³, which is slightly heavier than water. If it is placed in one place with water, it can be seen that it sinks slowly, such as stone entering water. Its solubility is also an important property, and it can be soluble in many organic solvents, such as ethanol and ether. For example, salts dissolve in water and blend seamlessly. However, its solubility in water is relatively limited, and it is partially soluble and not fully soluble.
In addition, its chemical properties are still stable at room temperature and pressure. When exposed to high temperatures, open flames or strong oxidants, it may also trigger a reaction, just like a quiet lake when a boulder is thrown into it, causing waves. These are the main physical properties of monoethyl adipate, and their applications in many fields such as chemical industry depend on these characteristics.
Monoethyl Adipate, Adipic Acid What are the chemical properties of Monoethyl Ester
Monoethyl Adipate is monoethyl adipate, and its physical properties are as follows:
From the perspective of monoethyl adipate, it is a colorless to light yellow oily liquid with a faint odor. Its molecular weight is 174.19, its boiling point is about 286 ° C, and it also has specific performance at 135-137 ° C/1.33kPa. The relative density is about 1.063 (20 ° C), and the refractive index is 1.4390.
In terms of solubility, monoethyl adipate is soluble in organic solvents such as alcohols and ethers, but its solubility in water is quite small.
Chemically, its ester group is active and can react with alcohols, amines, etc. When exposed to acids or bases, it can hydrolyze to produce adipic acid and ethanol. Under appropriate conditions, it can also participate in various reactions such as esterification and aminolysis. Because of its chemical properties, it is often used as an intermediate in the field of organic synthesis to prepare various esters and fine chemicals.
Monoethyl Adipate, Adipic Acid Monoethyl Ester
There are two common methods for preparing monoethyl adipate (Adipic Acid Monoethyl Ester).
First, adipic acid and ethanol are used as raw materials and prepared by esterification reaction. This reaction requires the help of a catalyst, and sulfuric acid, p-toluenesulfonic acid, etc. are commonly used. The process is as follows: place adipic acid and ethanol in an appropriate proportion in the reaction kettle, add an appropriate amount of catalyst, heat and stir. Temperature control is crucial, generally it needs to be maintained near the boiling point of ethanol to keep the reaction system in a slightly boiling state, which can promote the esterification reaction forward. During the reaction, water is continuously generated. In order to shift the equilibrium to the right, azeotropic distillation can be used to remove water. For example, benzene, toluene and other solvents that form azeotrope with water can be added, and water can be taken out of the system by azeotrope. When the reaction reaches the expected level, the temperature is lowered, the catalyst is neutralized in alkali solution, and then the product is purified by water washing and distillation. Monoethyl adipate can be obtained.
Second, it is prepared by reacting adipic anhydride with ethanol. This reaction is relatively mild and does not require a strong acid catalyst. Slowly add adipic anhydride to ethanol and stir the reaction. The reaction process will exothermic, and the feeding speed and reaction temperature need to be controlled to prevent the reaction from being too violent. The reaction activity of adipic anhydride with ethanol is high, After the reaction is completed, pure monoethyl adipate can be obtained by removing unreacted raw materials and impurities through appropriate separation and purification operations, such as vacuum distillation. These two methods have their own advantages and disadvantages. The former raw materials are common and easy to obtain, but the reaction conditions and post-processing steps need to be strictly controlled; the latter reaction conditions are mild, the purity of the product is easy to improve, but the cost of adipic anhydride may be higher. When actually preparing, choose the best according to the specific needs and conditions.
Monoethyl Adipate, Adipic Acid Monoethyl Ester What are the precautions in storage and transportation
Monoethyl Adipate, Adipic Acid Monoethyl Ester is mono-ethyl adipate. Many things need to be paid attention to during storage and transportation.
First, the storage place should be selected in a cool, dry and well-ventilated place. Because if mono-ethyl adipate is heated, or its chemical properties change, and even cause decomposition and other adverse conditions. If it is in a humid environment, it may be deteriorated by moisture, which will affect its quality.
Second, it must be kept away from fires and heat sources. This substance is flammable, and it is very easy to burn in case of open flames and hot topics. Therefore, fireworks are strictly prohibited in storage and transportation sites, and corresponding fire extinguishing facilities and equipment need to be equipped, just in case.
Third, when storing, it should be stored separately from oxidants, acids, alkalis, etc., and must not be mixed. Due to its chemical properties, contact with these substances, or chemical reactions occur, resulting in danger.
Fourth, during transportation, make sure that the container does not leak, collapse, fall, or damage. It is necessary to carefully check whether the packaging is in good condition. If the packaging is damaged, monoethyl adipate leaks, or pollutes the environment, or causes safety accidents.
Fifth, transportation vehicles should be equipped with corresponding varieties and quantities of fire equipment and leakage emergency treatment equipment. In the event of an accident such as a leak on the way, emergency treatment can be carried out in time to reduce the harm.
Sixth, it should be handled lightly to prevent damage to packaging and containers. Rough handling can easily cause packaging to break and cause leakage of monoethyl adipate.
In this way, proper storage and transportation of monoethyl adipate can ensure its quality and safety and avoid accidents.