1,11-Undecanediol

1,11-undecanediol has a wide range of uses. In the chemical industry, it is an important raw material for the preparation of polyester, polyether and polyurethane. Taking polyester as an example, after polycondensation reaction with polyacid, the polyester is used in coatings, fibers and engineering plastics. In coatings, the coating is given good wear resistance and chemical resistance; in the fiber field, it can improve the performance of fibers and make them more durable. In the fragrance industry, 1,11-undecanediol also plays an important role. It can be chemically converted into fragrance compounds with unique aromas, adding a unique flavor to perfumes, flavors and other products, creating a fascinating olfactory experience. In the field of medicine, this compound has also shown potential uses. It can be used as an intermediate in drug synthesis, participating in the preparation process of various drugs, providing a key basic substance for pharmaceutical research and development, and assisting the creation of new drugs to meet medical needs. In addition, in the preparation of lubricants and surfactants, 1,11-undecanediol can also play a role. Its molecular structure properties can improve the performance of lubricants, enhance lubrication effects, and reduce friction losses. In the preparation of surfactants, it affects the surfactant's surfactant activity and emulsification properties, enabling it to be used in many scenarios in industrial production and daily life, such as the manufacture of detergents, cosmetics, and other products.

1,11-Undecanediol is an organic compound. It has unique physical properties and is listed below: - ** Properties **: Under normal conditions, this substance is a white to slightly yellow crystalline solid, with a delicate appearance and a warm touch. It looks like frost and snow, and it is as cold as fat jade. - ** Melting point **: About 72-74 ° C. When heated to this point, if ice disappears in the warm sun, its lattice structure gradually disintegrates, and it slowly melts from the solid state into a liquid state, just like the earth in spring, and ice and snow melt. - ** Boiling point **: Boils at 308-310 ° C. At this high temperature, the molecular heat movement is intense, breaking free from the liquid phase, and turning into a gaseous rise, just like Kunpeng spreading its wings and skyrocketing. - ** Solubility **: Slightly soluble in water, this is because its molecular structure is dominated by hydrophobic alkyl long chains, so it is difficult to blend with hydrophilic water molecules, just like the mutual exclusion of oil and water. However, it is soluble in organic solvents such as ethanol and ether, just like the water obtained by fish, because the non-polar environment of these organic solvents is compatible with part of the structure of 1,11-undecanediol, and the two are soluble to form a uniform system. - ** Density **: about 0.975g/cm ³, slightly lighter than water, if placed in water, it seems to float on the blue waves and leisurely on it. - ** Odor **: Almost odorless, like the orchid of an empty valley, elegant but not pungent, does not disturb people's sense of smell, quiet and safe. These physical properties make 1,11-undecanediol widely used in many fields such as chemicals and materials, and contribute greatly to the development of industry and the improvement of materials.

The synthesis of 1,11-undecanediol can follow the following steps. The starting material is selected from a suitable carbon-containing compound, such as undecanoic acid and its derivatives. First, the undecanoic acid is esterified to obtain the corresponding ester. This step involves co-heating of alcohols and acids under the action of catalysts to esterize. Common catalysts include sulfuric acid, etc. The reaction temperature should be suitable, about 80-120 ° C. The reaction time depends on the situation, about several hours, so that the reaction can be fully carried out to obtain a higher yield ester. Then, the resulting ester is hydrogenated. In a suitable reaction device, a palladium-carbon catalyst is used as a catalyst, hydrogen is introduced, and the carbon-carbon double bond is hydrogenated at a certain pressure and temperature. The pressure is about 1-5 atm, and the temperature is about 50-100 ° C. The saturated ester can be obtained through this step. Finally, the saturated ester is hydrolyzed. The alkali solution such as sodium hydroxide or potassium hydroxide is co-heated with the ester, and the hydrolysis conditions are about 80-100 ° C for several hours. The ester bond is broken to form 1,11-undecanediol and the corresponding carboxylate. After that, it is neutralized with acid, separated and purified to obtain pure 1,11-undecanediol. Another way can be started from haloundecane. Haloundecane is reacted with diol salts, such as sodium ethylene glycol, etc., through nucleophilic substitution reaction, in a suitable organic solvent, heating reaction, so that halogen atoms are replaced by hydroxyl groups, and gradually synthesize 1,11-undecanediol. After the reaction is completed, the product is separated and purified by extraction, distillation and other means to obtain the target compound 1,11-undecanediol.

1% 2C11-undecanediol, all matters need to be treated with caution during storage and transportation. First, it is related to storage. This substance should be placed in a cool, dry and well-ventilated place. If it is placed in a high temperature and humid place, it may cause deterioration. High temperature can cause its melting point to decrease, or cause the appearance of melt adhesion; humid environment can easily make it absorb moisture, affecting purity and quality. For example, in summer heat, if the warehouse does not have cooling and dehumidification equipment, the substance may change its current properties. Second, when it comes to packaging. It needs to be packed in a tightly sealed container to prevent excessive contact with air. Because of its certain chemical activity, it is exposed to the air for a long time, or reacts with oxygen and other ingredients, resulting in changes in properties. And the packaging material must also be suitable, and corrosion-resistant ones that do not react with the substance, such as specific plastic or glass materials, should be selected to ensure its stability. Third, when transporting, there are also many precautions. It is necessary to avoid violent vibration and collision, otherwise the package will be damaged and the substance will leak, which will not only damage the goods, but also endanger the transporter and the surrounding environment. And the environmental conditions of the transportation vehicle should also be controlled to maintain suitable temperature and humidity. If transporting across regions, the climate varies greatly, and the transportation conditions need to be adjusted according to the actual situation to ensure that 1% 2C11-undecanediol is safe throughout the transportation.

1% 2C11-undecanediol, which is related to safety risks, has the following ends. Although this substance is often used in chemical and other fields, it also poses potential risks. It may cause some irritation in skin contact. If it accidentally touches the skin, it may appear slightly red, swollen and itchy. Therefore, when operating, use appropriate protective gear, such as gloves, to avoid direct contact. As for eye contact, it is even more harmful. It may cause severe eye pain, redness and swelling, and even damage vision. If it accidentally enters the eyes, it must be washed with plenty of water immediately and seek medical attention immediately. The risk of inhalation should not be underestimated. In the place of production or use, if its volatiles enter the respiratory tract, or cause cough, asthma and other discomfort. The place should be well ventilated to prevent inhalation. In addition, the flammability of 1% 2C11-undecanediol also needs to be paid attention to. Although it is not extremely flammable, there is still a risk of fire in case of open flames and hot topics. Storage and use should be kept away from fire and heat sources and properly placed. In addition, it may also have an impact on the environment. Although relevant research is not complete, in order to protect the ecology, the waste after use should not be discarded at will. It should be disposed of in accordance with regulations to avoid pollution and soil. In short, those who use this product must be aware of its properties and take precautions to ensure safety.