Acrylic acid Molecular formula C3H4O2, molecular weight 72.06. Colorless liquid, pungent odor, corrosive, and strong acidity. Soluble in water, ethanol and ether, but also soluble in benzene, acetone, chloroform, etc. The melting point is 13.5°C, the boiling point is 140.9°C, and the density (20/4°C) is 1.0611g/cm3. The chemical nature is lively. It is easy to polymerize in air and can be reduced to propionic acid by hydrogenation. Addition with hydrogen chloride generates 2-chloropropionic acid. Used in the preparation of acrylic resins and other organic synthesis. It is made by oxidation of acrolein or hydrolysis of acrylonitrile, or made by carbon monoxide, acetylene and water under the action of nickel catalyst.
Main purpose
The hydrogens at the α and β positions of this product are easily substituted, and the carboxyl group can generate esters, amides, acid chlorides, acid anhydrides, etc.; its double bonds have the same properties as double bonds, are chemically active, and can be homopolymerized and copolymerized. The polymer is very useful It is a wide range of important chemical raw materials; this product and its esters can be used as polymer monomers; in addition, it can also be used as raw materials for adhesives, coatings, resins, etc.; resins synthesized from this product can be used separately Pharmaceutical, leather, textile, paper, chemical fiber, rubber, building materials, plastics, packaging materials, water treatment, oil exploration and other industries.
Physical and chemical properties
Colorless liquid. Strong organic acid. It has a pungent sour taste and produces smoke. Below the melting point, it becomes a needle-like crystal. The relative molecular mass is 72.06. The relative density is 1.0511. The melting point is 13.5°C. Boiling point: 141.6℃, 122℃(53.329×103Pa), 103.3℃(26.664×103Pa), 86.1℃(13.332×103Pa), 66.2℃(5.333×103Pa), 48.5℃(2.000×103Pa), 39℃(1.333×103Pa) ), 27.3°C (0.667×103Pa). The flash point is 68.3°C. The refractive index is 1.4224. It is soluble in acetone, benzene, and miscible with water, ethanol and ether. It is corrosive, chemically active, unstable, and easy to polymerize when exposed to oxygen. Polymerization inhibitors such as hydroquinone or methoxyhydroquinone can be added during storage.
Toxicity
The smoke is irritating to the eyes and nasal mucosa, and it is corrosive and irritating to the skin when it touches the skin. Please pay attention to it during operation.