A brief introduction of liquid sulfur trioxide
2020-03-09
liquid sulfur trioxideAlso known as sulfuric anhydride, sulfur is a high-valent oxide, one of the products of the sulfuric acid industry. It is a colorless liquid at normal pressure and room temperature, and the boiling point is44.8C. Strong smoke in the atmosphere, the formation of sulfuric acid mist difficult to settle. An unusually violent reaction with water produces sulfuric acid, accompanied by acid mist, and releases a large amount of heat.SO3Dissolved in100%Sulfuric acid produces fuming sulfuric acid. SO3 is a monomer when in the gaseous state, a monomer and a trimer when in the liquid state(SO3)3In equilibrium, the higher the temperature, the less trimers will be.
liquid sulfur trioxideThere are three allotropes: α type, β type and γ type. Their melting points are also different. The melting point of α type is62C, the melting point of the beta type is32.5C, the melting point of the gamma type is16.8Celsius, boiling point45C. The normal sulfur trioxide mixture melting point is unstable. It is generally considered to be liquid at room temperature.
SO3 is a monomer in the gaseous state, and is planar triangular in molecular shape, with the sulfur atom centered and apparently characterized by a double bond, in which the sulfur atom is sp2 hybridized. In the liquid state, monomers and trimers3In a balanced state. Solid SO3 exists in two forms, one is fibrousnThe second is a trimer in an ice-like state.3.
liquid sulfur trioxideIf dissolved in water, it is sulfuric acid, and if dissolved in concentrated sulfuric acid, it is fuming sulfuric acid, which will dissolve a large amount of heat release. The corrosion is weak but the oxidation is very strong. It is used to make sulfuric acid and chlorosulfonic acid, and can also be used for organic sulfonation. It is produced by the catalytic oxidation of sulfur dioxide, but its gaseous form is a very serious pollutant and is one of the main sources of acid rain.
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