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Sulfur dioxide is an intermediate in the production of sulfuric acid, being converted to sulfur trioxide, and then to oleum, which is made into sulfuric acid. Sulfur dioxide for this purpose is made when sulfur combines with oxygen. The method of converting sulfur dioxide to sulfuric acid is called the contact process. Several million tons are ...
The two principal sulfur oxides are obtained by burning sulfur: S + O 2 → SO 2 (sulfur dioxide) 2 SO 2 + O 2 → 2 SO 3 (sulfur trioxide). Many other sulfur oxides are observed including the sulfur-rich oxides include sulfur monoxide, disulfur monoxide, disulfur dioxides, and higher oxides containing peroxo groups.
The sulfur dioxide is oxidized to sulfur trioxide by oxygen in the presence of a vanadium(V) oxide catalyst. This reaction is reversible and the formation of the sulfur trioxide is exothermic. 2 SO 2 + O 2 ⇌ 2 SO 3. The sulfur trioxide is absorbed into 97–98% H 2 SO 4 to form oleum (H 2 S 2 O 7), also known as fuming sulfuric acid or ...
For levels up to 75 mg/L chlorine is used in the purification process as an oxidizing chemical to react with hydrogen sulfide. This reaction yields insoluble solid sulfur. Usually the chlorine used is in the form of sodium hypochlorite. [55] Aeration For concentrations of hydrogen sulfide less than 2 mg/L aeration is an ideal treatment process ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 21 February 2025. This article is about the chemical element. For other uses, see Sulfur (disambiguation). Chemical element with atomic number 16 (S) Sulfur, 16 S Sulfur Alternative name Sulphur (pre-1992 British spelling) Allotropes see Allotropes of sulfur Appearance Lemon yellow sintered microcrystals ...
Sulfur dioxide (SO 2), a colorless gas with a pungent smell Sulfonyl group (R-SO 2-R), a functional group found primarily in sulfones, or a substituent; SO(2), special orthogonal group of degree 2 in mathematics; Oxygen saturation (SO 2), the concentration of oxygen dissolved in a medium
Sulfuric(IV) acid (United Kingdom spelling: sulphuric(IV) acid), also known as sulfurous (UK: sulphurous) acid and thionic acid, [citation needed] is the chemical compound with the formula H 2 SO 3. Raman spectra of solutions of sulfur dioxide in water show only signals due to the SO 2 molecule and the bisulfite ion, HSO − 3. [2]
A chemical substance is a unique form of matter with constant chemical composition and characteristic properties. [1] [2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture. [3]