What does desulfurization mean?
Desulfurization is the process of removing sulfur or sulfur compounds from materials — most commonly fossil fuels such as coal, crude oil, and natural gas, but also waste gases produced when they are burned. Because sulfur oxides released into the atmosphere cause acid rain and respiratory illness, desulfurization is central to modern environmental regulation. In refineries, techniques such as hydrodesulfurization use hydrogen and catalysts to strip sulfur from fuel fractions; at power plants, flue-gas desulfurization passes exhaust through an alkaline slurry, often of limestone, that absorbs sulfur dioxide before it can escape. The word is technical in register, appearing mainly in chemistry, engineering, and policy contexts, and is spelled 'desulphurization' in British English. It derives ultimately from Latin sulphur combined with the prefix de-, meaning removal.
nounThe process of removing sulfur or sulfur compounds from a substance, such as coal, petroleum, natural gas, or flue gases. It is chiefly an industrial and chemical term associated with reducing sulfur emissions.
- The industrial removal of sulfur or sulfur compounds from fuels such as coal, petroleum, and natural gas, typically to reduce emissions or protect catalysts.
- The chemical treatment of flue gases (especially via scrubbers) to strip sulfur dioxide before it is released into the atmosphere.
"Modern refineries rely on desulfurization to meet strict regulations on the sulfur content of diesel fuel."
"Hydrodesulfurization removes sulfur from crude oil fractions by reacting them with hydrogen over a catalyst."
"The power plant installed a flue-gas desulfurization unit, cutting its sulfur dioxide emissions by more than ninety percent."
Rarely plural; the uncountable singular is standard even when referring to multiple processes, though the plural appears occasionally when contrasting different methods.
"Various desulfurizations were tested before the plant settled on wet limestone scrubbing."
Flue-gas desulfurization — scrubbing sulfur out of power-plant smoke using limestone slurry — is a major reason acid rain has faded from the headlines since the 1980s.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of desulfurization
Desulfurization combines the prefix de- (indicating removal) with sulfur, whose name traces back through French soufre to Latin sulphur, plus the noun-forming suffix -ization. The compound arose in the nineteenth century alongside the growth of industrial chemistry as scientists developed methods to remove sulfur from fuels and ores. The related verb desulfurize and the adjective desulfurized follow the same pattern, and the root sulfur also underlies words such as sulfate, sulfide, and sulfurous.
Related word forms
How desulfurization is actually used
A technical term used mainly in chemistry, petrochemical engineering, and environmental regulation. British spelling is 'desulphurization'; American spelling is 'desulfurization'. The verb form is 'desulfurize' and the adjectival form 'desulfurized' (as in 'desulfurized fuel').
Easily confused with desulfurization
Desulfurization specifically removes sulfur or its compounds, whereas decontamination is the broader removal of any harmful contaminants.