In chemistry, disulfate or pyrosulfate is the
anion with the molecular formula . Disulfate is the IUPAC name.
It has a
dichromate-like structure and can be visualised as two corner-sharing SO
4 tetrahedra, with a bridging oxygen atom.
[ ]
In this anion, sulfur has an
oxidation state of +6. Disulfate is the
conjugate base of the hydrogen disulfate (hydrogen pyrosulfate) ion , which in turn is the conjugate base of
disulfuric acid
Disulfuric acid (alternative spelling disulphuric acid) or pyrosulfuric acid (alternative spelling pyrosulphuric acid), also named oleum, is a sulfur oxoacid. It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists e ...
(pyrosulfuric acid).
Role in sulfation
Industrial production of
sulfate ester-based surfactants involves the reaction (
sulfation) of
fatty alcohols with
sulfur trioxide. For example,
dodecyl alcohol is sulfated using
sulfur trioxide. The reaction proceeds by initial formation of the pyrosulfate:
:
:
Several million tons are produced annually.
See also
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Potassium pyrosulfate
Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7.
Production
Potassium pyrosulfate is obtained by the thermal decomposition of other salts, most directly from potassium bisulfate:
: 2 KHSO4 ...
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Sodium pyrosulfate
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Pyrophosphate
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Pyrocarbonate
References
{{reflist
Sulfur oxyanions