7783-05-3 Usage
Description
Pyrosulfuric acid, also known as disulfuric acid, is a strong acid with the molecular formula H2S2O7. The sulfur atom in this compound is in the +5 oxidation state. It is a major constituent of fuming sulfuric acid, also known as "oleum," and can be described by the formula ySO3·H2O, where y represents the total molar sulfur trioxide content. Pyrosulfuric acid can also be represented by the formula H2SO4·xSO3 and is a minor constituent of liquid anhydrous sulfuric acid due to the equilibria H2O + SO3 → H2SO4 + SO3 → H2S2O7. It is prepared by reacting excess SO3 with sulfuric acid, resulting in the formation of H2S2O7. An alternative IUPAC name for pyrosulfuric acid is (sulfo-oxy)sulfonic acid.
Uses
1. Used in Chemical Synthesis:
Pyrosulfuric acid is used as a reagent in various chemical synthesis processes for its strong acidic properties and ability to protonate sulfuric acid in anhydrous sulfuric acid solvent systems.
2. Used in Petroleum Industry:
In the petroleum industry, pyrosulfuric acid is used as a catalyst in the alkylation process to produce high-octane gasoline components. Its strong acidity helps in the formation of desired products by promoting the reaction between olefins and isobutane.
3. Used in Production of Dyes and Pigments:
Pyrosulfuric acid is utilized in the production of certain dyes and pigments due to its strong oxidizing and acidic properties, which aid in the synthesis of complex organic compounds.
4. Used in Metal Processing:
In metal processing, pyrosulfuric acid is employed for the purification of metals and the extraction of impurities. Its strong acidic nature helps dissolve metal oxides and other contaminants, resulting in the production of high-purity metals.
5. Used in Pharmaceutical Industry:
Pyrosulfuric acid is used in the pharmaceutical industry for the synthesis of certain drugs and active pharmaceutical ingredients. Its strong acidic properties enable the formation of specific chemical bonds and the synthesis of complex organic molecules.
6. Used in Environmental Applications:
Pyrosulfuric acid can be employed in environmental applications, such as the treatment of wastewater and the removal of pollutants. Its strong oxidizing and acidic properties help break down contaminants and facilitate their removal from water systems.
7. Used in Analytical Chemistry:
In analytical chemistry, pyrosulfuric acid is used as a titrant in various titration methods to determine the concentration of different substances. Its strong acidic nature allows for accurate and precise measurements in analytical processes.
Check Digit Verification of cas no
The CAS Registry Mumber 7783-05-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 7783-05:
(6*7)+(5*7)+(4*8)+(3*3)+(2*0)+(1*5)=123
123 % 10 = 3
So 7783-05-3 is a valid CAS Registry Number.
InChI:InChI=1/H2O7S2/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6)
7783-05-3Relevant articles and documents
FTIR and computational studies of pure and water containing SO3 species in solid argon matrices
Givan, Aharon,Loewenschuss, Aharon,Nielsen, Claus J.,Rozenberg, Mark
, p. 21 - 34 (2007/10/03)
The FT infrared spectrum in the 4000-400 cm-1 range of SO3 vapors, matrix isolated in argon and in water doped argon solid layers, is reported. Vibrational bands are assigned to pure SO3 monomeric and polymeric species and to SO3?H2O complexes, on the basis of theoretical B3LYP and MP2 calculations employing the aug-cc-pVTZ basis sets. The spectroscopic evidence suggests that in addition to the monomer, both the dimeric and the cyclic trimeric (SO3)n complexes are the only other SO3 forms present in the matrix. The spectra also indicate the presence of the 1:1 and the 1:2 SO3·H2O complexes as well as traces of H2S2O7 and water complexed H2SO4, but no evidence for a stable 2:1 SO3?H2O complex was found. The occurrence of the various species is discussed in the light of their calculated energies.
