Chemical and Physical Properties of Sulphur Dioxide and Sulphur Trioxide

2015 ◽  
pp. 9-19 ◽  
Author(s):  
Navin G. Ashar
Keyword(s):  
Physical Properties ◽  
Sulphur Dioxide ◽  
Sulphur Trioxide

The absorption spectrum of SO and the flash photolysis of sulphur dioxide and sulphur trioxide

1959 ◽  
Vol 249 (1259) ◽  
pp. 498-512 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Dissociation Energy ◽  
Sulphur Dioxide ◽  
Flash Photolysis ◽  
Ultra Violet ◽  
Vibrationally Excited ◽  
A Value ◽  
Continuous Absorption ◽  
Sulphur Trioxide ◽  
Normal Spectrum

The flash photolysis of sulphur dioxide under adiabatic conditions results in the complete temporary disappearance of its spectrum , which then slowly regains its original intensity over a period of several milliseconds. Simultaneously with the disappearance of the sulphur dioxide spectrum a continuous absorption appears in the far ultra-violet and fades slowly as the sulphur dioxide reappears. It is shown that the effect of the flash is thermal rather than photochemical, and the possibility of the existence of an isomer of sulphur dioxide at high temperatures is discussed; the disappearance of the normal spectrum on flashing is explained in this way. Several previously unrecorded bands of SO observed in the photolysis indicate that the vibrational numbering of its spectrum should be revised by the addition of 2 to the present values of v' . This leads to a value of the dissociation energy of 123.5 kcal. In formation about the levels v' = 4, 5 and 6 has also been obtained. The isothermal flash photolysis of sulphur trioxide results in the appearance of vibrationally excited SO, and the primary photochemical step in this reaction is discussed.

scholarly journals Reaction Mechanism of Formation of CaSO4 in AFBC

1970 ◽  
Vol 41 (3) ◽  
pp. 167-170
Author(s):  
Ismat Ali ◽  
M Mohsin Ali
Keyword(s):  
Reaction Mechanism ◽  
Nitrogen Content ◽  
Fluidized Bed ◽  
Sulphur Dioxide ◽  
Calcium Sulphate ◽  
Mechanism Of Formation ◽  
Sulphur Trioxide ◽  
Fluidized Bed Combustor

Attempts have been made to investigate and predict the reaction mechanism of formation of calcium sulphate (CaSO4) in Atmospheric Fluidized Bed Combustor (AFBC). Formation of NOx, from nitrogen content to coal has been found beneficial for the oxidation of sulphur dioxide to sulphur trioxide. Bangladesh J. Sci. Ind. Res. 41(3-4), 167-170, 2006

scholarly journals On the refractive indices of gaseous nitric oxide, sulphur dioxide, and sulphur trioxide

1908 ◽  
Vol 80 (540) ◽  
pp. 406-410 ◽  
Keyword(s):  
Nitric Oxide ◽  
White Light ◽  
Sulphur Dioxide ◽  
Ferrous Sulphate ◽  
Refractive Indices ◽  
Sulphur Trioxide

Dufet only records two determinations of the index of nitric oxide: that of Dulong, who found 1.000302 for white light, and that of Mascart, who gives, for sodium light, 1.0002975, taking air as 1.0002928. The latter states that the gas he used contained about 10 per cent, of gas not absorbable by ferrous sulphate, for which allowance was made; but the analysis was not very accurate. As the index is abnormally high, and methods of purifying gases have improved since 1877, it seemed desirable to repeat the determination.

THE RAMAN SPECTRA OF LIQUID SULPHUR TRIOXIDE AND SOLUTIONS OF SULPHUR TRIOXIDE IN INERT SOLVENTS

1961 ◽  
Vol 39 (11) ◽  
pp. 2189-2200 ◽  
Author(s):  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Carbon Tetrachloride ◽  
Raman Spectra ◽  
Sulphur Dioxide ◽  
Monomeric Form ◽  
Polymeric Form ◽  
Cyclic Trimer ◽  
Low Concentrations ◽  
Polymeric Species ◽  
Liquid Sulphur ◽  
Sulphur Trioxide

The Raman spectra of liquid sulphur trioxide and of sulphur trioxide dissolved in a number of "inert" solvents have been investigated. A detailed analysis of the spectrum of liquid sulphur trioxide supports the earlier suggestion of Gerding and Nijveld that the main polymeric species in liquid sulphur trioxide is the cyclic trimer. Frequencies are assigned for all the Raman active vibrations of the cyclic trimer. These assignments differ substantially from those given previously by Gerding and Nijveld.The spectra of dilute solutions of sulphur trioxide in sulphur dioxide, sulphuryl chloride, carbon tetrachloride, tetrachlorethylene, and trichlorfluormethane (Freon 11) show that the sulphur trioxide is present mainly in the monomeric form at low concentrations while at higher concentrations a polymeric form, which is very probably the trimer, is also present.

Donor-acceptor complexes of trimethylamine with selenium trioxide, sulphur trioxide, and sulphur dioxide

1981 ◽  
Vol 46 (11) ◽  
pp. 2600-2612 ◽  
Author(s):  
Jiří Toužín ◽  
Petr Bauer
Keyword(s):  
Sulphur Dioxide ◽  
Conductometric Titration ◽  
Normal Coordinate ◽  
Vibration Spectra ◽  
Compound C ◽  
Donor Acceptor ◽  
Important Intermediate ◽  
Structural Analogy ◽  
Sulphur Trioxide

Study of reaction course of trimethylamine with selenium trioxide by conductometric titration and vibration spectra of the products proved that the reaction produces, besides the known donor-acceptor complex (CH3)3N.SeO3, also the adduct (CH3)3N.S2O6 similar to that formed in the system pyridine-selenium trioxide. Although the latter adduct could not be isolated in pure state, the results obtained indicate its structural analogy to the compound C5H5N.Se2O6. In preparation of the both DA complexes of selenium trioxide and trimethylamine the adduct (CH3)3N.SO2 is an important intermediate whose vibration spectra were measured and interpreted, too. Comparison and characterization of bonding relations in the DA complexes (CH3)3N.SeO3 and (CH3)3N.SO3 were carried out on the basis of results of normal coordinate analysis.

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