Techno Economic Evaluation of Processes Involved to Manufacture Liquid Sulphur Dioxide and Liquid Sulphur Trioxide

2015 ◽  
pp. 41-44
Author(s):  
Navin G. Ashar
Keyword(s):  
Economic Evaluation ◽  
Sulphur Dioxide ◽  
Liquid Sulphur ◽  
Sulphur Trioxide

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.

Dicyclohexanecarbonylsulphate: a precursor of cyclohexyloxocarbenium ions

1977 ◽  
Vol 55 (2) ◽  
pp. 355-359 ◽  
Author(s):  
E. Montoneri ◽  
L. Giuffré ◽  
M. Cassago ◽  
E. Tempesti ◽  
M. Fornaroli
Keyword(s):  
Low Temperature ◽  
Sulphur Dioxide ◽  
Liquid Sulphur ◽  
Sulphur Trioxide ◽  
Equimolar Solution

Dicyclohexanecarbonyl sulphate (1) is the prevailing species in the equimolar solution of cyclohexanecarboxylic anhydride and sulphur trioxide in liquid sulphur dioxide. The ionization of 1 to cyclohexyloxocarbenium ions occurs only in the presence of excess sulphur trioxide. Both 1 and C6H11CO+ are stable only in solution and at low temperature.

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

Formation of Radical Intermediates in Sulphur Dioxide Solutions of Tertiary Aliphatic Amines

1974 ◽  
Vol 29 (11-12) ◽  
pp. 742-749 ◽  
Author(s):  
M. H. Donbavand ◽  
H. J. Möckel
Keyword(s):  
Sulphur Dioxide ◽  
Free Radical Oxidation ◽  
Molecular Iodine ◽  
Coupling Constants ◽  
Aliphatic Amines ◽  
Stable Free Radical ◽  
Radical Oxidation ◽  
Radical Intermediates ◽  
Alkyl Groups ◽  
Liquid Sulphur

The addition of molecular iodine to solutions of tertiary aliphatic amines in liquid sulphur dioxide is found to result in the formation of stable free radical oxidation intermediates. In triethylamine solutions, oxidised under these conditions, aromatisation appears to take place to produce a pyridinyl radical. Radicals formed from N-ethyldimethylamine, Ν,Ν-diethylmethylamine and tri-n-propylamine on the other hand appear to be essentially aliphatic in character, with two of the N-alkyl groups intact. The magnitude of the measured coupling constants however, implies some delocalisation in the “damaged” alkyl group, possibly via a tautomeric mechanism. A number of mechanistic possibilities are explored to account for the roles played by iodine and sulphur dioxide in these reactions.

Inelastic neutron and light scattering studies on liquid sulphur dioxide

1993 ◽  
Vol 78 (4) ◽  
pp. 821-836 ◽  
Author(s):  
A. Chahid ◽  
M. García-Hernández ◽  
C. Prieto ◽  
F.J. Bermejo ◽  
E. Enciso ◽  
...  
Keyword(s):  
Light Scattering ◽  
Sulphur Dioxide ◽  
Inelastic Neutron ◽  
Liquid Sulphur
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