Thermodynamics of sulphur vapour

Rau, Hans; Kutty, T.R.N.; Carvalho, J.R.F. Guedes de

doi:10.1016/s0021-9614(73)80045-x

Cited by 177 publications

(110 citation statements)

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“…Preliminary results have already been reported [2 -4], and we present in this paper results about the composition of the vapor at various temperatures and pressures. We will attempt to compare these results with a thermodynamic model presented by Rau et al [5]. Up to about 800 K saturated sulfur vapor basically consists of S8' S7, and S6 molecules while smaller species like S5, S4, S3, and S2 begin to playa significant role at higher temperatures only.…”

Section: Pcmentioning

confidence: 89%

“…Hence, the molar fractions X; can be calculated from the following set of equations: Mol fractions x of the different molecular species in saturated sulfur vapor as calculated from Rau's model [5] to follow its composition by Raman spectroscopy. Preliminary results have already been reported [2 -4], and we present in this paper results about the composition of the vapor at various temperatures and pressures.…”

Section: Pcmentioning

confidence: 99%

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Raman Spectrometric Study of the Composition of Sulfur Vapor at Temperatures up to 700°C

Lenain

Picquenard

Corset

et al. 1988

Ber Bunsenges Phys Chem

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Sulfur vapor has been investigated by Raman spectroscopy in a wide temperature and pressure range (300 to 900°C, 0.05 to 0.5 MPa for overheated vapor and 0.007 to 1.65 MPa for saturated vapor). At least eight different species have been observed through their characteristic Raman lines. Well separated Raman lines have been selected for the observation of the change in vapor composition with temperature: symmetrical bending modes for the cyclic species Sg, S7, and S6 and stretching modes for the chain-like species SJ and S2. There are indications for the presence of two conformational isomers of S4, and in addition a new species has been discovered by its resonance Raman line at 635 em -1 which is tentatively assigned to chain-like molecules S. (n > 4) of helical conformation. Several relationships between the thermodynamic properties of the vapor and the Raman measurements are proposed, e.g., the determination of the temperature at which the molar fraction Xi is maximum for the overheated vapor at constant pressure; estimation of the x.lx; ratios using solution measurements of the Raman cross section for the molecules Sg, S7, S6. A careful comparison of these results with the values deduced from Rau's model results in good agreement for the behavior of most of the species apart from S7 which is underestimated in Rau's model. S7 is the dominating species in saturated sulfur vapor above 600 K until S2 takes over at ca. 1000 K.

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Section: Pcmentioning

confidence: 89%

Section: Pcmentioning

confidence: 99%

Raman Spectrometric Study of the Composition of Sulfur Vapor at Temperatures up to 700°C

Lenain

Picquenard

Corset

et al. 1988

Ber Bunsenges Phys Chem

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“…which should be used in Equations (3) and (4). The calculated values differ mostly from the measured ones by less then one per cent; the highest deviations of about 4% occur at the highest pressures close to the saturation line (compare Figs.…”

mentioning

confidence: 84%

Equation of State for the Vapour of Concentrated and Diluted Hydrochloric Acid

Kindler

Wüster

Ran

1978

Ber Bunsenges Phys Chem

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Pressure-volume-temperature relations have been measured for hydrochloric acid with mole fractions of HCI up to 0.23 at temperatures up to 780 K and pressures up to 150 bar. A simplified Redlich-Kwong equation was fitted to the results and is able to describe the behaviour in the single-(vapour-) phase region fairly well(mostly ± 1%). The saturation line is also given as a function oftemperature and mole fraction ofHCI.An Salzsiiure mit HCI-Molenbriichen bis 0,23 wurde das pVT-Verhalten bis 780K und 150bar gemessen. An die Ergebnisse wurde eine vereinfachte Redlich-Kwong-Gleichung angepa13t, die das Verhalten im einphasigen (gasforrnigen) Bereich ziemlich gut (rneistens ±1%) wiedergibt. Au13erdem wird die Siittigungslinie als Funktion von Temperatur und Molenbruch an HCI gegeben.

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“…Gas components in the reaction system were CH,, CO, COS, CO,, CS, , H, , H,O, H,S, SO, and S, . Although the sulfbr actually consisted of various allotropes (Kaloidas et al, 1987 andRau et al, 1973), only S, was considered in the simulation due to the fact that this approximation proved to be very close to the sum of all allotropes.…”

Section: Reaction System and Assumptionsmentioning

confidence: 99%