Solubility of Sulfur Dioxide in a Commercial Hydrocarbon Mixture in the Temperature Range of (303 to 343) K: Effect of Hydrocarbon Composition on Absorption

2012 ◽  
Vol 57 (4) ◽  
pp. 1146-1151 ◽  
Author(s):  
Ahmet Alper Aydın ◽  
Hasancan Okutan
Keyword(s):  
Sulfur Dioxide ◽  
Hydrocarbon Composition ◽  
Hydrocarbon Mixture ◽  
Temperature Range

scholarly journals Gas chromatography using ice-coated fused silica columns: study of adsorption of sulfur dioxide on water ice

2018 ◽  
Vol 18 (10) ◽  
pp. 7527-7537 ◽  
Author(s):  
Stefan Langenberg ◽  
Ulrich Schurath
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Vertical Displacement ◽  
Fused Silica ◽  
Water Ice ◽  
Temperature Range ◽  
Reaction With Water ◽  
The Impact ◽  
Peak Retention Time ◽  
Established Technique

Abstract. The well established technique of gas chromatography is used to investigate interactions of sulfur dioxide with a crystalline ice film in a fused silica wide bore column. Peak shape analysis of SO2 chromatograms measured in the temperature range 205–265 K is applied to extract parameters describing a combination of three processes: (i) physisorption of SO2 at the surface, (ii) dissociative reaction with water and (iii) slow uptake into bulk ice. Process (ii) is described by a dissociative Langmuir isotherm. The pertinent monolayer saturation capacity is found to increase with temperature. The impact of process (iii) on SO2 peak retention time is found to be negligible under our experimental conditions.By analyzing binary chromatograms of hydrophobic n-hexane and hydrophilic acetone, the premelt surface layer is investigated in the temperature range 221–263 K, possibly giving rise to irregular adsorption. Both temperature dependencies fit simple van't Hoff equations as expected for process (i), implying that irregular adsorption of acetone is negligible in the investigated temperature range. Adsorption enthalpies of −45 ± 5 and −23±2 kJ mol−1 are obtained for acetone and n-hexane.The motivation of our study was to assess the vertical displacement of SO2 and acetone in the wake of aircraft by adsorption on ice particles and their subsequent sedimentation. Our results suggest that this transport mechanism is negligible.

scholarly journals Gas-Chromatography using ice coated fused silica-columns: Study of adsorption of sulfur dioxide on water-ice

2017 ◽  
Author(s):  
Stefan Langenberg ◽  
Ulrich Schurath
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Vertical Displacement ◽  
Fused Silica ◽  
Experimental Conditions ◽  
Water Ice ◽  
Temperature Range ◽  
Reaction With Water ◽  
The Impact ◽  
Peak Retention Time

Abstract. The well-established technique of gas chromatography is used to investigate interactions of sulfur dioxide with a crystalline ice film in a fused silica wide-bore column. Peak shape analysis of SO2 chromatograms measured in the temperature range 205–265 K is applied to extract parameters describing a combination of three processes: (i) physisorption of SO2 at the surface; (ii) dissociative reaction with water; (iii) slow uptake into bulk ice. Process (ii) is described by a dissociative Langmuir isotherm. The pertinent monolayer saturation capacity is found to increase with temperature. The impact of process (iii) on SO2 peak retention time is found to be negligible under our experimental conditions. By analyzing binary chromatograms of hydrophobic n-hexane and hydrophilic acetone, the premelt surface layer is probed in the temperature range 221–263 K possibly giving rise to irregular adsorption. Both temperature dependencies fit simple van't Hoff equations as expected for process (i), implying that irregular adsorption of acetone is negligible in the probed temperature range. Adsorption enthalpies of −45 ± 5 kJ mol−1 and −23 ± 2 kJ mol−1 are obtained for acetone and n-hexane. Our study was motivated to assess the vertical displacement of SO2 and acetone in the wake of aircraft by adsorption on ice particles and their subsequent sedimentation. Our results suggest that this transport mechanism is negligible.

scholarly journals Assessment of the Factors Influencing Sulfur Dioxide Emissions in Shandong, China

Atmosphere ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 142
Author(s):  
Huisheng Wu ◽  
Shan Hong ◽  
Maogui Hu ◽  
Yongheng Li ◽  
Wenzheng Yun
Keyword(s):  
Wind Speed ◽  
Sulfur Dioxide ◽  
Influencing Factors ◽  
Secondary Production ◽  
Diurnal Temperature Range ◽  
Meteorological Factors ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Significant Difference ◽  
Soot Emissions

Sulfur dioxide (SO2) is a serious air pollutant emitted from different sources in many developing regions worldwide, where the contribution of different potential influencing factors remains unclear. Using Shandong, a typical industrial province in China as an example, we studied the spatial distribution of SO2 and used geographical detectors to explore its influencing factors. Based on the daily average concentration in Shandong Province from 2014 to 2019, we explored the influence of the diurnal temperature range, secondary production, precipitation, wind speed, soot emission, sunshine duration, and urbanization rate on the SO2 concentration. The results showed that the diurnal temperature range had the largest impact on SO2, with q values of 0.69, followed by secondary production (0.51), precipitation (0.46), and wind speed (0.42). There was no significant difference in the SO2 distribution between pairs of sunshine durations, soot emissions, and urbanization rates. The meteorological factors of precipitation, wind speed, and diurnal temperature range were sensitive to seasonal changes. There were nonlinear enhancement relationships among those meteorological factors to the SO2 pollution. There were obvious geographical differences in the human activity factors of soot emissions, secondary production, and urbanization rates. The amount of SO2 emissions should be adjusted in different seasons considering the varied effect of meteorological factors.

Crystallization and Structural Solidification of Paraffins in Various Solvents

2021 ◽  
Vol 624 (2) ◽  
pp. 25-29
Author(s):  
Е. А. Aleksandrovа ◽  
◽  
B. L. Aleksandrov ◽  
Zh. T. Khadisova ◽  
Kh. Kh. Akhmadova ◽  
...  
Keyword(s):  
Hydrocarbon Composition ◽  
Melting Points ◽  
Temperature Range ◽  
Hydrocarbon Solvents ◽  
Different Origin

The temperatures of the beginning of crystallization and solidification of solutions of petroleum and synthetic paraffins of different concentrations in nonpolar and weakly polar hydrocarbon solvents of different composition and viscosity are studied. It is shown that paraffins of different origin and hydrocarbon composition, with similar melting points, have slightly different crystallization temperatures аnd solidification in this solvent. The temperature range between the temperatures of the beginning of crystallization and solidification of the studied paraffin solutions is established.

Recombination of iodine atoms in sulfur dioxide

1970 ◽  
Vol 48 (13) ◽  
pp. 2133-2134 ◽  
Author(s):  
J. Brown ◽  
G. Burns
Keyword(s):  
Sulfur Dioxide ◽  
Rate Constant ◽  
Recombination Rate ◽  
Supporting Evidence ◽  
Temperature Range ◽  
Ultraviolet Spectra ◽  
Recombination Rate Constant

The reaction 2I + SO2 → I2 + SO2 has been studied between 293 and 668°K. At 293°K, the recombination rate constant is 2.6 × 1010]2 mole−2 s−1; it attains 1/10 of this value at 668°K. Although the infrared and ultraviolet spectra of SO2, studied previously, suggest the existence of two forms of SO2 in the temperature range in question, the present recombination studies present no further supporting evidence about the existence of the excited form.

Effect of temperature on the spectrum of sulfur dioxide

1969 ◽  
Vol 47 (22) ◽  
pp. 4291-4292 ◽  
Author(s):  
J. Brown ◽  
George Burns
Keyword(s):  
Excited State ◽  
Sulfur Dioxide ◽  
Equilibrium Constant ◽  
Enthalpy Change ◽  
Ultraviolet Spectrum ◽  
Effect Of Temperature ◽  
Isomeric Form ◽  
Kcal Mole ◽  
Temperature Range

The effect of temperature on the ultraviolet spectrum of sulfur dioxide has been studied over the temperature range 20 to 1000 °C. The equilibrium constant for the reaction[Formula: see text]where (SO2) is an isomeric form or an excited state of sulfur dioxide, has been obtained at several temperatures. The enthalpy change for the transition was found to be 4.1 ± 0.4 kcal mole−1.

scholarly journals Virtual Soft Sensor of the Feedstock Composition of the Catalytic Reforming Unit

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1233
Author(s):  
Natalia Koteleva ◽  
Ilya Tkachev
Keyword(s):  
Group Composition ◽  
Fractional Composition ◽  
Hydrocarbon Composition ◽  
Gasoline Fraction ◽  
Soft Sensor ◽  
Oil Refinery ◽  
Hydrocarbon Mixture ◽  
Catalytic Reforming ◽  
The Individual ◽  
Individual Composition

The paper discusses a method for obtaining a matrix of individual and group composition of a hydrotreated heavy gasoline fraction in industrial conditions based on the fractional composition obtained by the distillation method according to the ASTM D86 (the Russian analogue of such a standard is GOST 2177). A method for bounds estimation of the retention index (RI) change is considered on the basis of the symmetry of the RI change range relative to its arithmetic mean. Implementation of this method is performed by simulation of individual composition of C6–C12 feedstock of the catalytic reforming unit in the software package. For this purpose, the boiling curve of individual composition of hydrocarbon mixture is converted into the corresponding curve of fractional composition. The presented technique of creating a virtual soft sensor makes it possible to establish a correct relationship between the fractional composition and the individual hydrocarbon composition obtained according to the IFP 9301 (GOST R 52714) (Russian GOST R 52714 and international IFP 9301 standards for the determination of individual and group composition of hydrocarbon mixtures by capillary gas chromatography). The virtual soft sensor is based on chemical and mathematical principles. The application of this technique on the data of a real oil refinery is shown. Obtaining accurate data by means of a virtual soft sensor on the individual composition of feedstock will make it possible to optimize the catalytic reforming process and thus indirectly improve its environmental friendliness and enrichment efficiency.

Sign in / Sign up

Export Citation Format

Share Document