THERMAL RADIATION COEFFICIENTS OF GASEOUS HYDROCARBONS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
2.
Kazan National Research Technological University
3.
KNITU
4.
Kazan National Research Technological University
(Department of Processes and Devices of Chemical Technologies, Laboratory assistant)
employee from 01.01.2025 until now
Kazan State Technological University
student from 01.01.2023 until now
Kazan, Kazan, Russian Federation
employee from 01.01.2025 until now
Kazan State Technological University
student from 01.01.2023 until now
Kazan, Kazan, Russian Federation
Type:
Article
Pages:
from 41
to 45
Status:
Published
Received:
23.12.2025
Accepted:
25.12.2025
Published:
25.12.2025
Language:
Russian
Keywords:
THERMAL RADIATION, SATURATED AND UNSATURATED HYDROCARBONS, INTEGRAL COEFFICIENT, PARTIAL PRESSURE
Abstract (English):
Thermal radiation coefficients of gaseous hydrocarbons were measured in the temperature range of 473-673 K at full atmospheric pressure and gas layer thicknesses of 0.3 m and 0.15 m. The influence of the number of carbon atoms in a gas molecule, the structure of molecules, partial pressure and the thickness of the gas layer on its emissivity was studied. It was found that with an increase in the homologue number at a constant temperature, the thermal radiation coefficient of gaseous hydrocarbons increases, since with the addition of methylene groups CH2, the number of vibrations and their intensity increases. A comparison of the absorption spectra of hydrocarbons showed that the complication of the hydrocarbon structure is accompanied by the appearance of new vibrational-rotational bands. In addition, the increase in emissivity with an increase in the number of hydrocarbon atoms in a molecule is not uniform. If during the transition of ethane-propane, ethylene-propylene, butane-pentane, butylenes-amylenes a sharp increase in the thermal radiation coefficient by 25-30% is observed, then during the transition of propane-butane and propylene-butylenes this change is approximately 10%. As the molecule becomes more complex, a more uniform increase in emissivity is observed. At other temperatures, this dependence is similar. A close relationship has been discovered between the emissivity of gaseous hydrocarbons and the structure of molecules. Thus, with the same number of carbon atoms in a molecule (ethane-ethylene, propane-propylene, butane-butylenes, pentane-amylenes), the thermal radiation coefficient of unsaturated hydrocarbons is, on average, 30% higher than that of saturated hydrocarbons, and that of isomers is 5-10% lower than that of normal hydrocarbons. Based on experimental data, it has been revealed that a change in partial pressure has a stronger effect on the thermal radiation coefficient of hydrocarbons than a change in layer thickness.
Thermal radiation coefficients of gaseous hydrocarbons were measured in the temperature range of 473-673 K at full atmospheric pressure and gas layer thicknesses of 0.3 m and 0.15 m. The influence of the number of carbon atoms in a gas molecule, the structure of molecules, partial pressure and the thickness of the gas layer on its emissivity was studied. It was found that with an increase in the homologue number at a constant temperature, the thermal radiation coefficient of gaseous hydrocarbons increases, since with the addition of methylene groups CH2, the number of vibrations and their intensity increases. A comparison of the absorption spectra of hydrocarbons showed that the complication of the hydrocarbon structure is accompanied by the appearance of new vibrational-rotational bands. In addition, the increase in emissivity with an increase in the number of hydrocarbon atoms in a molecule is not uniform. If during the transition of ethane-propane, ethylene-propylene, butane-pentane, butylenes-amylenes a sharp increase in the thermal radiation coefficient by 25-30% is observed, then during the transition of propane-butane and propylene-butylenes this change is approximately 10%. As the molecule becomes more complex, a more uniform increase in emissivity is observed. At other temperatures, this dependence is similar. A close relationship has been discovered between the emissivity of gaseous hydrocarbons and the structure of molecules. Thus, with the same number of carbon atoms in a molecule (ethane-ethylene, propane-propylene, butane-butylenes, pentane-amylenes), the thermal radiation coefficient of unsaturated hydrocarbons is, on average, 30% higher than that of saturated hydrocarbons, and that of isomers is 5-10% lower than that of normal hydrocarbons. Based on experimental data, it has been revealed that a change in partial pressure has a stronger effect on the thermal radiation coefficient of hydrocarbons than a change in layer thickness.
Keywords:
THERMAL RADIATION, SATURATED AND UNSATURATED HYDROCARBONS, INTEGRAL COEFFICIENT, PARTIAL PRESSURE
THERMAL RADIATION, SATURATED AND UNSATURATED HYDROCARBONS, INTEGRAL COEFFICIENT, PARTIAL PRESSURE
