Yu.F. Chirkova*, U.Zh. Mirzakimov**, M.E. Semenov***, S.A. Nazarychev****, R.S. Pavelyev*****,

M.A. Varfolomeev******, S.A. Sitnov*******

Kazan Federal University, Kazan, 420008 Russia

E-mail: *yu-ya98@yandex.ru, **mirzakimovqs@gmail.com,

***xotoy_82@mail.ru****nazarichev.sa@gmail.com, *****rpavelyev@gmail.com,

******vma.ksu@gmail.com, *******sers11@mail.ru

Received October 26, 2022


ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2022.4.551-566

For citation: Chirkova Yu.F., Mirzakimov U.Zh., Semenov M.E., Nazarychev S.A., Pave­lyev R.S., Varfolomeev M.A., Sitnov S.A. Promotion of hydrate formation with the use of polyatomic and cyclic alcohols sulfosuccinates: Studies under dynamic conditions. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2022, vol. 164, no. 4, pp. 551–566. doi: 10.26907/2542-064X.2022.4.551-566. (In Russian)

Abstract

As the most environmentally friendly fossil fuel, natural gas has been consumed intensively around the world. However, transportation and storage difficulties still pose a serious constraint to its efficient use. Of all methods for storing natural gas, solidified natural gas technology relying on gas hydrate formation, looks feasible and promising because it is green and safe, as well as assumes moderate thermobaric conditions and easy regasification. The large-scale adoption of this technology is hindered by the low rate of hydrate formation, which can be increased with the help of chemical additives called hydrate formation promoters. This article presents new promoting agents based on sulfosuccinates of cyclic and polyatomic alcohols. We studied their promoting activity in high-pressure autoclaves, foamability, and interfacial tension. The obtained results show that the synthesized reagents enhance the formation of hydrates as compared to pure water, and, unlike the well-known commercial reagent sodium dodecyl sulfate, they do not form a stable foam, which is essential for the operational properties of promoters.

Keywords: gas hydrates, kinetic promoters of hydrate formation, natural gas storage, sulfosuccinates

Acknowledgments. This study was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities (project no. FZSM-2021-0025).

Figure Captions

Fig. 1. Schematic representation of the synthesis of target sulfosuccinates.

Fig. 2. Arrangement of the experimental setup for studying hydrate formation under dynamic conditions (Kazan Federal University): 1 – cylinder with methane; 2 – gas booster; 3 – pressure sensor; 4 – direct current source; 5 – overhead stirrer; 6 – magnetic coupling; 7 – thermocouple; 8 – autoclave; 9 – thermostat; 10 – switch; 11 – data acquisition system (Tercon); 12 – computer.

Fig. 3. Dependence of gas consumption (mmol) on time for all test samples at a concentration of 0.05 wt. %.

Fig. 4. Appearance of foam for samples 2b (on the left) and SDS (on the right).

Fig. 5. Appearance of methane hydrate before (on the left) and after (on the right) regasification for samples 2e and SDS.

Fig. 6. Dependence of interfacial tension on promoter concentration.

Fig. 7. Dependence of surface tension on promoter concentration.

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