Investigation of the physicochemical nature of the processes occurring during the regeneration of aluminosilicate adsorbents in gas treatment units
Abstract
The study is devoted to the physicochemical investigation of the processes of regeneration of aluminosilicate adsorbents in gas treatment units. The objects of the study were natural gas supplied to the adsorption unit with an adsorbent, the products of its transformations, as well as the stable gas condensate formed during the regeneration process. The determination of the components in the condensate formed in the adsorption unit with the adsorbent was carried out by gas chromatography-mass spectrometry. The analysis of the component composition of the lower fraction of the condensed liquid was carried out by gas-liquid chromatography. After passing the natural gas through the gas treatment unit, substances that were absent in the initial composition were identified: dimethyl ether, dimethyl sulphide, tetramethylbenzene, pentamethylbenzene, hexamethylbenzene, and others. Chromatographic analysis of the bottom fraction of the condensed liquid showed the presence of methanol and dimethyl ether in it. The quantitative assessment of the methanol content in the investigated fractions was carried out using standard methanol samples. The purpose of this study was the investigation of he chemical processes occurring during the regeneration of aluminosilicate adsorbents and the conversion of methanol extracted from natural gas in gas treatment units. The presence of methanol in the products of natural gas purification is due to its use as an inhibitor of hydrate formation in gas production technology, and the presence of some substances absent in the initial gas is explained by chemical reactions occurring under conditions of high-temperature regeneration in gas treatment units. The conditions for the regeneration of aluminosilicate adsorbents providing the conversion of methanol to dimethyl ether and methylation of hydrogen sulphide with the formation of dimethyl sulphide are considered. The physicochemical nature of methylation of aromatic compounds contained in natural gas and the formation of solid alkylarenes has been studied. The distribution of adsorbed components in industrial adsorption units for natural-gas dehydration has been established. Optimization of the conditions for the described processes allowed reducing the amount of harmful emissions and reduce the consumption of fuel gas consumed during the operation of a stationary thermal treatment unit. These processes are of practical importance, as they increase the environmental friendliness of the technological process.
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Temerdashev Z.A., Rudenko A.V., Kolychev I.A., Kostina A.S, Ecology and Industry of Russia, 2019, Vol. 23, No 11, pp. 4-9.
Rashidi H., Hamoule T., Reza Khosravi Nikou M., Shariati A., Iranian Journal of Oil & Gas Science and Technology, 2013, Vol. 2, No 4, pp. 67-73. doi: 10.22050/ijogst.2013.4797.
Catizzone E., Migliori M., Aloise A., Lamberti R. et al., Journal of Chemistry, 2019, Vol. 2019, pp. 1-9. doi: 10.1155/2019/3084356.
Bateni H., Able C. // Catalysis in Indus-try, 2019, Vol, 11, No 1, pp. 7-33. doi: 10.1134/S2070050419010045.
Macina D., Piwowarska Z., Tarach K., Góra-Marek K. et al., Materials Research Bulletin, 2016, Vol. 74, pp. 425-435. doi: 10.1016/j.materresbull.2015.11.018.
Fečík M., Plessow P.N., Studt F., ACS Catalysis, 2020, Vol. 10, No 15, pp. 8916-8925. doi: 10.1021/acscatal.0c02037.
DeLuca M., Kravchenko P., Hoffman A., Hibbitts D., ACS Catalysis, 2019, Vol. 9, No 7, pp. 6444-6460. doi: 10.1021/acscatal.9b00650.
De Wispelaere K., Martinez-Espin J.S., Hoffmann M.J., Svelle S. et al., Catalysis Today, 2018, Vol. 312, pp. 35-43. doi: 10.1016/j.cattod.2018.02.042.
Martinez-Espin J.S., De Wispelaere K., Erichsen M.W., Svelle S. et al., Journal of Catalysis, 2017, Vol. 349, pp. 136-148. doi: 10.1016/j.jcat.2017.03.007.
Hill I., Malek A., Bhan A., ACS Cataly-sis, 2013, Vol. 3, No 9, pp. 1992-2001. doi: 10.1021/cs400377b.
Kvamme B., Selvåg, J., Saeidi N., Kuz-netsova T., Physical Chemistry Chemical Physics, 2018, Vol. 20, No 34, pp. 21968-21987. doi: 10.1039/C8CP02447B.
Shipovalov A.N., Zemenkova M.Y., Shpilevoj V.A., Aleksandrov M.A. et al., Sovremennye problemy nauki i obrazovani-ya, 2015, No 2-2, pp. 31-38.
Ivanova I.I., Pomakhina E.B., Borodina I.B., Rebrov A.I. et al., Studies in Surface Science and Catalysis, 2004, Vol. 154, pp. 2221-2227. doi: 10.1016/S0167-2991(04)80479-8
