Selection of mass transfer devices for absorption concentration of hydrogen-containing gas (HCG) in catalytic reforming units

This article examines the pressing issue of improving the efficiency of semi-regenerative catalytic reforming units by increasing the cycle length between catalyst regenerations. This work also considers the possibility of using absorption purification of hydrogen-containing gas to remove hydrocarbons to minimize coke deposition on the catalyst surface. This article aims to prove the feasibility of absorption concentration within the unit and to achieve a target hydrogen gas concentration of up to 98 % in the circulating stream. The tasks involve analysis of packed contact devices and development of recommendations for their selection for this process. To solve these tasks, the authors employ a combination of calculation and analytical methods. These methods include evaluating different packing types, technological and hydraulic calculations to determine the geometric parameters of packed beds. The work compares several structured and random packing types that differ in size, material, and numerical values of key characteristics – specific surface area, and void fraction. Based on a parametric analysis performed, the authors identify a correlation between the performance of contact devices and the geometric characteristics of absorption columns. This correlation can support predictive selection of suitable packings. On this basis, the article proposes a methodological approach for comparative analysis and selection of packings based on specific mass transfer conditions, and a criterion for evaluating their applicability. In order to achieve these objectives, the authors select two most efficient types of packing that meet the process requirements. The selection considers geometric constraints, the minimization of packing volume, and the proposed applicability coefficient. This approach aids in reducing coke formation and increasing the catalyst cycle length between regenerations.

1. Maslyansky G. N., Shapiro R. N. Сatalytic reforming of gasoline. Chemistry and technology. St. Petersburg: Chemistry; 1985. (In Russ.).

2. Akhmetov S. A. Deep Oil and Gas Refining Technology. Ufa: Gilem; 2002. (In Russ.).

3. Kapustin V. M., Gureev A. A. Oil Refining Technology. Part 2. Destructive Processes. Moscow: KolosS; 2007. (In Russ.).

4. Smolikov M. D., Kiryanov D. I., Shkurenok V. A., Bikmetova L. I., Belopukhov E. A., Yablokova S. S., [et al.]. The integrated reforming and isomerization of gasoline fractions for the production of eco-friendly motor gasolines. Kataliz v promyshlennosti. 2022;22(1):40-56. (In Russ.). https://doi.org/10.18412/1816-03872022-1-40-56

5. Vasyukova A. N., Zadachina O. P., Nasonova N. V., Perepelkina L. I. Typical Calculations in Physical and Colloid Chemistry. Blagoveshchensk: DalGAU; 2012. (In Russ.).

6. Afonina I. I., Sarilov M. Iu. Modernization of the Catalytic Reforming Unit to Improve the Quality of Hydrogen-containing Gas. Scientific Notes of Komsomolsk-on-Amur State Technical University. 2017;1(4(32)):59–65. (In Russ.).

7. Sergeev V. S., Taranova L.V. Increasing the Run Length of a Fixed-bed Catalytic Reforming unit. New Technologies for the Oil and Gas Region. Proceedings of the International Scientific and Practical Conference of Students, Graduate Students, and Young Scientistsю. Tymen: TYUIU; 2025. Р. 268–271. (In Russ.).

8. Filippov V. V. Hydrodynamics of a packed column. Samara: SamGTU; 2022. (In Russ.).

9. Dmitriev E. A., Komlyashev R. B., Morgunova E. P., Trushin A. M., Veshnyakov A.V., Salnikova L. S. Equipment for Separation Processes of Homogeneous and Heterogeneous Systems. Moscow: RHTU im. D. I. Mendeleeva; 2016. (In Russ.).

10. Vetoshkin A. G. Protection of the Atmosphere from Gas Emissions. Penza, PnzGU; 2004. (In Russ.).

11. Titova L. M., Lotsmanova O. V., Telechkina E. R. Random Column Packing. South Siberian Scientific Bulletin. 2020;2(30):80–88. (In Russ.).

12. Manufacturer's Catalog «SP-teploobmen». Available at: https://spteploobmen.ru/. (Accessed 20 december 2024) (In Russ.).

13. Novikova I. V., Pushnov A. S. About the Interrelation of the Main Geometric Characteristics of Structured Packings. Chemical Technology. 2015;(4):21. (In Russ.).

14. «INZHEKHIM» Engineering and Implementation Center. Available at: https://ingehim.ru/about/productscat/ (Accessed 20 december 2024) (In Russ.).

15. Ramm V. M. Gas Absorption. Moscow: Chemistry; 1976. (In Russ.).

16. Planovskij A. N., Ramm V. M., Kagan S. Z. Processes and Apparatus of Chemical Technology. Moscow: Chemistry; 1967. (In Russ.).

17. Ponikarov I. I., Perelygin O. A., Doronin V. N., Gajnullin M. V. Machinery and Apparatus of Chemical Industries. Moscow: Machine building industry; 1989. (In Russ.).