Study of the robustness of a low-temperature dual-pressure process for removal of CO₂ from natural gas

Abstract

The growing use of energy by most of world population and the consequent increasing demand for energy are making unexploited low quality gas reserves interesting from an industrial point of view. To meet the required specifications for a natural gas grid, some compounds need to be removed from the sour stream. Because of the high content of undesired compounds (i.e., CO₂) in the stream to be treated, traditional purification processes may be too energy intensive and the overall system may result unprofitable, therefore new technologies are under study. In this work, a new process for the purification of natural gas based on a low temperature distillation has been studied, focusing on the dynamics of the system. The robustness of the process has been studied by dynamic simulation of an industrial-scale plant, with particular regard to the performances when operating conditions are changed. The results show that the process can obtain the methane product with a high purity and avoid the solidification of carbon dioxide.

Key words： CO₂ capture; innovative process; cryogenic distillation; dynamic simulation; solid-liquid-vapor equilibrium

References

1 Burgers W F J, Northrop P S, Kheshgi H S, Valencia J A. Worldwide development potential for sour gas. Energy Procedia, 2011, 4: 2178–2184

2 Ravanchi M, Sahebdelfar S, Zangeneh F. Carbon dioxide sequestration in petrochemical industries with the aim of reduction in greenhouse gas emissions. Frontiers of Chemical Science and Engineering, 2011, 5(2): 173–178

3 Rufford T E, Smart S, Watson G C Y, Graham B F, Boxall J, Diniz da Costa J C, May E F. The removal of CO₂ and N₂ from natural gas: A review of conventional and emerging process technologies. Journal of Petroleum Science Engineering, 2012, 94-95: 123–154

4 Mumford K A, Wu Y, Smith K H, Stevens G W. Review of solvent based carbon-dioxide capture technologies. Frontiers of Chemical Science and Engineering, 2015, 9(2): 125–141

5 Wang M, Yang D, Wang Z, Wang J, Wang S. Effects of pressure and temperature on fixed-site carrier membrane for CO₂ separation from natural gas. Frontiers of Chemical Engineering in China, 2010, 4(2): 127–132

6 Xiao Y, Low B T, Hosseini S S, Chung T S, Paul D R. The strategies of molecular architecture and modification of polyimide-based membranes for CO₂ removal from natural gas—A review. Progress in Polymer Science, 2009, 34(6): 561–580

7 Yong W F, Li F Y, Chung T S, Tong Y W. Highly permeable chemically modified PIM-1/Matrimid membranes for green hydrogen purification. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 2013, 1(44): 13914–13925

8 Baker R W, Lokhandwala K. Natural gas processing with membranes: An overview. Industrial & Engineering Chemistry Research, 2008, 47(7): 2109–2121

9 Wu Y, Wang Y, Zeng Q, Gong X, Yu Z. Experimental study on capturing CO₂ greenhouse gas by mixture of ammonia and soil. Frontiers of Chemical Engineering in China, 2009, 3(4): 468–473

10 Olajire A A. CO₂ capture by aqueous ammonia process in the clean development mechanism for Nigerian oil industry. Frontiers of Chemical Science and Engineering, 2013, 7(3): 366–380

11 Kohl A L, Nielsen R. Gas Purification. 5th ed. Houston: Gulf Publishing Company, Book Division, 1997

12 GPSA. Engineering Data Book. 12th Edition. Tulsa: Gas Processors Suppliers Association, 2004

13 Moioli S, Pellegrini L A. Modeling the methyldiethanolamine-piperazine scrubbing system for CO₂ removal: Thermodynamic analysis. Frontiers of Chemical Science and Engineering, 2016, 10(1): 162–175

14 Moioli S, Pellegrini L A. Improved rate-based modeling of the process of CO₂ capture with PZ solution. Chemical Engineering Research & Design, 2015, 93: 611–620

15 Moioli S. The rate-based modelling of CO₂ removal from the flue gases of power plants. WIT Transactions on Ecology and the Environment, 2014, 186: 635–646

16 Moioli S, Pellegrini L A. Physical properties of PZ solution used as a solvent for CO₂ removal. Chemical Engineering Research & Design, 2015, 93: 720–726

17 Moioli S, Nagy T, Langé S, Pellegrini L A, Mizsey P. Simulation model evaluation of CO₂ capture by aqueous MEA scrubbing for heat requirement analyses. Energy Procedia, 2017, 114: 1558–1566

18 Nagy T, Moioli S, Langé S, Pellegrini L A, Mizsey P. Improvement of post-combustion carbon capture process in retrofit case. Energy Procedia, 2017, 114: 1567–1575

19 Langé S. Purification of natural gas by means of a new low temperature distillation process. Dissertation for the Doctoral Degree. Milano: Politecnico di Milano, 2015, 1–299

20 Olajire A A. CO₂ capture and separation technologies for end-of-pipe applications—A review. Energy, 2010, 35(6): 2610–2628

21 Langé S, Moioli S, Pellegrini L A. Vapor-liquid equilibrium and enthalpy of absorption of the CO₂-MEA-H₂O system. Chemical Engineering Transactions, 2015, 43: 1975–1980

22 Hochgesand G. Rectisol and purisol. Industrial & Engineering Chemistry, 1970, 62(7): 37–43

23 Holmes A S, Ryan J M. Cryogenic distillative separation of acid gases from methane. US Patent, 4318723, 1982-03-09

24 Holmes A S, Ryan J M. Distillative separation of carbon dioxide from light hydrocarbons. US Patent, 4350511, 1982-09-21

25 Holmes A S, Price B C, Ryan J M, Styring R E. Pilot tests prove out cryogenic acid-gas/hydrocarbon separation processes. Oil & Gas Journal, 1983, 27: 85–91

26 Haut R C, Denton R D, Thomas E R. Development and application of the controlled-freeze-zone process. SPE Production Engineering, 1989, 4(3): 265–271

27 Michael E, Parker P E, Northrop S, Valencia J A, Foglesong R E, Duncan W T. CO₂ management at ExxonMobil’s LaBarge field, Wyoming, USA. Energy Procedia, 2011, 4: 5455–5470

28 Northrop P S, Valencia J A. The CFZ™ process: A cryogenic method for handling high-CO₂ and H₂S gas reserves and facilitating geosequestration of CO₂ and acid gases. Energy Procedia, 2009, 1(1): 171–177 doi:10.1016/j.egypro.2009.01.025

29 Valencia J A, Denton R D. Method and apparatus for separating carbon dioxide and other acid gases from methane by the use of distillation and a controlled freeze zone. US Patent, 4533372, 1985-06-08

30 Valencia J A, Victory D J. Method and apparatus for cryogenic separation of carbon dioxide and other acid gases from methane. US Patent, 4923493, 1990-05-08

31 Valencia J A, Victory D J. Bubble cap tray for melting solids and method for using same. US Patent, 5265428, 1993-11-30

32 Hart A, Gnanendran N. Cryogenic CO₂ capture in natural gas. Energy Procedia, 2009, 1(1): 697–706

33 Lallemand F, Perdu G, Normand L, Weiss C, Magne-Drisch J, Gonnard S. Extending the treatment of highly sour gases: Cryogenic distillation, digital refining. Processing. Operation and Maintenance, 2014, 2014: 1–2

34 Kelley B T, Valencia J A, Northrop P S, Mart C J. Controlled Freeze Zone™ for developing sour gas reserves. Energy Procedia, 2011, 4: 824–829

35 Langé S, Pellegrini L A, Vergani P, Lo Savio M. Energy and economic analysis of a new low-temperature distillation process for the upgrading of high-CO₂ content natural gas streams. Industrial & Engineering Chemistry Research, 2015, 54(40): 9770–9782

36 Pellegrini L A. Process for the removal of CO2 from acid gas. Google Patents, WO 2014054945 A2, 2014-04-10

37 Baccanelli M. Analisi tecno-economica di soluzioni di processo a bassa temperatura per la produzione di LNG. Dissertation for the Master Degree. Milano: Politecnico di Milano, 2015 (in Italian)

38 AspenTech. ASPEN HYSYS®. Burlington, MA: AspenTech, 2014

39 Pellegrini L A, Moioli S, Brignoli F, Bellini C. LNG technology: The weathering in above-ground storage tanks. Industrial & Engineering Chemistry Research, 2014, 53(10): 3931–3937

40 Donnelly H G, Katz D L. Phase equilibria in the carbon dioxide–methane system. Industrial & Engineering Chemistry, 1954, 46(3): 511–517

41 Sobocinski D P, Kurata F. Heterogeneous phase-equilibria of the hydrogen sulfide-carbon dioxide system. AIChE Journal. American Institute of Chemical Engineers, 1959, 5(4): 545–551

42 Davis J A, Rodewald N, Kurata F. Solid-liquid-vapor phase behavior of the methane-carbon dioxide system. AIChE Journal. American Institute of Chemical Engineers, 1962, 8(4): 537–539

43 Im U K, Kurata F. Phase equilibrium of carbon dioxide and light paraffins in presence of solid carbon dioxide. Journal of Chemical & Engineering Data, 1971, 16(3): 295–299

44 Shen T T, Gao T, Lin W S, Gu A Z. Determination of CO₂ solubility in saturated liquid CH₄ + N₂ and CH₄ + C₂H₆ mixtures above atmospheric pressure. Journal of Chemical & Engineering Data, 2012, 57(8): 2296–2303

45 Cheung H, Zander E H. Solubility of carbon dioxide and hydrogen sulfide in liquid hydrocarbons at cryogenic temperatures. Chemical Engineering Symposium Series, 1968, 64(88): 34–37

46 Brewer J, Kurata F. Freezing points of binary mixtures of methane. AIChE Journal. American Institute of Chemical Engineers, 1958, 4(3): 317–321

47 Streich M N. 2 removal from natural gas. Hydrocarbon Processing, 1970, 49(4): 86–88

48 Yokozeki A. Analytical equation of state for solid-liquid-vapor phases. International Journal of Thermophysics, 2003, 24(3): 589–620

49 Stephanopoulos G. Chemical Process Control: An Introduction to Theory and Practice.  New Jersey: Prentice Hall, 1984

50 Metz B, Davidson O, de Conik H, Loos M, Meyer L. IPCC Special Report on Carbon Dioxide Capture and Storage. Prepared by Working Group III of the Intergovernmental Panel on Climate Change. Cambridge: Cambridge University Press, 2005

51 Perry R H, Green D W. Perry's Chemical Engineers' Handbook. 7th ed. Singapore: McGraw-Hill International Editions, 1997