A study to reduce atmospheric emissions of an existing natural gas dehydration plant using multiple thermodynamic models

  • M. Amouei TorkmahallehEmail author
  • Z. Assanova
  • M. Baimaganbetova
  • A. Zinetullina
Original Paper


Using Aspen Plus, operating parameters of an existing triethylene glycol natural gas dehydration plant including the solvent circulation rate, stripping gas flow rate, regenerator reboiler duty, solvent temperature, absorber (contactor) pressure, flash unit pressure and regenerator pressure were optimized to reduce BTEX, VOCs and CO2 emissions. The plant consists of an absorber, a flash tank, a stripper and a regenerator. Two thermodynamic models including PRMHV2 and PSRK were utilized for this plant. The sensitivity analysis study was conducted using two methods, namely Method A and Method B. Method A considered the effect of an individual parameter on the emissions, while other parameters were set at their base case values. Method B studied the impact of a given parameter, while other parameters were at their optimum values. Using the two methods, BTEX emission reduced more than 40%, while VOCs and CO2 emissions were decreased more than 60%. However, the moisture content of the dehydrated gas was higher when Method A was applied (249.9 × 10−6 kg H2O/m3) compared to Method B (65.7 × 10−6 kg H2O/m3). Method B was found to be a more precise approach to achieve the optimum plant operation.


Natural gas dehydration CO2 emission BTEX VOCs Simulation Aspen Plus 



The authors acknowledge school of engineering and chemical engineering department at Nazarbayev University for their administrative supports to the Chemical and Aerosol Research Team (CART).

Supplementary material

13762_2018_1802_MOESM1_ESM.docx (883 kb)
Supplementary material 1 (DOCX 882 kb)


  1. Amouei Torkmahalleh M, Magazova A, Magazova G (2016) Simulation of environmental impact of an existing natural gas dehydration plant using a combination of thermodynamic models. Process Saf Environ Protect 104:38–47CrossRefGoogle Scholar
  2. Braek AM, Almehaideb RA, Darwish N, Hughes R (2001) Optimization of process parameters for glycol unit to mitigate the emission of BTEX/VOCs. Trans Chem 79(Part B):218–232Google Scholar
  3. Campbell JM (1992) Gas conditioning and processing, volume 2: the equipment modules. In: John M, Campbell C (eds) Campbell petroleum series, Norman, OklahomaGoogle Scholar
  4. Darwish NA, Hilal N (2008) Sensitivity analysis and faults diagnosis using artificial neural networks in natural gas TEG-dehydration plants. Chemical Eng J 137(2):189–197CrossRefGoogle Scholar
  5. Darwish NA, Al-Mehaideb RA, Braek AM, Hughes R (2004) Computer simulation of BTEX emission in natural gas dehydration using PR and RKS equations of state with different predictive mixing rules. Environ Model Softw 19:957–965CrossRefGoogle Scholar
  6. EPA (2012) Oil and natural gas sector: new source performance standards and national emission standards for hazardous air pollutants reviews. 40 CFR Part 63.
  7. Eslamimanesh A, Mohammadi AH, Salamat Y, Shojaei MJ, Eskandari S, Richon S (2013) Phase behavior of mixture of supercritical CO2+ ionic liquid: thermodynamic consistency test of experimental data. AIChE J 59:3892–3913CrossRefGoogle Scholar
  8. Farag HA, Ezzat MM, Amer H, Nashed AW (2011) Natural gas dehydration by desiccant materials. Alex Eng J 50(4):431–439CrossRefGoogle Scholar
  9. Faulkner LL (2006) Fundamentals of natural gas processing. Taylor and Francis Group, LLC, New YorkGoogle Scholar
  10. Gandhidasan P, Al-Farayedhi AA, Al-Mubarak AA (2001) Dehydration of natural gas using solid desiccants. Energy 26(9):855–868CrossRefGoogle Scholar
  11. Gharagheizi F, Eslamimanesh A, Mohammadi AH, Eskandari S, Richon D (2013) Assessment test for glycol loss in gaseous system. Fuel Process Technol 115:254–260CrossRefGoogle Scholar
  12. Hernandez-Valencia VN, Hlavinka MW, Bullin J (1992) Design glycol units for maximum efficiency. In: Proceedings of the annual convention-gas processors association. Gas Processors AssociationGoogle Scholar
  13. Hlavinka MW, Colllie J, Ashworth A (1998) An analysis of BTEX emissions from amine sweetening and glycol dehydration facilities. In: Proceedings of the laurance reid gas conditioning conference. University of OklahomaGoogle Scholar
  14. Hlavinka MW, Hernandez-Valencia VN, Bullin JA (2006) Influence of process operations on VOCS and BTEX emission from glycol dehydration units. Technical papers. Bryan Research and Engineering, Inc. Accessed 18 Oct 2016.
  15. Hodan WM, Barnard WR (2004) Evaluating the Contribution of PM2.5 Precursor Gases and Re -entrained Road Emissions to Mobile Source PM2.5 Particulate Matter Emissions. MACTEC Federal Programs.
  16. Isa MA, Eldemerdash U, Nasrifar K (2013) Evaluation of potassium formate as a potential modifier of TEG for high performance natural gas dehydration process. Chem Eng Res Des 91(9):1731–1738CrossRefGoogle Scholar
  17. Kohl L, Nielsen RB (1997) Gas purification, 5th edn. Gulf Publishing Company, HoustonGoogle Scholar
  18. Manning FS, Thompson RE (1991) Oilfield processing of petroleum: natural gas. PennWell Books, Tulsa, pp 139–140Google Scholar
  19. Mohamadbeigy K, Forsat K, Binesh R (2007) Experimental studying on gas dewatering by molecular sieve. Pet Coal 49(1):41–45Google Scholar
  20. Nemati Rouzbahani A, Bahmani M, Shariati J, Tohidian T, Rahimpour MR (2014) Simulation, optimization, and sensitivity analysis of a natural gas dehydration unit. J Nat Gas Sci Eng 21:159–169CrossRefGoogle Scholar
  21. Netusil M, Ditl P (2011) Comparison of three methods for natural gas dehydration. J Nat Gas Chem 20:471–476CrossRefGoogle Scholar
  22. Rojey A, Jaffret C (1997) Gas: production processing, transport, 1st edn. Inst. Fracais Du Petrole Pub, ParisGoogle Scholar
  23. Rueter CO, Ogle LD, Reif DL, Evans JM (1993) Development of sampling and analytical methods for measuring BTEX and VOCS from glycol dehydration units. In: SPE/EPA exploration and production environmental conference, San Antonio, TXGoogle Scholar
  24. Saidi M, Parhoudeh M, Rahimpour MR (2014) Mitigation of BTEX emission from gas dehydration unit by application of Drizo process: a case study in Farashband gas processing plant; Iran. J Nat Gas Sci Eng 19:32–45CrossRefGoogle Scholar

Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  • M. Amouei Torkmahalleh
    • 1
    Email author
  • Z. Assanova
    • 1
  • M. Baimaganbetova
    • 1
  • A. Zinetullina
    • 1
  1. 1.Chemical and Aerosol Research Team, Department of Chemical Engineering, School of EngineeringNazarbayev UniversityAstanaKazakhstan

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