Decreasing the Inlet Mercaptan to LPG Treatment to Increase the Efficiency of Adsorber section

Authors
Azarakhsh Goudarzi 1
Zahra Arab Aboosaadei 2
1 MSc Student, Chemistry Engineering Department, Islamic Azad University, Marvdasht, Iran
2 Department of Chemical Engineering, Islamic Azad University, Marvdasht,, Iran
Abstract
To purify and eliminate sulfur compounds from LPG molecular in an oil refinery, a molecular sieve is used; however, due to a change in the feed of the refinery, the amount of sulfur compounds which enters the LPG Unit has increased by 20 times. This change has disrupted the output compounds of the molecular sieve.
In this study, it is suggested that a pre-wash process using Soda should be carried out prior to the molecular sieve adsorption process, to increase the efficiency of adsorption process by molecular adsorbents.
In order to investigate the possibility of using Caustic to pre-wash the LPG Unit input, the piping of Naphtha Merox Unit was investigated; then, using the Promax software, the process was simulated and reviewed. By carefully examining the factors affecting the reactions, it was tried to select the best model and the optimal conditions.
Using caustic, the amount of Mercaptan in the LPG was reduced from 1900 ppm to below 130 ppm and, in line with the original design, it entered the adsorption stage without disrupting the adsorbents performance, and the final values ​​of Mercaptan and H2S reached zero.

Keywords

Subjects

  1. Kidnay, A.J., W.R. Parrish, D.G. McCartney, Fundamentals of natural gas processing, CRC Press, 2011.
  2. E. Mobil, “The Outlook for Energy: A view to 2040”, Irving, TX: Exxon Mobil, 2012.
  3. Cronshaw, I., “World Energy Outlook 2014 projections to 2040: natural gas and coal trade, and the role of China”, Australian Journal of Agricultural and Resource Economics, pp. 571-585, 59 (2015).
  4. Jackson, P., “The future of global oil supply: understanding the building blocks”, in: International Seminar On Nuclear War And Planetary Emergencies—42nd Session, World Scientific, 2010, pp. 271-282.
  5. Samadi Afshar, Ali, Sayed Reza Hashemi, “Role and Effect of Temperature on LPG Sweetening Process”, International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering, Vol: 5, No: 7.
  6. Afshar, A.S., H.M. Hosseini, A. Mir, A. Valipour and Hadi Chabook, “Study on Effective Parameters in Caustic Regeneration on LPG Sweetening”, Petroleum Science and Technology, 2014.
  7. Ghanbari, K., K. Razmkhah and M. Tajerian, “Design Of Caustic Wash System For Light Hydrocarbons Such As Lpg, Ngl And Naphtha”, Petroleum and Coal, Vol. 45, 3-4, pp. 131-134, 2003.
  8. Qeshta, Hanan Jalal, Salaheddin Abuyahya, Priyabrata Pal, Fawzi Bana, “Sweetening liquefied petroleum gas (LPG): Parametric sensitivity analysis using Aspen HYSYS”, Journal of Natural Gas Science and Engineering, 26 (2015) 1011e1017.
  9. Sehgal, V., “Technical and Economic Comparison of Natural Gas Sweetening Process”, ProQuest, 2009.

  • Receive Date 25 April 2022