Investigation on Using Amine Split Flow to Reduce Maximum Temperature of the Fajr-Jam Refinery Absorption Tower for Control Corrosion Rate

Irandoost, Abdollah; Zare Aliabadi, Hasan; Saei Moghaddam, Mojtaba

Investigation on Using Amine Split Flow to Reduce Maximum Temperature of the Fajr-Jam Refinery Absorption Tower for Control Corrosion Rate

Document Type : Original Research

Authors

A. irandoost

H. Zare Aliabadi

M. Saei moghaddam

Quchan University of Technology

Abstract

Research subject: Regarding to temperature effect on the rate of corrosion in absorption tower of gas refineries, it is very useful to examine and invest on new methods to decrease the temperature in mentioned towers.

Research approach: By studying different types of corrosion in amine processes and the influence of different variables on them, the dominant effect of temperature on the rate of corrosion in absorption towers was determined. Due to decreasing temperature in the absorption tower the surface tension of amine solvent and corrosion rate decrease. The reduction in surface tension reduces the foaming and flooding in the tower, which reduces the concentration of sour gases CO₂ and H₂S from the natural gas outlet. Various methods of reducing temperature in the absorption tower such as increasing flow rate of circulation amine solvent, opening the insulated tower wall and injecting amines into the middle of the tower have been studied. Aspen- HYSYS software was used to investigate the effects of amine injection into the middle of the tower.

Main result: According to the simulation results, the maximum temperature in the two-feed absorption tower was reduced to about 3°C and in the three feedstocks the maximum temperature was reduced to about 10°C. Also, as the CO₂ and H₂S concentration of the gas outlet decreases, the amount of Spent Caustic and catalyst in the lower part of the tower will decrease. Finally, it was found that among the above methods, injection of amine into the middle of the tower had the highest efficiency in decreasing the temperature of it. However, a combination of the above methods can be used to further reduce the temperature in the tower.

Keywords

Absorption Tower

Amines

Acidic Gases

Corrosion

Maximum Temperature

Subjects

Petroleum Engineering

[1] Tohid N.Borhani, Meihong Wang, Role of Solvents in CO2 Capture Processes: The Review of Selection and Design Methods, Renewable and Sustainable Energy Reviews, 114 (2019) 109299.
[2] Jak Tanthana et al, Experimental Study of a Hydrophobic Solvent for Natural Gas Sweetening Based on the Solubility and Selectivity for Light Hydrocarbons (CH4, C2H6) and Acid Gases (CO2 and H2S) at 298−353K, Journal of Chemical & Engineering Data 2019 64 (2), 545-556.
[3] Walaa M. Shehata et al, Article Open Access Challenges and Solutions of Gas Sweetening Unit in Polypropylene Plant Using Process Simulation: A Case Study, Pet Coal (2019); 61(3) 517-532.
[4] Habin Cho et al, Automated Process Design of Acid Gas Removal Units in Natural Gas Processing, Computers and Chemical Engineering (2015).
[5] Wanjun Guo et al, Simulation and Energy Performance Assessment of CO2 Removal from Crude Synthetic Natural Gas via Physical Absorption Process, Journal of Natural Gas Chemistry 21(2012) 633–638.
[6] Robert N. Maddox., "Gas Conditioning and Processing", Vol. 4, Third Edition, 1994.
[7] دکتر مرتضی احسانی، بررسی علل خوردگی بدنه و سینی های برج جذب و احیا و تعیین پوشش مناسب، شرکت پالایش گاز فجر جم
[8] Hyung Kun Bae et al, Simulation of CO2 Removal in a Split-Flow Gas Sweetening Process, Korean J. Chem. Eng., 28(1) (2011) 643-648.
[9] Sarntharm Mudhasakul et al, A Simulation Model of a CO2 Absorption Process with Methyldiethanolamine Solvent and Piperazine as an Activator, International Journal of Greenhouse Gas Control 15 (2013) 134–141.
[10] Priyabrata Pal et al, Role of Aqueous Methyldiethanolamine (MDEA) as Solvent in Natural Gas Sweetening Unit and Process Contaminants with Probable Reaction Pathway, Journal of Natural Gas Science and Engineering 24 (2015) 124-131.
[11] Mashallah Rezakazemi et al, Hybrid Systems: Combining Membrane and Absorption Technologies Leads to more Efficient Acid Gases (CO2 and H2S) Removal from Natural Gas, Journal of CO2 Utilization 18 (2017) 362–369.
[12] Toluleke Emmanuel Akinola et al, Study of CO2 Removal in Natural Gas Process Using Mixture of Ionic Liquid and MEA through Process Simulation, Fuel 236 (2019) 135–146.
[13] Alireza Bahadori, Natural Gas Sweetening, Technology and Engineering Design 2014, Pages 483-518.
[14] Pao Chi Chen and Yan-Lin Lai, Optimization in the Stripping Process of CO2 Gas Using Mixed Amines, Energies 12 (2019) 1-17.
[15] Nayef Ghasem, Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation, Membranes (Basel), 9 (2019) 1-16.