Development of a preliminary model for addressing naphthenic acid corrosion of ASTM A-335 P9 using an eco-enzyme green inhibitor on heavy-vacuum gas oil residue

Authors

DOI:

https://doi.org/10.15587/1729-4061.2025.347916

Keywords:

green corrosion inhibitor, biomass, eco-enzyme, Langmuir isotherm, adsorption, refinery

Abstract

ASTM A-335 P9 is widely employed within the piping infrastructure of the crude distillation unit for the conveyance of heavy vacuum gas oil (HVGO) crude residue before subsequent downstream processing, owing to its high mechanical properties.

Due to elevated operating temperatures, the presence of sulfur, the material remains vulnerable to naphthenic acid corrosion, which can compromise its structural and operational integrity. This study examines the material's response to the application of eco-enzyme as a green corrosion inhibitor (GCI) employing extensive several tests under naphthenic acid distillate which collected and processed from the heavy vacuum gas oil piping. optical emission spectroscopy (OES), ultraviolet-visible spectroscopy (UV-Vis), and Fourier rransform infra-red (FTIR) equipped with potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) to dive into the corrosion resistance of EE inhibitor under the naphthenic acid extracts. Moreover, the scanning electronic microscopy and energy X-Ray dispersive (SEM-EDX) was utilized to reveal the surface morphology and the elemental identity of the retained inhibition mechanism. Based on the OES, the presence of Cr and Mo are highlighted with the composition of 9.135% and 0.894% which aligned with the 9Cr-1Mo material specification. The electronic transition of π-π* and n-π* transitions is in good agreement with the presence of aromatic -OH, C-H sp3, R-CHO, C=O, C-O and aromatic absorption at 525 nm, which correlates with peaks observed in FTIR spectra at 3200–3400, 2800–3000 cm-1. The high inhibition efficiency beyond 77% is correlated to the adsorption of the inhibitor that thermodynamically adheres to the Langmuir adsorption isotherm and applicable of model the HVGO system

Author Biographies

Kadek Ambara Jaya, Universitas Indonesia

Postgraduate Student

Department of Materials and Metallurgical Engineering

Johny Soedarsono, Universitas Indonesia

Doctor of Engineering, Professor

Prof. Johny Wahyuadi Laboratory

Department of Metallurgical and Materials Engineering

Yudha Pratesa, Universitas Indonesia

Doctor of Engineering

Prof. Johny Wahyuadi Laboratory

Department of Metallurgical and Materials Engineering

Rini Riastuti, Universitas Indonesia

Doctor of Engineering, Senior Lecturer

Prof. Johny Wahyuadi Laboratory

Department of Metallurgical and Materials Engineering

Agus Kaban, Universitas Indonesia

Doctor of Engineering, Postgraduate Student

Prof. Johny Wahyuadi Laboratory

Department of Metallurgical and Materials Engineering

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Development of a preliminary model for addressing naphthenic acid corrosion of ASTM A-335 P9 using an eco-enzyme green inhibitor on heavy-vacuum gas oil residue

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Published

2025-12-30

How to Cite

Jaya, K. A., Soedarsono, J., Pratesa, Y., Riastuti, R., & Kaban, A. (2025). Development of a preliminary model for addressing naphthenic acid corrosion of ASTM A-335 P9 using an eco-enzyme green inhibitor on heavy-vacuum gas oil residue. Eastern-European Journal of Enterprise Technologies, 6(6 (138), 28–41. https://doi.org/10.15587/1729-4061.2025.347916

Issue

Vol. 6 No. 6 (138) (2025): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2025 Kadek Ambara Jaya, Johny Soedarsono, Yudha Pratesa, Rini Riastuti, Agus Kaban

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