Malaysian Journal of Analytical Sciences Vol 24 No 1 (2020): 62 - 69

 

 

 

 

CORROSION INHIBITION STUDY ON GLYCEROL AS SIMULTANEOUS GAS HYDRATE AND CORROSION INHIBITOR IN GAS PIPELINES

 

(Kajian Perencatan Kakisan oleh Gliserol sebagai Perencat Serentak untuk Hidrat Gas dan Kakisan dalam Saluran Paip Gas)

 

Vinayagam Sivabalan^1,2, Belkhir Walid^1,3, Yoann Madec^1,4, Ali Qasim^1,2, Bhajan Lal^1,2*

 

¹Chemical Engineering Department,

²CO₂ Research Centre (CO₂RES),

Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 32610, Perak, Malaysia

³Department of Science and Engineering of Materials,

University Institute of Technology, 71100 Chalon-sur-Saône, France

⁴Department of Process Engineering,

National Superior Engineering School of Industrial Technologies (ENGSTI), 64000 Pau, France

 

*Corresponding author:  bhajan.lal@utp.edu.my

 

 

Received: 20 November 2019; Accepted: 23 January 2020

 

 

Abstract

Gas hydrate inhibitors (GHI) and Corrosion Inhibitors (CI) often tend to display antagonistic behaviour in flow assurance of oil and gas. Compatible GHI and CI that have no compromises are still under research and development. Latest researches are being done on multifunctional gas hydrate and corrosion inhibitor (GHCl). Glycerol has been tested for its inhibition performance for both hydrate and corrosion in various distinguished experiments. However, glycerol's corrosion inhibition on X52 mild steel in seawater environment has never been tested. In this work, the corrosion inhibitor property of glycerol on X52 mild steel in 3.5wt.% NaCl brine solution is investigated. The concentrations of glycerol used are 400, 600, 800, 1000, 5000, and 10000 ppm. The pH and conductivity of glycerol have been measured and the relationship between pH, conductivity and corrosion has been thoroughly discussed. The performance of glycerol has been studied further based on adsorption isotherms such as Langmuir, Frumkin, Temkin and Freundlich isotherm. The Temkin isotherm shows the best fit for adsorption isotherm with R² of 0.97.

 

Keywords:  hydrate, corrosion, pH, conductivity, adsorption

 

Abstrak

Perencat hidrat gas (GHI) dan perencat kakisan (CI) sering menunjukkan kecenderungan antagonistik dalam penjaminan aliran minyak dan gas. GHI dan CI yang tidak mempunyai kompromi ialah masih dalam penyelidikan dan pembangunan. Penyelidikan terkini dilakukan pada perencat multifungsi (GHCl) yang boleh merencat hidrat dan kakisan. Gliserol telah diuji untuk prestasi perencatannya untuk hidrat dan kakisan dalam pelbagai eksperimen yang berbeza. Bagaimanapun, perencatan kakisan gliserol pada keluli lembut X52 dalam persekitaran air laut tidak pernah diuji. Dalam penyiasatan ini, sifat perencat kakisan gliserol pada keluli lembut X52 dalam larutan garam NaCl 3.5wt.% disiasat. Kepekatan gliserol yang digunakan ialah 400, 600, 800, 1000, 5000, dan 10000 ppm. Nilai pH dan konduktiviti gliserol telah diukur dan hubungan antara pH, konduktiviti dan kakisan telah dibincangkan dengan teliti. Prestasi gliserol telah dikaji lebih lanjut berdasarkan model isoterma penjerapan seperti model Langmuir, Frumkin, Temkin dan Freundlich. Model Temkin didapati paling sesuai untuk isoterma penjerapan dengan R², 0.97.

 

Kata kunci:  hidrat, kakisan, pH, konduktiviti, penjerapan

 

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