Sulfonated chitosan as green and high cloud point kinetic methane hydrate and corrosion inhibitor: Experimental and theoretical studies

Abdolreza Farhadian; Mikhail A Varfolomeev; Alireza Shaabani; Saeed Nasiri; Iskander Vakhitov; Yulia F Zaripova; Vladimir V Yarkovoi; Aleksander V Sukhov

doi:10.1016/j.carbpol.2020.116035

Sulfonated chitosan as green and high cloud point kinetic methane hydrate and corrosion inhibitor: Experimental and theoretical studies

Carbohydr Polym. 2020 May 15:236:116035. doi: 10.1016/j.carbpol.2020.116035. Epub 2020 Feb 20.

Authors

Abdolreza Farhadian¹, Mikhail A Varfolomeev², Alireza Shaabani³, Saeed Nasiri³, Iskander Vakhitov⁴, Yulia F Zaripova⁵, Vladimir V Yarkovoi⁵, Aleksander V Sukhov⁵

Affiliations

¹ Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation; Department of Physical Chemistry, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation; Research Center for Oil and Gas Exploration, Shahid Beheshti University, GC, 1983969411, Tehran, Iran.
² Department of Petroleum Engineering, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation; Department of Physical Chemistry, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation. Electronic address: mikhail.varfolomeev@kpfu.ru.
³ Department of Polymer & Materials Chemistry, Faculty of Chemistry and Petroleum Science, Shahid Beheshti University, GC, 1983969411, Tehran, Iran.
⁴ Institute of Physics, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation.
⁵ Department of Physical Chemistry, Kazan Federal University, Kremlevskaya Str. 18, 420008 Kazan, Russian Federation.

PMID: 32172851
DOI: 10.1016/j.carbpol.2020.116035

Abstract

In this work sulfonated chitosan (SCS) was introduced as a promising green kinetic methane hydrate and corrosion inhibitor to overcome the incompatibility problem between inhibitors. Evaluation of hydrate inhibition performance of SCS with high-pressure autoclave and micro-differential scanning calorimeter revealed that hydrate formation was delayed 14.3 ± 0.2 times and amount of hydrate formed was decreased to 30 % compared to water. The weight loss experiments showed that SCS provides corrosion inhibition efficiency of 95.6 ± 0.1 at 5000 ppm concentration. SCS is able to increase polarization resistance and decrease corrosion current density according to electrochemical measurements. Study of surface morphology by SEM-EDX and profilometer showed that SCSs suppress corrosion rate and reduce the surface roughness of carbon steel. Quantum chemical study confirmed that the pendant groups caused by chitosan modification interact with carbon steel surface. The findings of this research can provide new opportunities to develop biodegradable materials as KHIs/CIs for flow assurance in oil and gas pipelines.

Keywords: Corrosion inhibitor; Environmentally friendly; Flow assurance; High cloud point; High-pressure micro-differential scanning calorimetery; Hydrate inhibitor.