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Functionalized Superparamagnetic Iron Oxide Nanoparticles as a Sustainable Approach for Gas Hydrate Control
Ali H Karaly1, Malcolm A Kelland1, Mohamed F Mady2
1Department of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Stavanger N-4036, Norway.
ACS Omega
|June 9, 2025
Summary
This study introduces recyclable magnetic kinetic hydrate inhibitors (KHIs) for preventing gas hydrate blockages in oil and gas flow lines. These novel magnetic KHIs can be recovered and reused, offering a sustainable solution to reduce environmental discharge.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Gas hydrate blockages in multiphase flow lines pose significant challenges in upstream operations.
- Current kinetic hydrate inhibitors (KHIs) often exhibit poor marine biodegradability, hindering their recovery and recycling.
- Operational costs and environmental concerns necessitate sustainable alternatives for hydrate inhibition.
Purpose of the Study:
- To develop and evaluate novel magnetic kinetic hydrate inhibitors (KHIs) for effective and recyclable hydrate inhibition.
- To demonstrate the feasibility of recovering and reusing KHIs attached to magnetic nanoparticles without performance loss.
- To assess the performance of magnetic KHIs in preventing gas hydrate formation in multiphase flow lines.
Main Methods:
- Superparamagnetic iron oxide nanoparticles (SPIONs) were synthesized and functionalized with vinyltrimethoxysilane (VTMS).
- SPIONs were coated with N-vinylpyrrolidone/N-vinyl caprolactam (VP/VCap) copolymer chains via radical polymerization, creating SPIONs-VTMS-VPVCap.
- High-pressure tests were conducted to evaluate the hydrate inhibition performance and recyclability of the magnetic KHIs.
Main Results:
- The developed SPIONs-VTMS-VPVCap nanoparticles (10 nm particle size, 205 nm dispersion size) showed stability in aqueous solutions.
- Magnetic KHIs performed comparably to free copolymers, achieving a hydrate formation onset temperature (To) of 12.9 °C at 5000 ppm.
- Successful recovery and multiple reuse of magnetic KHIs were achieved without compromising performance. The addition of n-butyl glycol ether (BGE) further enhanced inhibition.
Conclusions:
- Recyclable magnetic KHIs offer a sustainable and effective solution for preventing gas hydrate blockages in multiphase flow lines.
- This approach minimizes environmental discharge by enabling the recovery and reuse of chemical inhibitors.
- The developed magnetic KHIs represent a significant advancement in eco-friendly upstream oil and gas operations.
