Guanidine as a Starting Material for Preparing a Scale Inhibitor

Year : 2026 | Volume : 16 | Issue : 01 | Page : 15 28
    By

    Othman O. Dakhil*,

  • Khaled A. Saleh,

  • Abdulqader A. Imrage,

  • Mahjoub A.M. Elaoud,

  1. Professor, Department of Pharmaceutical Chemistry, University of Benghazi, Benghazi, Libya
  2. Teacher, Department of Chemistry, Libyan Academy, Benghazi, Libya
  3. Professor, Department of Chemistry, University of Benghazi, Benghazi, Libya
  4. Engineer, Al-Jouf Oil Technology Company, Benghazi, Libya

Abstract

Oilfield scale inhibition, which can obstruct fluid flow in pipelines, valves, and pumps during oil production and processing, is critical for preventing scale formation. Effective scale inhibitors (SIs) minimize downtime and enhance productivity by preventing the build-up of insoluble crystals in water systems. In oil processing, scale formation results from the precipitation of salts due to incompatible aqueous phases, leading to equipment blockage. Phosphonates are highly effective chelating agents for divalent and trivalent metal ions, capable of inhibiting crystal growth and scale formation under extreme conditions, such as high temperatures and fluctuating pH levels. These properties make them valuable in oilfields, cooling systems, desalination, pulp, paper, textiles, and detergents, where they function as SIs, chelating agents, and bleach stabilizers. In this study, ((1-methyl-3,3-bis(phosphonomethyl)guanidino) methyl) phosphonic acid was synthesized, and its effectiveness in reducing scale deposition in pipelines was evaluated. The compound chelates metal ions and inhibits crystal growth. Guanidine was selected as the starting material owing to its potential for phosphonate substitution. Although the initial aim was to introduce five phosphonate groups, steric hindrance and nitrogen bond stability resulted in the successful incorporation of these three groups. The structures and compositions of the synthesized compounds were confirmed by NMR, FT-IR, and mass spectrometry. Further evaluation of its scale inhibition efficiency will provide insights into its potential as an advanced inhibitor in oilfield applications.

Keywords: Desalination, guanidine, oilfield scaling, phosphonates, scale inhibitor

[This article belongs to Journal of Petroleum Engineering & Technology ]

How to cite this article:
Othman O. Dakhil*, Khaled A. Saleh, Abdulqader A. Imrage, Mahjoub A.M. Elaoud. Guanidine as a Starting Material for Preparing a Scale Inhibitor. Journal of Petroleum Engineering & Technology. 2026; 16(01):15-28.
How to cite this URL:
Othman O. Dakhil*, Khaled A. Saleh, Abdulqader A. Imrage, Mahjoub A.M. Elaoud. Guanidine as a Starting Material for Preparing a Scale Inhibitor. Journal of Petroleum Engineering & Technology. 2026; 16(01):15-28. Available from: https://journals.stmjournals.com/jopet/article=2026/view=239489


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Regular Issue Subscription Original Research
Volume 16
Issue 01
Received 10/01/2026
Accepted 22/01/2026
Published 19/02/2026
Publication Time 40 Days
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