Natural Pectin and Commercial Luvicap-Bio as Green Kinetic Hydrate Inhibitors: A Comparative Evaluation by Crystal Growth Inhibition Methods

Morteza Aminnaji*, Ross Anderson, Khosro Jarrahian, Bahman Tohidi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
40 Downloads (Pure)

Abstract

Low dosage kinetic hydrate inhibitors (KHIs) are a cost-effective technique for the prevention of solid gas hydrate plug formation problems in the oil and gas industry. Although many commercial KHI polymers (e.g., poly-n-vinylcaprolactam, PVCap) have been used successfully in the field, in the past decade, considerable effort has been put into developing more eco-friendly KHIs due to environmental concerns around the non-biodegradability of traditional chemistries. Recently, natural pectina structural acidic heteropolysaccharide found in fruitshas been reported as a potential green KHI with good hydrate inhibition properties. In this work, crystal growth inhibition (CGI) methods have been used to assess the KHI performance of aqueous food grade apple pectin for pure methane and a multicomponent natural gas, with results compared to the commercial biodegradable KHI polymer Luvicap Bio. Results show that Luvicap Bio can offer significant inhibition to high subcoolings (e.g., 9.1 °C for the complete inhibition region in the natural gas system). In contrast, data show that pectin lacks the ability to significantly inhibit hydrate crystal growth, with it only showing some anti-nucleation properties, namely, through the ability to remove hydrate "history" (relic nuclei/water structuring). This "history removal" behavior highlights why it is crucial to ensure the presence of seeds (nuclei/water structures)and ideally viable hydrate crystalsahead of recooling cycles for the reliable assessment of KHIs by CGI type methods. An inadvertent lack of such "seeding" could potentially result in misleadingly strong apparent inhibition performance results, as recently found in related studies of some commercial KHIs.

Original languageEnglish
Pages (from-to)14898-14906
Number of pages9
JournalEnergy and Fuels
Volume36
Issue number24
Early online date1 Dec 2022
DOIs
Publication statusPublished - 15 Dec 2022

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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