Carboxymethylated lignins with low surface tension toward low viscosity and highly stable emulsions of crude bitumen and refined oils

Research output: Contribution to journalArticle

Researchers

Research units

  • North Carolina State University

Abstract

Kraft and organosolv lignins were subjected to carboxymethylation to produce fractions that were soluble in water, displayed a minimum surface tension as low as 34 mN/m (25 °C) and a critical aggregation concentration of ∼1.5 wt%. The carboxymethylated lignins (CML), which were characterized in terms of their degree of substitution (31P NMR), elemental composition, and molecular weight (GPC), were found suitable in the formulation of emulsions with bitumens of ultra-high viscosity, such as those from the Canadian oil sands. Remarkably, the interfacial features of the CML enabled fuel emulsions that were synthesized in a very broad range of internal phase content (30–70%). Cryo-replica transmission electron microscopy, which was used here the first time to assess the morphology of the lignin-based emulsions, revealed the droplets of the emulsion stabilized with the modified lignin. The observed drop size (diameters x and CO emissions and maintained a relatively high combustion efficiency. The results highlight the possibilities in high volume application for lignin biomacromolecules.

Details

Original languageEnglish
Pages (from-to)27-38
Number of pages12
JournalJournal of Colloid and Interface Science
Volume482
Publication statusPublished - 15 Nov 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Bitumen-in-water emulsion, Colloidal stability, Combustion efficiency, Exhaust emission, Fuel emulsions, High heating value, Lignin

ID: 6805965