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<p>The selective fractionation of palm oil into olein and stearin remains a cornerstone in edible oil refining, yet its industrial potential is often constrained by the limitations of conventional dry fractionation methods. These approaches, though environmentally benign, typically yield only 60–70% of the desired phase due to viscosity-related inefficiencies during crystallization. This study introduces solvent-aided crystallization (SAC) as a process intensification strategy to overcome these barriers, with a particular focus on solvent selection and crystallization temperature optimization. Three solvents which are acetone, hexane, and 1-butanol were evaluated for their effectiveness in enhancing phase separation. Among them, 1-butanol emerged as the most effective, producing the highest olein yield (75.18%) at 18&#xa0;°C and the highest stearin yield (27.98%) at 10&#xa0;°C. Comprehensive analyses including iodine value, thermal behavior (DSC), fatty acid composition (GC–MS), and triglyceride distribution (HPLC–MS) confirm that lower crystallization temperatures enrich stearin with saturated triglycerides (TAGs), while higher temperatures favor unsaturated TAG retention in olein. These findings offer actionable insights for advancing SAC as a viable and scalable method for high-purity palm oil fractionation.</p>

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Unlocking high-purity olein and stearin: a solvent-aided crystallization approach to advanced palm oil fractionation

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Wan Nur Aisyah Wan Osman,
  • Song Xuan Looi,
  • Wan Nur Athirah Mazli,
  • Shafirah Samsuri

摘要

The selective fractionation of palm oil into olein and stearin remains a cornerstone in edible oil refining, yet its industrial potential is often constrained by the limitations of conventional dry fractionation methods. These approaches, though environmentally benign, typically yield only 60–70% of the desired phase due to viscosity-related inefficiencies during crystallization. This study introduces solvent-aided crystallization (SAC) as a process intensification strategy to overcome these barriers, with a particular focus on solvent selection and crystallization temperature optimization. Three solvents which are acetone, hexane, and 1-butanol were evaluated for their effectiveness in enhancing phase separation. Among them, 1-butanol emerged as the most effective, producing the highest olein yield (75.18%) at 18 °C and the highest stearin yield (27.98%) at 10 °C. Comprehensive analyses including iodine value, thermal behavior (DSC), fatty acid composition (GC–MS), and triglyceride distribution (HPLC–MS) confirm that lower crystallization temperatures enrich stearin with saturated triglycerides (TAGs), while higher temperatures favor unsaturated TAG retention in olein. These findings offer actionable insights for advancing SAC as a viable and scalable method for high-purity palm oil fractionation.