Extraction of high-quality sunflower seed oil with carbon-dioxide expanded hexane for biofuel use

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-06-18 DOI:10.1016/j.supflu.2025.106702

Mapesa Kamisa Luhasile , Takeshi Sako , Haruka Sano , Yusuke Aoki , Mathayo Gervas Mathias , Idzumi Okajima

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Abstract

This study focuses on environmentally friendly technology for extracting sunflower seed oil utilizing CO₂-expanded hexane (CXH). The extraction conditions are optimized using response surface method, featuring a central composite rotatable design, at a pressure range of (4.5–6.5) MPa, temperature range of (20−30) ℃, and CO₂ mole fraction range of 0.70–0.88. The optimal extraction conditions using CXH are a pressure of 5.0 MPa, temperature of 25 ℃, and CO₂ mole fraction of 0.82, yielding 0.379 g-oil/g-sample with free fatty acid and phosphorus concentrations of 1.91 wt% and 7.2 µL/L, respectively. The response surface method model equations enable calculation of the oil yield and phosphorus concentration with an error ≤ 9 %. Comparison of CXH and liquid hexane oil extraction reveals that CXH achieves higher oil yield in shorter extraction time and higher-quality sunflower seed oil suitable for biofuel, meeting European standards without requiring extensive refining.

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用二氧化碳膨胀己烷萃取高品质葵花籽油用于生物燃料

研究了利用co2膨胀己烷（CXH）提取葵花籽油的环保工艺。采用响应面法，在压力（4.5 ~ 6.5）MPa、温度（20 ~ 30）℃、CO2摩尔分数0.70 ~ 0.88的条件下，采用中心复合旋转设计优化提取条件。CXH萃取的最佳条件为：压力5.0MPa，温度25℃，CO2摩尔分数0.82，得油量0.379 g /g，游离脂肪酸和游离磷浓度分别为1.91wt%和7.2µL/L。利用响应面法模型方程可以计算出含油量和磷浓度，误差≤9%。通过对CXH和液体己烷油提取工艺的比较，发现CXH在较短的提取时间内获得了较高的出油率，并获得了高质量的葵花籽油，适合用于生物燃料，无需大量精炼即可达到欧洲标准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.