The feasibility of surfactants for enhancement of extraction efficiencies in wet oil extraction through an acidic hydrothermal process was evaluated. Three different types of surfactants were tested: anionic (SDBS and SDS), cationic (CTAB and MBC), and non-ionic (IGEPAL CA-210 and Tween 60). The total fatty acid content of Chlorella vulgaris was 291.0 mg/g cell. Under the no-surfactant condition, the oil-extraction yield of the acidic hydrothermal extraction was 75.5%. The addition of SDBS and MBC at the 0.4% concentration showed enhanced oil-extraction performance, 85.4 and 85.7% yields, respectively. CTAB and Tween 60 showed low extraction yields, less than 43.0%. SDS and IGEPAL CA-210 showed high oil-extraction yields, higher, in fact, than the initial fatty acid content, due to surfactant partitioning into microalgal oil. With increasing surfactant concentration, the oil-extraction yields of CTAB decreased, those of IGEPAL CA-210 gradually increased, and those of SDBS increased and then decreased again. The best performance, an oil-extraction yield of 95.6%, was observed under the 0.2% SDBS, 120 °C, 1 h condition. Although IGEPAL CA-210 showed the high net oil-extraction yield of 98.3% at the 0.6% surfactant concentration, 61.2% of surfactant was partitioned into oil.

评估了表面活性剂通过酸性水热法提高湿油萃取效率的可行性。测试了三种不同类型的表面活性剂：阴离子型（SDBS和SDS），阳离子型（CTAB和MBC）和非离子型（IGEPAL CA-210和Tween 60）。小球藻的总脂肪酸含量是291.0 mg / g细胞。在无表面活性剂条件下，酸性水热萃取的出油率为75.5％。以0.4％的浓度添加SDBS和MBC表现出更高的吸油性能，产率分别为85.4和85.7％。CTAB和Tween 60提取率低，低于43.0％。由于表面活性剂分配到微藻油中，SDS和IGEPAL CA-210的抽油产率高，实际上比初始脂肪酸含量高。随着表面活性剂浓度的增加，CTAB的出油率下降，IGEPAL CA-210的出油率逐渐升高，SDBS的出油率先升高后降低。在0.2％SDBS，120°C和1 h的条件下，观察到最佳性能，抽油产率为95.6％。