With a sizable market share and widespread use in automotive and industrial applications, biolubricants are produced from the oils of terrestrial plants that have undergone chemical modification or additive addition. Brackish or marine microalgae utilize less arable land and have a lower freshwater footprint compared to terrestrial plants. They are thus a potential source of raw materials for the production of biolubricants. This study screened eight marine microalgae, i.e., Coelastrella sp., Chlorocystis sp., Ceatocerous sp., Neochloris sp., Picochlorum sp., Tisochrysis sp., Tetraselmis sp., and Synechococcus sp. for their lipid and pigment content as a preliminary step. Coelastrella sp., Tetraselmis sp., and Chlorocystis sp. were chosen for additional study in outdoor cultivation based on total lipid, pigments, and harvestability. Coelastrella, Tetraselmis, and Chlorocystis species had total lipid contents of 50.2, 7.6, and 9.1% (w/w), respectively. In Coelastrella sp., total carotenoids, monounsaturated fatty acid (MUFA), polyunsaturated fatty acid (PUFA), and saturated fatty acid (SFA) concentrations were 0.3, 45.8, and 51%, respectively. Based on total carotenoids, polyunsaturated fatty acid, and lipid content, Coelastrella sp. was chosen to produce biolubricants by chemical modification and addition of its lipid. Kinematic viscosities and the viscosity index of the EVA-added Coelastrella sp. biolubricant were higher than those of the chemically produced Coelastrella TMP triesters. The thermal stability of the Coelastrella biolubricant with EVA additive was higher, whereas chemically synthesized TMP triester biolubricant had considerably lower thermal stability. A 1% increase in EVA reduced the coefficient of friction of SFA biolubricant from 0.075 to 0.03 and the wear rate from 12 μ gm N^–1 m^–1 to 0.6 μ gm N^–1 m^–1, resulting in 60% and 95% reduction in friction and wear rate, respectively, making it a potential lubricant basestock for a variety of industrial applications.

中文翻译：

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通过添加和化学改性从富含脂质的咸味 Coelastrella sp 中合成生物润滑剂。使用生物精炼方法

生物润滑剂是由经过化学改性或添加添加剂的陆地植物油生产而成，在汽车和工业应用中拥有相当大的市场份额和广泛使用。与陆地植物相比，咸水或海洋微藻占用的耕地较少，淡水足迹也较低。因此，它们是生产生物润滑剂的潜在原材料来源。本研究筛选了八种海洋微藻，即Coelastrella sp.、Chlorocystis sp.、Ceatocerous sp.、Neocilis sp.、Pico绿藻sp.、Tisochrysis sp.、Tetraselmis sp.和Synechococcus sp.。作为初步步骤，测定其脂质和色素含量。Coelastrella sp.、Tetraselmis sp. 和Chlorocystis sp.。根据总脂质、色素和可收获性，选择用于户外栽培的进一步研究。Coelastrella、Tetraselmis和Chlorocystis物种的总脂质含量分别为 50.2、7.6 和 9.1% (w/w)。在Coelastrella sp. 中，总类胡萝卜素、单不饱和脂肪酸 (MUFA)、多不饱和脂肪酸 (PUFA) 和饱和脂肪酸 (SFA) 浓度分别为 0.3%、45.8% 和 51%。根据总类胡萝卜素、多不饱和脂肪酸和脂质含量，Coelastrella sp.选择通过化学修饰和添加其脂质来生产生物润滑剂。添加 EVA 的Coelastrella sp 的运动粘度和粘度指数。生物润滑剂的含量高于化学生产的Coelastrella TMP 三酯。添加EVA添加剂的Coelastrella生物润滑剂的热稳定性较高，而化学合成的TMP三酯生物润滑剂的热稳定性则相当低。 EVA含量增加1%，SFA生物润滑剂的摩擦系数从0.075降低到0.03，磨损率从12 μ gm N ^–1 m ^–1降低到0.6 μ gm N ^–1 m ^–1，分别达到60%和95%分别降低摩擦和磨损率，使其成为各种工业应用的潜在润滑剂基础油。