Evaluation of tetradecyl methacrylate-hydroxyethyl methacrylate copolymers and their synergies with other polymeric pour point depressants to improve cold flow properties of biodiesel blends
Evaluation of tetradecyl methacrylate-hydroxyethyl methacrylate copolymers and their synergies with other polymeric pour point depressants to improve cold flow properties of biodiesel blends
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DOI：
10.1016/j.indcrop.2022.115947
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发表时间：
2023-02
影响因子：
5.9
通讯作者：
Yalian Chen;N. Shi;Yuan Xue;Hua-lin Lin;Jinchan Yan;Chenchen Wang;Shengxia Han
中科院分区：
文献类型：
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作者：
Yalian Chen;N. Shi;Yuan Xue;Hua-lin Lin;Jinchan Yan;Chenchen Wang;Shengxia Han
生物柴油与石化柴油共混是缓解全球石化能源短缺的有效方法，但生物柴油与柴油共混物冷流动性能差一直阻碍着其应用。为了解决这一问题，合成了一系列不同摩尔比的甲基丙烯酸酯-甲基丙烯酸羟乙酯共聚物（rmmc - hema， R= -C12, -C14, -C16, -C18）作为B20 （20 vol%柴油+ 80 vol%柴油）的降凝剂。C14MC-HEMA（9:1）在1000 ppm时表现出较好的冷流性能，使B20的固相点（SP）和冷过滤点（CFPP）分别降低14℃和6℃。将聚α -烯烃（PAO）和乙烯-醋酸乙烯共聚物（EVA）两种聚合物作为助剂，以不同质量比与C14MC-HEMA（9:1）结合，得到效率更高的ppd。结果表明，当C14MC-HEMA（9:1）与PAO的质量比为5:1时，B20的SP和CFPP在1000 ppm下分别降低了18℃和14℃。与单一C14MC-HEMA（9:1）相比，SP和CFPP分别降低了4°C和8°C。随后，通过偏光显微镜、差示扫描量热仪和粘温曲线，探讨这些PPDs改善B20冷流动流动性的抗凝机制。
Blending biodiesel with petrochemical diesel is an effective method to alleviate the global petrochemical energy shortage, but the application of biodiesel-diesel blends is always hindered by the worse cold flow properties. To resolve this issue, a series of methacrylate-hydroxyethyl methacrylate copolymers (RMC-HEMA, R= -C12, -C14, -C16, -C18) with different molar ratios were synthesized as pour point depressants (PPDs) for B20 (20 vol% biodiesel + 80 vol% diesel). C14MC-HEMA (9:1) showed better cold flow performance at 1000 ppm, reducing the solid point (SP) and cold filter point (CFPP) of B20 by 14 °C and 6 °C, respectively. To obtain higher-efficiency PPDs, two polymers of poly alpha olefin (PAO) and ethylene vinyl acetate copolymer (EVA), as the assistants, were combined with C14MC-HEMA (9:1) in different mass ratios. Results showed that when the weight ratio of C14MC-HEMA (9:1) to PAO was 5:1, the SP and CFPP of B20 decreased by 18 °C and 14 °C at 1000 ppm. Compared to the single C14MC-HEMA (9:1), the SP and CFPP were decreased by 4 °C and 8 °C, respectively. Subsequently, polarizing optical microscopy, differential scanning calorimeter and viscosity-temperature curves were conducted to explore the anti-coagulating mechanism of these PPDs in improving the cold flow fluidity of B20.