Preparation of Chloromethylated Pitch–Based Hyper–Crosslinked Polymers and An Immobilized Acidic Ionic Liquid as A Catalyst for the Synthesis of Biodiesel

Catalysts

Ting Liu¹  Chaoyang Zhao¹  Rongxing Qiu¹  Xiaoyan Chen²  Jinqing Lin²  Xiaoyan Xiang²  Baoyou Pei²  Xiaoyan Luo²  Dongliang Li³ 

[1] College of Chemical Engineering, Huaqiao University, Xiamen 361021, China;College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China;School of foreign languages, Xinyu University, Xinyu 338000, China;

关键词: immobilized acidic ionic liquid;    hyper-crosslinked polymers;    pitch;    catalyst;    biodiesel;   

DOI  :  10.3390/catal9110963

来源: DOAJ

【 摘 要 】

Hyper-crosslinking polymers and its immobilized acid ionic liquid catalyst were prepared using cheap pitch, as a monomer, through hyper-crosslinking reactions and allyl chloride, as a chlorine source, for chloromethylation and further grafting with imidazole and functionalizing with sulfonic acid. The polymers were characterized by FE-SEM, FTIR, TG, and nitrogen sorption. The grafting ratios of the chloromethylated pitch-based hyper-crosslinked polymer (HCP_pitch−CH₂−Cl) and immobilized acid ionic liquid [HCP_pitch−Im−Pros][Tos] were 3.5 mmol/g and 3.0 mmol/g, and the BET specific surface areas were 520 m²/g and 380 m²/g, respectively. This strategy provides an easy approach to preparing highly stable and acid functionalized mesoporous catalysts. The immobilized acidic ionic liquid was used as a catalyst for the esterification of oleic acid and methanol to synthesize biodiesel. The results demonstrated that under the optimal conditions of an alcohol to acid molar ratio of 7:1, ionic liquid to oleic acid molar ratio of 0.12, and a reaction time of 3 h at atmospheric pressure, the yield of methyl oleate can reach up to 93%. Moreover, the catalyst was reused five times without the yield decreasing significantly. This study shows that [HCP_pitch−Im−Pros][Tos] is a robust catalyst for the synthesis of biodiesel.

【 授权许可】

Unknown