Design and synthesis of novel Brønsted-Lewis acidic ionic liquid and its application in biodiesel production from soapberry oil. (15th June 2018)

• Record Type: Journal Article
• Authors: Cai, Dongren; Xie, Yiwei; Li, Ling; Ren, Jieyong; Lin, Xiaocheng; Qiu, Ting
• Is Part Of: Energy conversion and management. Volume 166(2018)
• Page Start: 318
• Page End: 327
• Publication Date: 2018-06-15
• Subjects: Biodiesel -- Soapberry oil -- Brønsted-Lewis acidic IL -- Molecular simulation -- Transesterification; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2018.04.036
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Molecular simulation was used for IL design. A series of Brønsted-Lewis acidic ILs were prepared for the first time. The new catalytic mechanism of Brønsted-Lewis acidic IL was clarified. The operating variables of process were optimized by Response surface methodology. Abstract: With the combination of molecular simulation and relevant experiments, the efficient Brønsted-Lewis acidic ionic liquid (IL) was designed and synthesized for biodiesel production from soapberry oil. In molecular simulation, 4-methylthiazole (MT) is proved to be the best matrix for IL preparation via electrostatic potential analysis and proton affinity analysis, and it also is verified by experiments. In orthogonal experiment, the relationship in catalytic activity between Brønsted-Lewis acidic IL and corresponding materials (Brønsted acidic IL and metal chloride) was revealed. Meanwhile, [Ps-MTH][CF3 SO3 ] and FeCl3 are verified as the best materials for preparation of Brønsted-Lewis acidic IL, and [Ps-MTH][CF3 SO3 ]-FeCl3 ( x = 0.65) is determined as the most efficient catalyst in the end. The Lewis acidity, Brønsted acidity and interaction of [Ps-MTH][CF3 SO3 ] and FeCl3 in [Ps-MTH][CF3 SO3 ]-FeCl3 ( x = 0.65) were characterized by FT-IR. And the catalytic mechanism of transesterification catalyzed by prepared IL was clarified. In order to maximize the biodiesel yield, optimization of process variables was conducted using Box-Behnken response surface methodology. The 97.04% of high biodiesel yield is obtained under the optimum conditions: reaction temperature was 127 °C, molar ratio (methanol to soapberry oil) was 27.96:1, catalyst amount was 3.06 mmol and reaction time was 8 h. Furthermore, [Ps-MTH][CF3 SO3 ]-FeCl3 ( x = 0.65) presents good catalytic activity in different transesterification for biodiesel production. And its catalytic activity decreases from 97.04% to 93.59% after being used for 5 times, which reflects good reusability. The main properties of soapberry biodiesel were also measured and compared to the ASTMD6751 standard.