Optimization of operation conditions for biodiesel preparation from soybean oil using an electric field
The acceleration of the biodiesel-glycerol separation has attracted the interest of many researchers in a quest to improve biodiesel production efficiency and reduce the overall production time. This has played a pivotal role in lowering the production cost and reducing the demand for other nonrenewable sources of energy. In the present study, the transesterification of soybean oil into biodiesel was done using methanol and sodium hydroxide (as a catalyst) under an applied electric field. Response surface methodology (RSM) via Box-Behnken design (BBD) was applied to evaluate the influences of transesterification response on the reaction parameters of biodiesel production. Analysis of variance (ANOVA) was adopted to investigate several parameters of the quadratic polynomial model. The optimum condition was found under an applied electric field of 5 kV at a catalyst concentration, molar ratio of methanol to oil, reaction temperature, and stirring rates of 1 wt.%, 6:1, 60 °C, and 450 rpm respectively. During the transesterification process, the biodiesel yield reached 96.85% within 180.0 s. This is a huge improvement as compared with the conventional biodiesel preparing method which takes more than 2 h to obtain similar biodiesel yield.
KeywordsElectric field Biodiesel Acceleration Soybean oil Optimization
This work was supported by the National Natural Science Foundation of China (51761145011). A special thanks to Prof. Dr. Tanongkiat Kiatsiriroat, Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University; for instructions to conduct this research.
- 20.Fadhil AB, Aziz AM, Al-Tamer MH (2016) Biodiesel production from Silybum marianum L. seed oil with high FFA content using sulfonated carbon catalyst for esterification and base catalyst for transesterification. Energy Convers Manag 108:255–265. https://doi.org/10.1016/j.enconman.2015.11.013 CrossRefGoogle Scholar
- 22.Abbaszadeh A, Ghobadian B, Najafi G (2013) High voltage/low amperage current for separation of crude glycerin from biodiesel. Adv Environ Biol 7(13):4028–4031. https://doi.org/10.4028/www.scientific.net/KEM.599.319 CrossRefGoogle Scholar
- 23.Shirazi MMA, Kargari A, Tabatabaei M, Mostafaeid B, Akia M, Barkhi M, Shirazi MJA (2013) Acceleration of biodiesel–glycerol decantation through NaCl-assisted gravitational settling: a strategy to economize biodiesel production. Bioresour Technol 134:401–406. https://doi.org/10.1016/j.biortech.2013.02.026 CrossRefGoogle Scholar
- 30.Wang D, Wang J, Liu H, Huo Y, Hu W (2019) Reaction kinetics of waste cooking oil transesterification under electric field. Waste Biomass Valori 1–10. https://doi.org/10.1007/s12649-019-00673-2
- 31.Montgomery DC (2012) Design and analysis of experiments. Wiley, New YorkGoogle Scholar
- 33.Ahmad T, Danish M, Kale P, Geremew B, Adeloju SB, Nizami M, Ayoub M (2019) Optimization of process variables for biodiesel production by transesterification of flaxseed oil and produced biodiesel characterizations. Renew Energy 139:1272–1280. https://doi.org/10.1016/j.renene.2019.03.036 CrossRefGoogle Scholar
- 37.Montgomery DC (2000) Design and analysis of experiments, 5th edition Wiley, New York Ch.6, Ch.8 and Ch.11Google Scholar