Microwave-assisted pyrolysis of vegetable oil soapstock: Comparative study of rapeseed, sunflower, corn, soybean, rice, and peanut oil soapstock

Yunpu Wang, Shumei Zhang, Qiuhao Wu, Dengle Duan, Yuhuan Liu, Roger Ruan, Guiming Fu, Leilei Dai, Lin Jiang, Zhenting Yu, Zihong Zeng, Xiaojie Tian, Xiuhua Yang

Abstract


In this study, the effects of catalytic temperature and the type of soapstock on products from microwave-assisted pyrolysis were investigated. HZSM-5 was used as the catalyst to study the pyrolysis of six different soapstocks at 200°C, 300°C, and 400°C catalytic temperature. Results showed that the bio-oil yields initially increased and then decreased with the increase in catalytic temperature. When the catalytic temperature was 300°C, the bio-oil reached up to the maximum value (65.8 wt.%). Findings indicated that the composition of bio-oil was related to the degree of unsaturation of fatty acids sodium in the soapstocks. In the case of saturated fatty acid sodium, a series of alkanes was formed, whereas the pyrolysis of monounsaturated fatty acid sodium resulted mainly in cycloalkanes, the cycloalkenes obtained from bio-oil was produced by polyunsaturated fatty acid sodium.
Keywords: microwave pyrolysis vegetable oil soapstock, HZSM-5, bio-oil
DOI: 10.25165/j.ijabe.20191206.4599

Citation: Wang Y P, Zhang S M, Wu Q H, Duan D L, Liu Y H, Ruan R, et al. Microwave-assisted pyrolysis of vegetable oil soapstock: Comparative study of rapeseed, sunflower, corn, soybean, rice, and peanut oil soapstock. Int J Agric & Biol Eng, 2019; 12(6): 202–208.

Keywords


microwave pyrolysis vegetable oil soapstock, HZSM-5, bio-oil

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References


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