Steam Distillation of Acidulated Soapstock and FAME Synthesis
Proceedings of the 7th World Congress on Civil, Structural, and Environmental Engineering (CSEE’22) 2022
Lauma Laipniece, Valdis Kampars

Use of rapeseed soapstock to produce biodiesel is a sustainable choice, because it deals with waste stream use in biofuel synthesis and lowers the use of food grade oil as fuel feedstock. Rapeseed soapstock was acidulated, and fatty acid and glycerides containing acid oil was separated from water phase. Steam distillation – a mild purification method – was used to separate fatty acids from acid oil. Distilled fatty acids were subjected to sulfuric acid catalyzed esterification with methanol. The chosen reaction conditions were: 65 °C temperature, molar ratio of MeOH to FFA 20:1, 7.5 mol% H2SO4, and a reaction time 1 h. Esterification of distilled fatty acids proceeded with 98.3–98.5% conversion to FAME and product yield 93–95% from theoretical. The esterification reaction conditions were determined using lauric acid as model compound, the catalyst concentration was adjusted to be less than usually reported, so to avoid oxidation and side reactions. Use of ultrasound assisted synthesis was elaborated by comparing reaction of lauric acid at 25 °C temperature in ultrasonic bath and with stirring. Reaction was faster with stirring than use of ultrasound.


Keywords
soapstock, biodiesel, fatty acids, esterification, steam distillation, ultrasound
DOI
10.11159/iceptp22.176
Hyperlink
https://avestia.com/CSEE2022_Proceedings/files/paper/ICEPTP/ICEPTP_176.pdf

Laipniece, L., Kampars, V. Steam Distillation of Acidulated Soapstock and FAME Synthesis. In: Proceedings of the 7th World Congress on Civil, Structural, and Environmental Engineering (CSEE’22), Online, Virtual Conference, 10-12 April, 2022. Orléans, Ontario: International ASET Inc., 2022, Paper No. ICEPTP 176. ISBN 978-1-927877-99-9. ISSN 2371-5294. Available from: doi:10.11159/iceptp22.176

Publication language
English (en)
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