Abstract
Vegetable oils are well known for their potential applications in green chemistry, including use as hydraulic fluids. Among oilseed crops, Crambe abyssinica Hochst. EX R.E.Fr. gained attention for its low-input requirements during cultivation and for the properties of its oil, characterised by a high erucic acid content. This long-chain mono-unsaturated fatty acid provides appreciable features that make the oil suitable for interesting green chemistry sectors, as biolubricants and cosmetics. In the present work, Crambe oil was tested as a hydraulic fluid for sustainable agricultural applications. Crambe oil was partially refined through phospholipid removal and added with a food-grade antioxidant (tert-butylhydroquinone) at two different concentrations. The fluid efficiency tests were carried out using an experimental test rig, able to simulate a real hydraulic device, performing heavy work cycles at 40-MPa pressure and at 100 °C temperature, with the aim of strongly accelerating the ageing of the tested fluid. At a lower antioxidant concentration, 0.25 g kg−1, the oil underwent a very quick degradation process. However, increasing the additive dose to 2.0 g kg−1, the fluid maintained stable performances. Indeed, all parameters, referred to oil chemical-physical stability and technical performance, were constant along the entire work cycle, up to 290 h. Finally, the present work showed how Crambe seed cultivation, oil extraction and exploitation in the hydraulic circuit of farm machinery could be developed applying green chemistry approaches aiming at small-scale biorefineries linked to the local supply.
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Acknowledgments
We thank Nerio Casadei (CREA-CI) for supporting Crambe reproduction in Bologna and Crambe oil extraction and Stefano Benigni (CREA-IT) for technical support during the oil endurance tests.
Funding
This research has been carried out in the ambit of the AGROENER Research Project, WP4 – Integrated biorefineries in agro-food production chains, granted by MiPAAF, the Italian Ministry of Agriculture, Food and Forestry Policies (D.D. n. 26329).
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Fanigliulo, R., Pochi, D., Bondioli, P. et al. Semi-refined Crambe abyssinica (Hochst. EX R.E.Fr.) oil as a biobased hydraulic fluid for agricultural applications. Biomass Conv. Bioref. 13, 1859–1871 (2023). https://doi.org/10.1007/s13399-020-01213-y
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DOI: https://doi.org/10.1007/s13399-020-01213-y