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Highly Efficient Deacidification Process for Camelina sativa Crude Oil by Molecular Distillation

Author

Listed:
  • Nicoleta Gabriela Ştefan

    (Department of Chemical and Biochemical Engineering, University POLITEHNICA of Bucharest, 1 Polizu Street, 011061 Bucharest, Romania)

  • Petrica Iancu

    (Department of Chemical and Biochemical Engineering, University POLITEHNICA of Bucharest, 1 Polizu Street, 011061 Bucharest, Romania)

  • Valentin Pleșu

    (Department of Chemical and Biochemical Engineering, University POLITEHNICA of Bucharest, 1 Polizu Street, 011061 Bucharest, Romania)

  • Ioan Călinescu

    (Department of Bioresources and Polymer Science, University POLITEHNICA of Bucharest, 1 Polizu Street, 011061 Bucharest, Romania)

  • Nicoleta Daniela Ignat

    (Department of Economical Engineering, University POLITEHNICA of Bucharest, 313 Splaiul Independentei Street, 060042 Bucharest, Romania)

Abstract

Recovery and reuse of high-acidity vegetable oil waste (higher content of free fatty acids) is a major concern for reducing their effect on the environment. Moreover, the conventional deacidification processes are known to show drawbacks, such as oil losses or higher costs of wastewater treatment, for which it requires great attention, especially at the industrial scale. This work presents the design of a highly efficient and sustainable process for Camelina sativa oil deacidification by using an ecofriendly method, namely molecular distillation. Experimental studies were performed to identify operating conditions for removing of free fatty acids (FFA) by molecular distillation which involves the oil evaporation in high vacuum conditions. The experimental studies were supported by statistical analysis and technical-economic analysis. Response surface methodology (RSM) was employed to formulate and validate second-order models to predict deacidification efficiency, FFA concentration, and triacylglyceride (TAG) concentration in deodorized oil based on three parameters effects, validated by statistical p -value < 0.05. For a desirability function value of 0.9826, the optimal parameters of evaporator temperature at 173.5 °C, wiper speed at 350 rpm, and feed flowrate at 2 mL/min were selected. The results for process design at optimal conditions (using conventional and molecular distillation methods) showed an efficiency over 92%, a significant reduction in FFA (up to 1%), and an increase in TAG (up to 93%) in refined oil for both methods. From an economical point of view, the deacidification by molecular distillation of Camelina sativa oil is a sustainable process: no wastewater generation, no solvents and water consumption, and lower production costs, obtaining a valuable by-product (FFA).

Suggested Citation

  • Nicoleta Gabriela Ştefan & Petrica Iancu & Valentin Pleșu & Ioan Călinescu & Nicoleta Daniela Ignat, 2021. "Highly Efficient Deacidification Process for Camelina sativa Crude Oil by Molecular Distillation," Sustainability, MDPI, vol. 13(5), pages 1-18, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:5:p:2818-:d:511194
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    References listed on IDEAS

    as
    1. Jack P. C. Kleijnen, 2015. "Response Surface Methodology," International Series in Operations Research & Management Science, in: Michael C Fu (ed.), Handbook of Simulation Optimization, edition 127, chapter 0, pages 81-104, Springer.
    2. Francesco Barreca & Pasquale Praticò, 2019. "Assessment of Passive Retrofitting Strategies to Improve the Thermal Performance of Extra-Virgin Olive Oil Storage Area in Traditional Rural Olive Mills," Sustainability, MDPI, vol. 12(1), pages 1-11, December.
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