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Antonio J A Meirelles - One of the best experts on this subject based on the ideXlab platform.

  • deacidification of rice bran oil by Liquid Liquid Extraction using a renewable solvent
    Separation and Purification Technology, 2014
    Co-Authors: Christianne Elisabete Da Costa Rodrigues, Cintia B Goncalves, Elaine C Marcon, Eduardo A C Batista, Antonio J A Meirelles
    Abstract:

    Abstract The deacidification of rice bran oil by continuous Liquid–Liquid Extraction using aqueous ethanol as the solvent was investigated in a perforated rotating disc column (PRDC). The influence of partial acylglycerols and minor compounds, such as phosphorus and nutraceutical compounds, on the free fatty acid mass transfer was observed. The experimental results show that total deacidification by solvent Extraction is feasible. The losses in neutral oil, tocols and γ-oryzanol were significantly lower than those reported in the literature for alkali or physical refining of rice bran oil. A simulation of the Extraction process was also performed, and the simulated results were in good agreement with the experimental data.

  • optimization of the rice bran oil deacidification process by Liquid Liquid Extraction
    Journal of Food Engineering, 2006
    Co-Authors: Christianne Elisabete Da Costa Rodrigues, Marcia M Onoyama, Antonio J A Meirelles
    Abstract:

    Abstract The present paper reports the process variable influence on the losses/transfer of fatty compounds during the deacidification process of rice bran oil by Liquid–Liquid Extraction. The influence of process variables such as free fatty acid concentration in the oil, water content in the ethanolic solvent and oil:solvent mass ratio, were analyzed using the response surface methodology, having the aim to maximize the transfer of free fatty acids and minimize the losses of neutral oil plus minor compounds. In addition, the UNIQUAC equation was used to predict the transfer/losses of fatty and nutraceutical compounds to the alcohol phase. Both methodologies, the mathematical model from non-linear multiple regression and the UNIQUAC model, presented good agreement with the experimental data.

Yinglong Wang - One of the best experts on this subject based on the ideXlab platform.

  • dynamic control of hybrid processes with Liquid Liquid Extraction for propylene glycol methyl ether dehydration
    Industrial & Engineering Chemistry Research, 2018
    Co-Authors: Tingran Zhao, Jingwei Yang, Dongmei Xu, Yinglong Wang
    Abstract:

    Dynamic control structures are significant for Liquid–Liquid Extraction combined with heterogeneous azeotropic distillation (LEHAD) and Liquid–Liquid Extraction combined with extractive distillation (LEED) processes, which were proposed in our previous work for the separation of the azeotrope of propylene glycol methyl ether and water. However, there may be complications regarding the dynamic controllability of the two hybrid processes, and this work investigates the dynamic control structures. For the LEHAD process, an improved composition–temperature cascade control structure using the ratio of the reboiler duty to feed flow (QR/F) can realize effective control when feed disturbances are added. For the LEED process, the improved dual temperature control structure with QR/F was able to handle the disturbances well. Moreover, a comparison between the two hybrid processes was made according to the dynamic controllability, and the integral of the squared errors was calculated. The results show that the LEHA...

  • Dynamic Control of Hybrid Processes with Liquid–Liquid Extraction for Propylene Glycol Methyl Ether Dehydration
    2018
    Co-Authors: Tingra Zhao, Jingwei Yang, Zhaoyou Zhu, Yinglong Wang
    Abstract:

    Dynamic control structures are significant for Liquid–Liquid Extraction combined with heterogeneous azeotropic distillation (LEHAD) and Liquid–Liquid Extraction combined with extractive distillation (LEED) processes, which were proposed in our previous work for the separation of the azeotrope of propylene glycol methyl ether and water. However, there may be complications regarding the dynamic controllability of the two hybrid processes, and this work investigates the dynamic control structures. For the LEHAD process, an improved composition–temperature cascade control structure using the ratio of the reboiler duty to feed flow (QR/F) can realize effective control when feed disturbances are added. For the LEED process, the improved dual temperature control structure with QR/F was able to handle the disturbances well. Moreover, a comparison between the two hybrid processes was made according to the dynamic controllability, and the integral of the squared errors was calculated. The results show that the LEHAD process has better dynamic controllability than the LEED process

Christianne Elisabete Da Costa Rodrigues - One of the best experts on this subject based on the ideXlab platform.

  • deacidification of rice bran oil by Liquid Liquid Extraction using a renewable solvent
    Separation and Purification Technology, 2014
    Co-Authors: Christianne Elisabete Da Costa Rodrigues, Cintia B Goncalves, Elaine C Marcon, Eduardo A C Batista, Antonio J A Meirelles
    Abstract:

    Abstract The deacidification of rice bran oil by continuous Liquid–Liquid Extraction using aqueous ethanol as the solvent was investigated in a perforated rotating disc column (PRDC). The influence of partial acylglycerols and minor compounds, such as phosphorus and nutraceutical compounds, on the free fatty acid mass transfer was observed. The experimental results show that total deacidification by solvent Extraction is feasible. The losses in neutral oil, tocols and γ-oryzanol were significantly lower than those reported in the literature for alkali or physical refining of rice bran oil. A simulation of the Extraction process was also performed, and the simulated results were in good agreement with the experimental data.

  • optimization of the rice bran oil deacidification process by Liquid Liquid Extraction
    Journal of Food Engineering, 2006
    Co-Authors: Christianne Elisabete Da Costa Rodrigues, Marcia M Onoyama, Antonio J A Meirelles
    Abstract:

    Abstract The present paper reports the process variable influence on the losses/transfer of fatty compounds during the deacidification process of rice bran oil by Liquid–Liquid Extraction. The influence of process variables such as free fatty acid concentration in the oil, water content in the ethanolic solvent and oil:solvent mass ratio, were analyzed using the response surface methodology, having the aim to maximize the transfer of free fatty acids and minimize the losses of neutral oil plus minor compounds. In addition, the UNIQUAC equation was used to predict the transfer/losses of fatty and nutraceutical compounds to the alcohol phase. Both methodologies, the mathematical model from non-linear multiple regression and the UNIQUAC model, presented good agreement with the experimental data.

Christophe Bengoa - One of the best experts on this subject based on the ideXlab platform.

  • direct Liquid Liquid Extraction of lipid from municipal sewage sludge for biodiesel production
    Fuel Processing Technology, 2014
    Co-Authors: Magdalena Olkiewicz, M P Caporgno, A Fortuny, Frank Stuber, Azael Fabregat, Josep Font, Christophe Bengoa
    Abstract:

    Abstract Municipal sludge from wastewater treatment plants is a promising lipid feedstock for biodiesel production as it contains a significant amount of lipids. However, the energy necessary to remove its high water content is a major inconvenience for scaling up because of the high associated cost. In addition, the expensive conventional sludge drying methods are not effective enough for lipid recovery, thus reducing the potential biodiesel production. This study explores an alternative method, the direct sequential Liquid–Liquid Extraction, which was performed in a batch mixer–settler reactor at room temperature, using hexane as a solvent, after previous sludge acidification showed significant increase in the lipid efficiency. The optimisation study demonstrated that, after three stages, 91% of lipid from primary sludge was recovered. The optimised Extraction gave slightly higher lipid (27%, dry sludge) than the standard method (25%, dry sludge), supporting the suitability of the proposed process. Finally, this work demonstrates that the residual lipid-extracted sludge is still a good feedstock for energy production via anaerobic digestion. Anyway, the economic and environmental aspects of biodiesel production from sewage sludge could be improved.

  • direct Liquid Liquid Extraction of lipid from municipal sewage sludge for biodiesel production
    Fuel Processing Technology, 2014
    Co-Authors: Magdalena Olkiewicz, M P Caporgno, A Fortuny, Frank Stuber, Azael Fabregat, Josep Font, Christophe Bengoa
    Abstract:

    Municipal sludge from wastewater treatment plants is a promising lipid feedstock for biodiesel production as it contains a significant amount of lipids. However, the energy necessary to remove its high water content is a major inconvenience for scaling up because of the high associated cost. In addition, the expensive conventional sludge drying methods are not effective enough for lipid recovery, thus reducing the potential biodiesel production. This study explores an alternative method, the direct sequential Liquid-Liquid Extraction, which was performed in a batch mixer-settler reactor at room temperature, using hexane as a solvent, after previous sludge acidification showed significant increase in the lipid efficiency. The optimisation study demonstrated that, after three stages, 91% of lipid from primary sludge was recovered. The optimised Extraction gave slightly higher lipid (27%, dry sludge) than the standard method (25%, dry sludge), supporting the suitability of the proposed process. Finally, this work demonstrates that the residual lipid-extracted sludge is still a good feedstock for energy production via anaerobic digestion. Anyway, the economic and environmental aspects of biodiesel production from sewage sludge could be improved. (C) 2014 Elsevier B.V. All rights reserved.

Hero J Heeres - One of the best experts on this subject based on the ideXlab platform.

  • chiral separation by enantioselective Liquid Liquid Extraction
    Organic and Biomolecular Chemistry, 2011
    Co-Authors: Boelo Schuur, Bastiaan J V Verkuijl, Adriaan J Minnaard, Johannes G De Vries, Hero J Heeres, Ben L Feringa
    Abstract:

    The literature on enantioselective Liquid-Liquid Extraction (ELLE) spans more than half a century of research. Nonetheless, a comprehensive overview has not appeared during the past few decades. Enantioselective Liquid-Liquid Extraction is a technology of interest for a wide range of chemists and chemical engineers in the fields of fine chemicals, pharmaceuticals, agrochemicals, fragrances and foods. In this review the principles and advances of resolution through enantioselective Liquid-Liquid Extraction are discussed, starting with an introduction on the principles of enantioselective Liquid-Liquid Extraction including host-guest chemistry, Extraction and phase transfer mechanisms, and multistage Liquid-Liquid Extraction processing. Then the literature on enantioselective Liquid-Liquid Extraction systems is reviewed, structured on extractant classes. The following extractant classes are considered: crown ether based extractants, metal complexes and metalloids, extractants based on tartrates, and a final section with all other types of chiral extractants.

  • continuous chiral separation of amino acid derivatives by enantioselective Liquid Liquid Extraction in centrifugal contactor separators
    Organic Process Research & Development, 2008
    Co-Authors: Boelo Schuur, Joelle Floure, Andrew Jon Hallett, Jos Winkelman, De Johannes Vries, Hero J Heeres
    Abstract:

    The continuous enantioselective Liquid−Liquid Extraction of aqueous 3,5-dinitrobenzoyl-d,l-leucine (DNB-d,l-leu) by a cinchona alkaloid extractant (CA) in 1,2-dichloroethane using a centrifugal contact separator (CCS) was studied at 294 K. Typical concentrations were in the order of 1 mM for both DNB-d,l-leu and CA. The best results were found at a pH of 6, with 61% yield for DNB-l-leu and an enantiomeric excess of 34%. Back-Extraction studies at different pH values showed that the host can be recovered efficiently in a single CCS, provided that pH > 9. Experimental studies indicate that the CCS behaves as an equilibrium Extraction stage, even at total throughputs exceeding 50% of the equipment capacity (1.9 L min−1). A previously developed equilibrium stage Extraction model was successfully applied to describe the data for both the Extraction and the back-Extraction experiments.