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Owen J Catchpole - One of the best experts on this subject based on the ideXlab platform.
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extraction of lipids from new zealand fern fronds using near critical Dimethyl Ether and Dimethyl Ether water ethanol mixtures
Journal of Supercritical Fluids, 2021Co-Authors: Eduard V Nekrasov, Stephen Tallon, Mikhail Vyssotski, Owen J CatchpoleAbstract:Abstract Dimethyl Ether (DME), under near-critical conditions, can be used to extract lipids containing valuable fatty acids from wet biomass. In this work, DME, and a mixture of DME with a water–ethanol co-solvent, are used to extract fronds of the fern Cyathea dealbata, and the fatty acid composition of the extract was compared with the fern total lipids obtained by chloroform–methanol extraction. Total near-critical fluid extract yield was 6.3 weight % of the fronds with the recovery of 88–93% of the major fatty acids (18:3n-3, 16:0, 18:2n-6, 18:1n-9). The remaining residue contained
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extraction of lipids from new zealand fern fronds using near critical Dimethyl Ether and Dimethyl Ether water ethanol mixtures
Journal of Supercritical Fluids, 2021Co-Authors: Eduard V Nekrasov, Stephen Tallon, Mikhail Vyssotski, Owen J CatchpoleAbstract:Abstract Dimethyl Ether (DME), under near-critical conditions, can be used to extract lipids containing valuable fatty acids from wet biomass. In this work, DME, and a mixture of DME with a water–ethanol co-solvent, are used to extract fronds of the fern Cyathea dealbata, and the fatty acid composition of the extract was compared with the fern total lipids obtained by chloroform–methanol extraction. Extraction was carried out by circulating DME through a packed bed of milled undried fern material at pressure of 4.0 MPa, temperature of 58 °C, flow rate of 13.6 kg per kg undried fern material per hour, for 60 min followed by extraction using DME with addition of 5 wt% of a 70% ethanol in water co-solvent mixture until 572 g of co-solvent had been introduced. The total combined yield of DME and DME–ethanol–water extracts was 6.3 wt% of the fronds with the recovery of 88–93% of the major fatty acids (18:3n-3, 16:0, 18:2n-6, 18:1n-9). The remaining residue contained
Yannick Geboes - One of the best experts on this subject based on the ideXlab platform.
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lone pair π interactions involving an aromatic π system complexes of hexafluorobenzene with Dimethyl Ether and trimethylamine
Chemical Physics Letters, 2016Co-Authors: Yannick Geboes, Frank De Proft, Wouter A HerreboutAbstract:Abstract The formation of complexes between hexafluorobenzene and the Lewis bases Dimethyl Ether, Dimethyl Ether-d 6 , trimethylamine and trimethylamine-d 9 was investigated experimentally using FTIR spectroscopy on solutions of liquid krypton. Additional bands found in the spectra of mixtures were assigned to lone pair···π complexes using ab initio calculations at the MP2/aug-cc-pVDZ level. By constructing Van ‘t Hoff plots, experimental complexation enthalpies were determined of −6.0(6) kJ mol −1 for the complex with Dimethyl Ether(-d 6 ) and −6.7(9) kJ mol −1 for the complex with trimethylamine(-d 9 ). These values are in good agreement with calculated enthalpy values.
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competition of c sp2 x o halogen bonding and lone pair π interactions cryospectroscopic study of the complexes of c2f3x x f cl br and i and Dimethyl Ether
Journal of Physical Chemistry A, 2015Co-Authors: Yannick Geboes, Frank De Proft, Nick Nagels, Balazs Pinter, Wouter A HerreboutAbstract:Inspection of the electrostatic potential of C2F3X (X = F, Cl, Br, and I) revealed a second electropositive region in the immediate vicinity of the C═C double bond apart from the σ hole of chlorine, bromine, and iodine, leading to C(sp(2))-X···Y halogen bonding, through which complexes stabilized by so-called lone pair···π interactions can be formed. Consequently, the experimental studies for the complexes of Dimethyl Ether with C2F3X (X = F, Cl, Br, and I) not only allowed one to experimentally characterize and rationalize the effects of hybridization on halogen bonding but, for the first time, also allowed the competition of C-X···Y halogen bonding and lone pair···π interactions to be studied at thermodynamic equilibrium. Analysis of the infrared and Raman spectra reveals that in the cryosolutions of Dimethyl Ether and C2F3I, solely the halogen-bonded complex is present, whereas C2F3Br and C2F3Cl give rise to a lone pair···π bonded complex as well as a halogen-bonded complex. Mixtures of Dimethyl Ether with C2F4 solely yield a lone pair···π bonded complex. The experimentally derived complexation enthalpies for the halogen bonded complexes are found to be -14.2(5) kJ mol(-1) for C2F3I·DME and -9.3(5) kJ mol(-1) for C2F3Br·DME. For the complexes of C2F3Cl with Dimethyl Ether, no experimental complexation enthalpy could be obtained, whereas the C2F4·DME complex has a complexation enthalpy of -5.5(3) kJ mol(-1). The observed trends have been rationalized with the aid of an interaction energy decomposition analysis (EDA) coupled to a Natural Orbital for Chemical Valence (NOCV) analysis and also using the noncovalent interaction index method.
Hisao Makino - One of the best experts on this subject based on the ideXlab platform.
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oil recovery from wet euglena gracilis by shaking with liquefied Dimethyl Ether
Fuel Processing Technology, 2016Co-Authors: Kiyoshi Sakuragi, Peng Li, Nobuo Aoki, Maromu Otaka, Hisao MakinoAbstract:Abstract An efficient, safe, and low-cost method for recovering oil from microalgae is needed for the production of algae biofuels. Here, we report a one-step method for the recovery of oil from algae. Wet Euglena gracilis cells were placed in a vessel, mixed with liquefied Dimethyl Ether, and shaken at room temperature (20 °C). After 5 min of shaking, approximately 96.7% of the total oil was recovered when the ratio of solvent to sample (wet basis) was 8:1. The molecular weight distribution of oil recovered using this method was comparable to that of oil recovered using the conventional n -hexane Soxhlet extraction method. These results showed that it is possible to produce oil from wet microalgae by using a simple, economical, and environmentally friendly method.
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oil recovery from wet euglena gracilis by shaking with liquefied Dimethyl Ether
Fuel Processing Technology, 2016Co-Authors: Kiyoshi Sakuragi, Nobuo Aoki, Maromu Otaka, Hisao MakinoAbstract:Abstract An efficient, safe, and low-cost method for recovering oil from microalgae is needed for the production of algae biofuels. Here, we report a one-step method for the recovery of oil from algae. Wet Euglena gracilis cells were placed in a vessel, mixed with liquefied Dimethyl Ether, and shaken at room temperature (20 °C). After 5 min of shaking, approximately 96.7% of the total oil was recovered when the ratio of solvent to sample (wet basis) was 8:1. The molecular weight distribution of oil recovered using this method was comparable to that of oil recovered using the conventional n -hexane Soxhlet extraction method. These results showed that it is possible to produce oil from wet microalgae by using a simple, economical, and environmentally friendly method.
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energy saving lipid extraction from wet euglena gracilis by the low boiling point solvent Dimethyl Ether
Energies, 2015Co-Authors: Hideki Kanda, Motonobu Goto, Hisao MakinoAbstract:We tested a wet extraction method for lipid extraction from Euglena gracilis water slurry at 0.51 MPa and 20 °C using liquefied Dimethyl Ether (DME). The yields, proximate analyses, elemental composition, and molecular weight distribution properties of the extracts from E. gracilis and the remaining residues obtained by DME extraction were compared with those of the extracts obtained by hexane Soxhlet extraction.
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sewage sludge dewatering process using liquefied Dimethyl Ether as solid fuel
Drying Technology, 2011Co-Authors: Kazuyuki Oshita, Masaki Takaoka, Yusuke Nakajima, Shinsuke Morisawa, Hideki Kanda, Hisao Makino, Nobuo TakedaAbstract:This article describes the dewatering of sewage sludge using liquefied Dimethyl Ether (DME), which clarified the effect of sludge type and its particle size. Changes in the heating value of the dewatered sludge were also examined. In addition, the change in dewaterability upon reuse of the liquefied DME was investigated experimentally. Regardless of the nature of the sludge, its dewatering behavior was similar. The amount of dewatered water could be increased by decreasing the diameter of the sludge cake. Complete drying of the sludge cake via DME dewatering resulted in retention of approximately 96% of the heating value (17.7 MJ/kg-sludge) of the original sludge cake dry base (18.4 MJ/kg db). The DME could be recovered after extraction, and reuse experiments showed that liquefied DME dewatering performance was unchanged after five reuses.
Eduard V Nekrasov - One of the best experts on this subject based on the ideXlab platform.
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extraction of lipids from new zealand fern fronds using near critical Dimethyl Ether and Dimethyl Ether water ethanol mixtures
Journal of Supercritical Fluids, 2021Co-Authors: Eduard V Nekrasov, Stephen Tallon, Mikhail Vyssotski, Owen J CatchpoleAbstract:Abstract Dimethyl Ether (DME), under near-critical conditions, can be used to extract lipids containing valuable fatty acids from wet biomass. In this work, DME, and a mixture of DME with a water–ethanol co-solvent, are used to extract fronds of the fern Cyathea dealbata, and the fatty acid composition of the extract was compared with the fern total lipids obtained by chloroform–methanol extraction. Total near-critical fluid extract yield was 6.3 weight % of the fronds with the recovery of 88–93% of the major fatty acids (18:3n-3, 16:0, 18:2n-6, 18:1n-9). The remaining residue contained
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extraction of lipids from new zealand fern fronds using near critical Dimethyl Ether and Dimethyl Ether water ethanol mixtures
Journal of Supercritical Fluids, 2021Co-Authors: Eduard V Nekrasov, Stephen Tallon, Mikhail Vyssotski, Owen J CatchpoleAbstract:Abstract Dimethyl Ether (DME), under near-critical conditions, can be used to extract lipids containing valuable fatty acids from wet biomass. In this work, DME, and a mixture of DME with a water–ethanol co-solvent, are used to extract fronds of the fern Cyathea dealbata, and the fatty acid composition of the extract was compared with the fern total lipids obtained by chloroform–methanol extraction. Extraction was carried out by circulating DME through a packed bed of milled undried fern material at pressure of 4.0 MPa, temperature of 58 °C, flow rate of 13.6 kg per kg undried fern material per hour, for 60 min followed by extraction using DME with addition of 5 wt% of a 70% ethanol in water co-solvent mixture until 572 g of co-solvent had been introduced. The total combined yield of DME and DME–ethanol–water extracts was 6.3 wt% of the fronds with the recovery of 88–93% of the major fatty acids (18:3n-3, 16:0, 18:2n-6, 18:1n-9). The remaining residue contained
Wouter A Herrebout - One of the best experts on this subject based on the ideXlab platform.
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lone pair π interactions involving an aromatic π system complexes of hexafluorobenzene with Dimethyl Ether and trimethylamine
Chemical Physics Letters, 2016Co-Authors: Yannick Geboes, Frank De Proft, Wouter A HerreboutAbstract:Abstract The formation of complexes between hexafluorobenzene and the Lewis bases Dimethyl Ether, Dimethyl Ether-d 6 , trimethylamine and trimethylamine-d 9 was investigated experimentally using FTIR spectroscopy on solutions of liquid krypton. Additional bands found in the spectra of mixtures were assigned to lone pair···π complexes using ab initio calculations at the MP2/aug-cc-pVDZ level. By constructing Van ‘t Hoff plots, experimental complexation enthalpies were determined of −6.0(6) kJ mol −1 for the complex with Dimethyl Ether(-d 6 ) and −6.7(9) kJ mol −1 for the complex with trimethylamine(-d 9 ). These values are in good agreement with calculated enthalpy values.
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competition of c sp2 x o halogen bonding and lone pair π interactions cryospectroscopic study of the complexes of c2f3x x f cl br and i and Dimethyl Ether
Journal of Physical Chemistry A, 2015Co-Authors: Yannick Geboes, Frank De Proft, Nick Nagels, Balazs Pinter, Wouter A HerreboutAbstract:Inspection of the electrostatic potential of C2F3X (X = F, Cl, Br, and I) revealed a second electropositive region in the immediate vicinity of the C═C double bond apart from the σ hole of chlorine, bromine, and iodine, leading to C(sp(2))-X···Y halogen bonding, through which complexes stabilized by so-called lone pair···π interactions can be formed. Consequently, the experimental studies for the complexes of Dimethyl Ether with C2F3X (X = F, Cl, Br, and I) not only allowed one to experimentally characterize and rationalize the effects of hybridization on halogen bonding but, for the first time, also allowed the competition of C-X···Y halogen bonding and lone pair···π interactions to be studied at thermodynamic equilibrium. Analysis of the infrared and Raman spectra reveals that in the cryosolutions of Dimethyl Ether and C2F3I, solely the halogen-bonded complex is present, whereas C2F3Br and C2F3Cl give rise to a lone pair···π bonded complex as well as a halogen-bonded complex. Mixtures of Dimethyl Ether with C2F4 solely yield a lone pair···π bonded complex. The experimentally derived complexation enthalpies for the halogen bonded complexes are found to be -14.2(5) kJ mol(-1) for C2F3I·DME and -9.3(5) kJ mol(-1) for C2F3Br·DME. For the complexes of C2F3Cl with Dimethyl Ether, no experimental complexation enthalpy could be obtained, whereas the C2F4·DME complex has a complexation enthalpy of -5.5(3) kJ mol(-1). The observed trends have been rationalized with the aid of an interaction energy decomposition analysis (EDA) coupled to a Natural Orbital for Chemical Valence (NOCV) analysis and also using the noncovalent interaction index method.