The solubility of water in mixtures of dimethyl ether and carbon dioxide

Tallon, Stephen; Fenton, Kristina

doi:10.1016/j.fluid.2010.07.009

Cited by 37 publications

(20 citation statements)

References 30 publications

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“…In addition, DME is a gas under ambient conditions; thus, it can be easily liquefied at 0.51–0.59 MPa and room temperature (20–25 °C). The low boiling point of DME (i.e., − 25 °C) allows it to be easily removed via evaporation for recycling/reuse [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Effective lipid extraction from undewatered microalgae liquid using subcritical dimethyl ether

Wang

Oshita

Takaoka

2021

Biotechnol Biofuels

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Background Recent studies of lipid extraction from microalgae have focused primarily on dewatered or dried samples, and the processes are simple with high lipid yield. Yet, the dewatering with drying step is energy intensive, which makes the energy input during the lipid production more than energy output from obtained lipid. Thus, exploring an extraction technique for just a thickened sample without the dewatering, drying and auxiliary operation (such as cell disruption) is very significant. Whereas lipid extraction from the thickened microalgae is complicated by the high water content involved, and traditional solvent, hence, cannot work well. Dimethyl ether (DME), a green solvent, featuring a high affinity for both water and organic compounds with an ability to penetrate the cell walls has the potential to achieve this goal. Results This study investigated an energy-saving method for lipid extraction using DME as the solvent with an entrainer solution (ethanol and acetone) for flocculation-thickened microalgae. Extraction efficiency was evaluated in terms of extraction time, DME dosage, entrainer dosage, and ethanol:acetone ratio. Optimal extraction occurred after 30 min using 4.2 mL DME per 1 mL microalgae, with an entrainer dosage of 8% at 1:2 ethanol:acetone. Raw lipid yields and its lipid component (represented by fatty acid methyl ester) contents were compared against those of common extraction methods (Bligh and Dryer, and Soxhlet). Thermal gravimetry/differential thermal analysis, Fourier-transform infrared spectroscopy, and C/H/N elemental analyses were used to examine differences in lipids extracted using each of the evaluated methods. Considering influence of trace metals on biodiesel utilization, inductively coupled plasma mass spectrometry and inductively coupled plasma atomic emission spectroscopy analyses were used to quantify trace metals in the extracted raw lipids, which revealed relatively high concentrations of Mg, Na, K, and Fe. Conclusions Our DME-based method recovered 26.4% of total raw lipids and 54.4% of total fatty acid methyl esters at first extraction with remnants being recovered by a 2nd extraction. In additional, the DME-based approach was more economical than other methods, because it enabled simultaneous dewatering with lipid extraction and no cell disruption was required. The trace metals of raw lipids indicated a purification demand in subsequent refining process.

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Section: Introductionmentioning

confidence: 99%

Effective lipid extraction from undewatered microalgae liquid using subcritical dimethyl ether

Wang

Oshita

Takaoka

2021

Biotechnol Biofuels

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“…The Peng-Robinson EOS by use of the van der Waals mixing rules predicts the phase behavior accurately, except for the solubility of DME in the water-rich phase. The mixing rules useful for modeling polar components, such as Wong-Sandler (Valtz et al 2004), can be used in future studies to improve the phase-behavior model.…”

Section: Phase-behavior Modelmentioning

confidence: 99%

Treatment of Condensate and Water Blocks in Hydraulic-Fractured Shale-Gas/Condensate Reservoirs

et al. 2016

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The accumulation of condensate in fractures is one of the challenges of producing gas from gas/condensate reservoirs. When the bottomhole pressure drops to less than the dewpoint, condensate forms in and around fractures and causes a significant drop in the gas relative permeability, which leads to a decline in the gasproduction rate. This reduction of gas productivity is in addition to the reduction because of water blocking by the fracturing water. Solvents can be used to remove liquid blocks and increase gasand condensate-production rates. In this paper, dimethyl ether (DME) is introduced as a novel solvent for this purpose. In addition to good partitioning into condensate/gas/aqueous phases, DME has a high vapor pressure, which improves the flowback after the treatment. We compare its behavior with both methanol (MeOH) and ethanol (EtOH) solvents.

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“…The normal boiling point of DME is −24.8 °C; thus, it is gaseous under standard conditions with a saturated vapor pressure of 0.59 MPa at 25 °C [ 6 ]. Liquefied DME is partially miscible with water, where the saturated water concentration in liquefied DME is approximately 7.5 wt.% at 25 °C [ 7 , 8 , 9 ]. Based on these characteristics, several groups have carried out dewatering processes using DME, as well as extracted several organic components from lignite, soil, plants, and biomass using DME as the solvent medium [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Ethanol-free antisolvent crystallization of glycine by liquefied dimethyl ether

Kanda

Katsube

Hoshino

et al. 2020

Heliyon

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Liquefied dimethyl ether (DME) was employed as an antisolvent to crystallize glycine from its aqueous solution. The proposed method can be performed at 20–25 °C and has the potential to reduce the energy consumption of drying or crystallizing using ethanol. α-Glycine crystals were successfully obtained from glycine aqueous solutions by mixing in liquefied DME, which was easily removed from the crystals by decompression. Contact with a liquefied DME/water mixture and small γ-glycine crystals resulted in the α-glycine converting to γ-glycine. This was only observed for saturated glycine solutions. We speculated that this conversion occurs via a solution-mediated transition. Pure liquefied DME is not capable of promoting solvent-mediated transitions, so saturated glycine solutions treated with the pure antisolvent can give α-glycine as the sole product.

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The solubility of water in mixtures of dimethyl ether and carbon dioxide

Cited by 37 publications

References 30 publications

Effective lipid extraction from undewatered microalgae liquid using subcritical dimethyl ether

Effective lipid extraction from undewatered microalgae liquid using subcritical dimethyl ether

Treatment of Condensate and Water Blocks in Hydraulic-Fractured Shale-Gas/Condensate Reservoirs

Ethanol-free antisolvent crystallization of glycine by liquefied dimethyl ether

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