Removal of ethanol from aqueous streams by pervaporation

Brüschke, H. E. A.

doi:10.1016/0011-9164(90)85032-6

Cited by 17 publications

(7 citation statements)

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“…The optimal conditions within the experimental range were 65°C and 1400 Pa, in which the desirability function was 0.63, indicating that 63% of the required conditions were met. At this temperature, it has been reported that there is no change in colour, appearance or sugar content in the product and, accordingly, it can be assumed that no detrimental reactions occur. However, higher temperatures would achieve a better pervaporation result, but this is limited by membrane operation.…”

Section: Resultsmentioning

confidence: 94%

“…The influence of temperature on pervaporation is commonly studied, because it is expected that the diffusion rate of molecules will increase with temperature. As consequence, the permeate flux increases, usually following an Arrhenius-type relation (29), as shown in equation (12). Other parameters, such the total flux, permeate concentration and enrichment factor, also exhibit a similar relationship (27,32,37,47-49): (12) in which N 0 i is the pre-exponential factor, E a,i is the apparent activation energy, R is the gas constant and T is the feed absolute temperature.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…As consequence, the permeate flux increases, usually following an Arrhenius-type relation (29), as shown in equation (12). Other parameters, such the total flux, permeate concentration and enrichment factor, also exhibit a similar relationship (27,32,37,47-49): (12) in which N 0 i is the pre-exponential factor, E a,i is the apparent activation energy, R is the gas constant and T is the feed absolute temperature. From this equation, the apparent activation energy describes the effect of temperature on the driving force of the process (26).…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…Such beverages can be made using biological and physical methods. With the latter, several approaches have been reported including pervaporation , vacuum distillation , thin film evaporation , dialysis , reverse osmosis , spinning cone column distillation , osmotic distillation , membrane distillation and forward osmosis . All those methods have intrinsic disadvantages, the most common of which is the loss of aromatic volatile compounds, which usually exceed 75% of higher alcohols and 95% of esters , resulting in beer with reduced alcoholic, solvent and fruity aromas .…”

Section: Introductionmentioning

confidence: 99%

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Beer aroma recovery and dealcoholisation by a two-step pervaporation process

2019

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Pervaporation with a polydimethylsiloxane membrane (PDMS) has previously been used for the recovery of aroma compounds or to dealcoholise beer. This work considers two PDMS pervaporation processes and associated operating conditions. In addition to ethanol, two esters and one higher alcohol were chosen as key beer aroma compounds. The effects of feed flow rate and temperature on aroma recovery were studied, with feed temperature and permeate pressure evaluated with regard to beer dealcoholisation. The required membrane areas for a given alcoholic beer flow rate were simulated by mass balance to achieve a non‐alcoholic product. With aroma recovery, no concentration polarisation was observed with Reynolds numbers above 1520 and the optimal temperature was 10°C. For alcohol removal, the best operation conditions were 65°C and 1400 Pa. With such conditions, the required membrane surface to recover 50% of ethyl acetate from the original beer was 13.8 m2 in the first pervaporation unit, whereas 4.4 m2 was needed in the second one to achieve an alcohol content of 0.05% (v/v). The mixed final product was defined as an alcohol‐free beer with significant aroma compounds, showing the feasibility of pervaporation for both beer aroma recovery and dealcoholisation. © 2019 The Institute of Brewing & Distilling

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Section: Resultsmentioning

confidence: 94%

Section: Effect Of Temperaturementioning

confidence: 99%

Section: Effect Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beer aroma recovery and dealcoholisation by a two-step pervaporation process

2019

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“…Similarly, in the case of Water-Air permeation, the resistance in the membrane and liquid boundary layer becomes the rate-limiting ( Brüschke, 1990 ; Carvalho and Malcata, 2001 ; Raisi and Aroujalian, 2011 ). Thus, the overall resistance was assumed as the sum of the membrane and liquid boundary:…”

Section: Methodsmentioning

confidence: 99%

Effect of Membrane Hydrophobicity and Thickness on Energy-Efficient Dissolved Oxygen Removal From Algal Culture

Kishi

Nagatsuka

Toda

2020

Front. Bioeng. Biotechnol.

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Removal of dissolved oxygen from algal photobioreactors is essential for high productivity in mass cultivation. Gas-permeating photobioreactor that uses hydrophobic membranes to permeate dissolved oxygen (pervaporation) from its body itself is an energy-efficient option for oxygen removal. This study comparably evaluated the characteristics of various commercial membranes and determined the criteria for the selection of suitable ones for the gas-permeating photobioreactors. It was found that oxygen permeability is limited not by that in the membrane but in the liquid boundary layer. Membrane thickness had a negative effect on membrane oxygen permeability, but the effect was as minor as less than 3% compared with the liquid boundary layer. Due to this characteristic, the lamination of non-woven fabric with the microporous film did not significantly decrease the overall oxygen transfer coefficient. The permeability in the liquid boundary layer had a significantly positive relationship with the hydrophobicity. The highest overall oxygen transfer coefficients in the water-to-air and water-to-water oxygen removal tests were 2.1 ± 0.03 × 10 −5 and 1.39 ± 0.09 × 10 −5 m s −1 , respectively. These values were considered effective in the dissolved oxygen removal from high-density algal culture to prevent oxygen inhibition. Furthermore, hydrophobicity was found to have a significant relationship also with water entry pressure, which needs to be high to avoid culture liquid leakage. Therefore, these results suggested that a microporous membrane with strong hydrophobicity laminated with non-woven fabric would be suitable characteristics for gas-permeating photobioreactor.

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