Selective evaporation of a butanol/water droplet by microwave irradiation, a step toward economizing biobutanol production

Shibata, Yosuke; Tanaka, Kenya; Asakuma, Yusuke; Nguyen, Cuong V.; Hoang, Anh Son; Phan, Chi

doi:10.18331/brj2020.7.1.3

Cited by 15 publications

(7 citation statements)

References 28 publications

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“…12 The enhancement of alcohol at the water surface 13 also increased the formation of voids and nano-bubbles during MW. 14 Glucose solution. Figure 3 shows pro les of refractive index during the irradiation of different power.…”

Section: Resultsmentioning

confidence: 99%

Influence of microwave on aqueous solutions

Koreeda

Takai

Asakuma

et al. 2023

Preprint

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In addition to being an important household appliance, the microwave is an effective method for food processing and chemical synthesis. Recently, the effect of MW on water hydrogen bonds dynamic was quantified via the in-situ refractive index measurement. This study applied the technique to aqueous solutions with three solutes: ethanol, NaCl and glucose. It was found that ethanol enhanced the MW-induced effect on water structure. In contrast, NaCl reduced the magnitude of MW-induced impact. The influence of glucose varied critically with concentration. At a high concentration, glucose increased RI during the microwave. The findings can clarify and predict the efficiency of MW processes, which are widely used for chemical systhesis, nutrient extraction and food processing.

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Section: Resultsmentioning

confidence: 99%

Influence of microwave on aqueous solutions

Koreeda

Takai

Asakuma

et al. 2023

Preprint

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“…With high MW power, some of the decane droplets were visible at the top of the pendant drop. In previous studies, [ 33,34 ] it has been shown that the surface tension was quickly reduced with MW irradiation. The impact of de‐emulsification that is, bubble bursting at the surface, is expectedly weak during MW irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…The droplet shape was extracted and analyzed to produce surface tension. [ 33 ] The analysis was applied during and after the irradiation. Moreover, the surface tensions at different decane concentrations (5, 10, and 15 vol.…”

Section: Methodsmentioning

confidence: 99%

In‐situ monitoring of decane‐in‐water emulsion during microwave irradiation

et al. 2022

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Microwave (MW)-assisted de-emulsification has been attractive in processes of petroleum production and refining. However, the mechanism and optimal operation remain poorly understood. In this study, the behaviour of decane-inwater emulsion under MW irradiation was monitored in-situ through a size measurement system equipped with the reactor and surface tension profiles.The results indicated that the bubble was formed around the oil droplet during MW irradiation. The MW-induced bubbles can enhance de-emulsification in a similar mechanism as the flotation column. The efficiency of MW de-emulsification depends on emulsion content and MW power. Although a higher MW power is more effective, boiling caused by excessive energy must be considered due to the higher local heating. As a result, moderate power is more desirable. For the decane-in-water emulsions in this study, the optimal condition was determined to be around 500 W.

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“…37 Predicting the interfacial composition at elevated temperatures is essential to calculate the evaporation rate of the binary droplet. 41,42 3.2. Nonaqueous Solvents.…”

Section: Influence Of Temperaturementioning

confidence: 99%

Affinity of Amphiphilic Molecules to Air/Water Surface

Phan

2023

ACS Omega

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The affinity of amphiphiles to the water/air surface was modeled by adapting Eberhart’s equation. The proposed method successfully describes surface tension for all amphiphilic structures, including alkanols, carboxylic acids, nonionic, ionic, and Gemini surfactants. The model is more effective than conventional analysis for amphiphiles with multiple ionic states. The prediction was consistently validated at different temperatures and nonaqueous solvents. The modeling results show a linear correlation between surface affinity and hydrophobicity/hydrophilicity. For alkanols, the affinity increment is 2.84 kJ/mol per CH 2 group, the same as the reported hydrophobic energy from monomer to aggregate for nonionic surfactants. For carboxylic acids, the affinity increment per CH 2 group is 3.18 kJ/mol, incorporating the degree of acid dissociation. The affinity–hydrophilicity correlation is approximately −0.22 kJ/mol per oxyethylene group. The affinity constant can be obtained for all classes of amphiphiles to clarify the relationship between the molecular structure and surface activity.

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Selective evaporation of a butanol/water droplet by microwave irradiation, a step toward economizing biobutanol production

Cited by 15 publications

References 28 publications

Influence of microwave on aqueous solutions

Influence of microwave on aqueous solutions

In‐situ monitoring of decane‐in‐water emulsion during microwave irradiation

Affinity of Amphiphilic Molecules to Air/Water Surface

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