Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

Lei, Zhigang; Xi, Xiaomin; Dai, Chengna; Zhu, Jing; Chen, Biaohua

doi:10.1002/aic.14478

Cited by 47 publications

(24 citation statements)

References 85 publications

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“…Penambahan zat elektrolit NaOH dan KOH akan mengurangi interaksi ikatan hidrogen antara molekul etanol dan air yaitu dengan melemahkan gaya tarik dipol-dipol antara molekul etanol-air (Lei et al, 2014). Semakin lemahnya gaya tarik dipol-dipol antara etanol-air maka energi yang dibutuhkan untuk memisahkan molekul etanol dan molekul air semakin kecil pula, sehingga etanol akan lebih mudah terpisah dari air.…”

Section: Gambar 3diagram T H -T K -X Sistem Etanol-air-zat Elektroliunclassified

REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE

Istiqomah¹,

Rahmawati²,

Nugrahaningtyas³

2016

ALCHEMY J.Pen.Kim

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<p class="Default">Soda ash (NaOH) has been used in bioethanol production in the second step destillation to increase the purity up to 90%. The destillation process will produce waste water with a high sodium content. The soda ash itself serve as an electrolyte to modify the colligative properties of the water-ethanol mixture allowing the disappearance of azeotropic point. This research aims to study the replacement of NaOH with KOH, in which the kalium is a nutrient to maintain soil fertility. This research study the thermodynamics properties, vapor-liquid equilibrium, colligative properties and also its azeotropic point in the destillation of water-ethanol mixture when KOH and NaOH were used as the additive. A model of water-ethanol mixture at a various composition of 0-100 weight % of ethanol was used. The electrolyte addition was 0.1 mol electrolyte/total weight of ethanol-water. The result shows that the addition of electrolyte into ethanol-water mixture eliminate the azeotropic point and allows the ethanol molecules to separate from water. The enthalpy of mixing between water-ethanol is 239.601 kJ/mol. It becomes 259.796 kJ/mol and 264.793 kJ/mol after the addition of NaOH and KOH, respectively. It confirming the endothermic mixing process due to different polarity between water and ethanol. The presence of electrolyte even reduce more their molecular interaction. However, the change to irregularity result a high positive entropy values that result the negative Gibbs free energy. It confirms the spontaneity of mixing. The vaporization enthalpy, H<sub>vap</sub>, of water-ethanol mixture is 76.229 kJ/mol and it becomes 235.366 kJ/mol and 126.189 kJ/mol after the addition of NaOH and KOH. It indicates that the presence of electrolyte inhibites vaporization of water as the major component and allowing ethanol molecules to vapor producing more high purity ethanol.</p>

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Section: Gambar 3diagram T H -T K -X Sistem Etanol-air-zat Elektroliunclassified

REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE

Istiqomah¹,

Rahmawati²,

Nugrahaningtyas³

2016

ALCHEMY J.Pen.Kim

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“…However, separation of this mixture is important because pure components can be reused in further applications. Extractive distillation is currently the most widely used process to separate the components in the azeotropic systems [2][3][4]. Nevertheless, this process shows some serious disadvantages such as need high energy to achieve a fluid phase system, and the use of volatile compounds.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid equilibria for ternary systems ethanol+heptane+phosphoric-based ionic liquids

Cai

Xiao

2015

Fluid Phase Equilibria

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“…The separation of ethanol/water as an azeotropic mixture can be performed by distillation techniques such as pressure-swing distillation, heterogeneous azeotropic distillation, extractive distillation, and salt-addition distillation [12]. Among these processes, extractive distillation is the most common industrial method [10,13] due to its low energy consumption, easy operation, and flexibility in selection of entrainers [12,14].…”

Section: Introductionmentioning

confidence: 99%

Vapor Liquid Equilibria for Ionic Liquid/Ethanol/Water Systems and the Effect of Anion Hydrolysis

et al. 2020

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The performance of two tetrafluoroborate-based ionic liquids (ILs) as entrainers in the dehydration of water/ethanol azeotropic mixtures was evaluated. Isobaric vapor-liquid equilibrium (VLE) data were measured for the systems ethanol/ water/1-butyl-3-methyl imidazolium tetrafluoroborate and ethanol/water /n-butylpyridinium tetrafluoroborate including the azeotropic region. VLE data for the ethanol/water, ethanol/IL, and water/IL binary mixtures were obtained at 100 kPa. The hydrolysis of the tetrafluoroborate anion was studied for both types of ILs by 19 F NMR analysis. The hydrolysis of the tetrafluoroborate anion does not have much effect on the ethanol/water VLE. The 19 F NMR analysis indicated that hydrolysis occurred at high mole fractions of water.

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Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

Cited by 47 publications

References 85 publications

REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE

REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE

Liquid–liquid equilibria for ternary systems ethanol+heptane+phosphoric-based ionic liquids

Vapor Liquid Equilibria for Ionic Liquid/Ethanol/Water Systems and the Effect of Anion Hydrolysis

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