Ionic liquids as entrainer in extractive distillation for effectively separating 1-propanol–water azeotropic mixture

You, Xinqiang; Zhao, Kai; Li, Ling; Qiu, Ting

doi:10.1016/j.cjche.2021.12.007

Cited by 8 publications

(1 citation statement)

References 46 publications

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“…As this process involved water, impurities of water were often present in the 1-propanol produced. − The task of obtaining high-purity 1-propanol was challenging due to the formation of azeotropes at specific concentration ratios, caused by the small 2.6 °C difference between the boiling points of 1-propanol and water . Hence, choosing the suitable separation technique becomes crucial for the 1-propanol + water azeotropic system. − Various techniques can be utilized to separate azeotropes, such as pressure swing distillation, adsorption separation, membrane separation, and extractive distillation. Pressure swing distillation requires complex equipment and consumes significant energy, adsorption separation necessitates regeneration steps, and membrane separation may be affected by membrane degradation. , In contrast, extractive distillation can be conducted at atmospheric pressure, reducing energy consumption and requiring less complex equipment while offering higher separation efficiency.…”

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confidence: 99%

Measurement and Correlation of Isobaric VLE Data for 1-Propanol + Water + 1-Butyl/Decyl-3-methylimidazole Bromide/Nitrate ILs at 101.33 kPa

Ren,

Wang,

Xiang

et al. 2024

J. Chem. Eng. Data

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Here, a novel protocol for the separation of the azeotropic system was performed by combining experimental investigations with the COSMO-RS prediction and molecular simulation to select ILs to break up the azeotropic point. The VLE data for the 1-propanol (1) + water (2) + ILs (3) azeotropic system were measured using a Fischer still at 101.33 kPa and correlated by the NRTL model. Four types of [Bmim]Br, [Bmim]NO 3 , [Demim]Br, and [Demim]NO 3 ILs synthesized were screened to separate the azeotropic system. The affinity interaction occurred between the ILs and water, leading to the formation of the salting-out effect on 1-propanol because the ILs binding water molecules made free water molecules decrease, leading to the precipitation of 1-propanol in the pseudobinary azeotropic system. By comparison, the cations and anions of ILs for the salting-out effect are in the order as follows: [Demim] + > [Bmim] + and NO 3 − > Br − . Additionally, the descending orders of the ILs for the salting-out effect are [Demim]NO 3 , [Demim]Br, [Bmim]NO 3 , and [Bmim]Br. 30% (molar fraction) of ILs can separate the azeotropic systems by breaking up the azeotropic point.

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