Evaluation of different methods for the separation of acetonitrile and water. Part 1: Extractive distillation and distillation under reduced pressure

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-11 DOI:10.1016/j.molliq.2025.127576

Aleksandra Sander , Marko Rogošić , Alegra Vezjak Fluksi , Leonarda Frljak , Ana Petračić , Jelena Parlov Vuković

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引用次数: 0

Abstract

Conventional distillation is not able to separate the components of azeotropic mixtures efficiently, as vapour and liquid phase are identical in composition, and other techniques such as pressure swing distillation or distillation with entrainer are often used. The aim of this study was to explore the novel possibilities for separating azeotrope-forming mixture of acetonitrile and water. In this respect, extractive distillation and reduced pressure distillation were investigated. Extractive distillation was carried out with hydrophilic deep eutectic solvents (DESs) and various solid compounds. Reduced pressure distillation was carried out with and without entrainer. According to experiments, K₂CO₃ – ethylene glycol (1:10) and choline chloride were found to be the best new entrainers for extractive distillation, and novel DESs based on glycolic acid performed best in entrained reduced pressure distillation. The entraining effect was predicted with the COSMO-RS model, by calculating the σ-profiles of individual components and mixtures as well as the activity coefficients of individual components. Better predictions were obtained for extractive distillation with liquid DES entrainers. Vacuum evaporation proved to be a successful method for the regeneration of hydrophilic DESs.

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乙腈和水的不同分离方法的评价。第1部分：萃取蒸馏和减压蒸馏

由于蒸汽和液相的成分相同，传统的蒸馏不能有效地分离共沸混合物的组分，因此通常采用变压蒸馏或夹带蒸馏等其他技术。本研究的目的是探索分离乙腈和水的共沸混合物的新可能性。在这方面，研究了萃取精馏和减压精馏。采用亲水性深共晶溶剂（DESs）和多种固体化合物进行萃取精馏。用和不带夹带剂进行了减压蒸馏。实验结果表明，K2CO3 -乙二醇（1:10）和氯化胆碱是萃取精馏的最佳新型夹带剂，以乙醇酸为基料的新型DESs在夹带减压精馏中表现最佳。利用cosmos - rs模型，通过计算单个组分和混合物的σ-分布以及单个组分的活度系数，预测了夹带效应。液体DES夹带剂对萃取精馏的预测效果较好。真空蒸发是一种成功的再生亲水性DESs的方法。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.