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Title: Acetic acid separation from aqueous solutions using ionic liquids
Author: Liu, Jingyi
ISNI:       0000 0004 5371 4672
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2015
Availability of Full Text:
Full text unavailable from EThOS. Thesis embargoed until 01 Jul 2020
A series of hydrophobic ionic liquids (ILs) have been employed to extract acetic acid from aqueous solutions at 101.3 KPa. This study was carried out using tetradecyltrihexylphosphonium cation ([P666, 14]+) combined with two series of anions: benzoate and long-chain carboxylate based anions. For comparison, the extraction of organic solvent MTBE was also investigated. The long-chain carboxylate based ILs showed a larger two phase region and high extraction efficiency. [The performance of a selection of inorganic salts, organic salts, and ILs in the extractive distillation for the (HOAc + H20) system was analyzed by vapour-liquid equilibrium under atmospheric pressure. The results indicate that the inorganic salts showed a salting-out effect of acetic acid while all the organic salts and ILs presented salting-out effect of water. All the ILs investigated showed a notable salting-out effect of wate which implied that an IL might be a promising additive in extractive distillation processes. Supported materials were investigated in extractive distillation for the (HOAc + H20) system. The performance of a selection of organic and ILs functionalized supports was analyzed by vapour-liquid equilibrium at 101.3 kPa. Leaching problem of the imidazolium based IL tethered support, blockage problem of the powder support and the saturation of the support during continuous distillation are still the challenging parts in this work. The UNIFAC method was employed to correlate and predict the LLE and VLE data for IL/salt modified systems. The results illustrated that the UNIF AC model has the ability to correlate and predict both VLE and LLE in mixtures containing ILs or salts with satisfactory accuracy. In addition, the ability of a commercial process simulator (Aspen Plus), to model phase equilibrium for the ternary systems of (HOAc + H20 + IL/salt) was examined. The physico-chemical properties of the investigated ionic liquids were characterized as a function of temperature.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available