Vapor Pressures and Vapor−Liquid Equilibria of the 2,2,2-Trifluoroethanol + Quinoline System

Abstract

Both vapor pressures and vapor−liquid equilibria (VLE) of the 2,2,2-trifluoroethanol (TFE) + quinoline system, which can be considered as a potential candidate to overcome serious disadvantages of the existing working fluids used for absorption chillers, were measured in order to determine the allowable operation range of this organic mixture. Vapor pressures were measured by using the boiling point method in the temperature range of 293.15 K to 458.55 K and in the concentration range of (0.0 to 100.0) mass percent of TFE and were correlated with an Antoine-type equation. The resulting average absolute deviation (AAD) between the experimental and calculated values was found to be 2.22%. The isobaric VLE data of the 2,2,2-trifluoroethanol (TFE) + quinoline mixture were measured at three different pressures of (13.33, 53.33, and 101.33 kPa), and the thermodynamic consistency was checked by using the point test method.

Vapor Pressures of the 1-Butyl-3-methylimidazolium Bromide + Water, 1-Butyl-3-methylimidazolium Tetrafluoroborate + Water, and 1-(2-Hydroxyethyl)-3-methylimidazolium Tetrafluoroborate + Water Systems

“…A sample solution of a desired absorbent concentration was used in each run. The condenser was worked with a sufficiently cooled temperature (≈ −10°C) to minimize the amount of condensed vapor because this water vapor can vary the initial concentration. ,− …”

Refractive index and heat capacity of 1-butyl-3-methylimidazolium bromide and 1-butyl-3-methylimidazolium tetrafluoroborate, and vapor pressure of binary systems for 1-butyl-3-methylimidazolium bromide + trifluoroethanol and 1-butyl-3-methylimidazolium tetrafluoroborate + trifluoroethanol

“…The initial concentration that was calculated in preparing each sample solution was scarcely varied by the increase of less than 0.1 mass% absorbent. The apparatus, procedure, and verification were already carried out in our previous investigation [16,[23][24][25][26]]. …”

“…Various organic chemicals as alternatives to the conventional working fluids such as lithium bromide+water (LiBr + H 2 O) and ammonia + water (NH 3 + H 2 O) have been reported. These organic working fluids-mainly consisting of fluoroalcohol refrigerants and their partner organic absorbents-can surmount the difficulties of classical working fluids, but they have simultaneously given rise to new problems such as thermal instability, the volatility of the absorbent, and the low process efficiency [15][16][17][18][19][20].…”

Thermodynamic properties of a new working pair: 1-Ethyl-3-methylimidazolium ethylsulfate and water

“…The vapor pressures were measured by the boiling point method [10]. This method is valid because the vapor pressure of the ionic liquid is neglectable compared with the vapor pressure of water [11][12][13][14][15].…”

“…Until now, the working pairs in the absorption heat pump systems are mainly ammonia-water and lithium bromide-water [1]. However, ammonia-water fluids are known to have disadvantages of high working pressure and toxicity, whereas water-lithium bromide mixture has disadvantages of corrosion and crystallization [2]. Thus, it is absolutely necessary to explore new working pairs that can overcome the serious corrosion and crystallization problems.…”