Table 3 - uploaded by Jadran Vrabec
Content may be subject to copyright.
Experimental vapor−liquid equilibrium data along the saturated liquid line of CO 2 + ketone mixtures generated in this work a CO 2 + acetone
Source publication
Vapor − liquid equilibrium (VLE) data of the binary mixtures carbon dioxide (CO2) + acetone and CO2 + pentanones (i.e. all C5-ketones, which are 3-methyl-2-butanone, 2-pentanone, and 3-pentanone) are measured at 313.15 K, 333.15 K, and 353.15 K up to a pressure of 11.8 MPa using a high pressure view cell technique based on the synthetic method. The...
Context in source publication
Context 1
... approach is denoted as PR+HV+UNIQUAC in the following. Table 3 and are compared with the available experimental data from the literature in Fig. 2 (Fig. 3). However, the present vapor pressure data of the binary mixture CO 2 + 2-pentanone are slightly higher than those of Aida et al. [46] (Fig. 4), ...
Citations
... Above the LLE curve, the system is a single fluid phase. Based on Fig. 6, a similar behavior to {CO 2 + DMSO} was verified for transition pressures of the ternary system (see Fig. 7). Figure 7 also shows a comparison between this work data for {CO 2 + acetone} system with those obtained by [30,31]. ...
Dimethyl sulfoxide (DMSO) and acetone are frequently used in supercritical antisolvent (SAS) processes, since they have very different physical properties and have complex phase behavior. This paper reports experimental phase equilibrium data for {CO2 + DMSO} and {CO2 + acetone + DMSO} systems. The static synthetic method was employed to obtain phase equilibrium behavior in pressures up to 12.1 MPa, temperature range between 313.15 and 343.15 K, the concentration of 5.5 mol·kg⁻¹ (solute: DMSO; solvent: acetone) on a CO2-free basis, and CO2 mole fractions between 0.652 and 0.953. The experimental data measured here presented transitions of VLE (vapor–liquid equilibrium) and LLE (liquid–liquid equilibrium) phases. In this work, the effects of association between molecules are considered. Thus, the PC-SAFT EoS was used to model the experimental data and phase transitions, and the pressure deviation between experimental and calculated data for the binary and ternary system was 0.81% and 0.51%, respectively. The percentage average absolute relative deviation (%AARD) for {CO2 + DMSO}, {CO2 + acetone} and {DMSO + acetone} system was 0.57, 0.89 and 0.29, respectively.
... With mixtures, the calculation becomes more involved. While multiple mixtures are supported by REFPROP, we chose to present the mixtures that have a firm backdrop in practice and the literature: ammonia/water (NH 3 /H 2 O) [23,24] mixtures and carbon dioxide/acetone (CO 2 /C 3 H 6 O) [25,26]. These mixtures show a significant increase in efficiency when regeneration is applied to the IE cycle. ...
... An overview of the working fluids including the characteristic properties, chosen temperature and pressure levels used in this study is provided in Table 1. [25,26] All these working fluids demonstrated a similar behavior shown in Figure 6 for ammonia, water, CO2 and acetone as typical examples. It can be seen that the highest relative efficiency is reached at the point of phase transition at high cycle pressure . ...
... An overview of the working fluids including the characteristic properties, chosen temperature and pressure levels used in this study is provided in Table 1. [25,26] All these working fluids demonstrated a similar behavior shown in Figure 6 for ammonia, water, CO 2 and acetone as typical examples. It can be seen that the highest relative efficiency is reached at the point of phase transition at high cycle pressure P H . ...
Economic expedience of waste heat recovery systems (WHRS), especially for low temperature difference applications, is often questionable due to high capital investments and long pay-back periods. With a simple design, isobaric expansion (IE) machines could provide a viable pathway to utilizing otherwise unprofitable waste heat streams for power generation and particularly for pumping liquids and compression of gases. Different engine configurations are presented and discussed. A new method of modeling and calculation of the IE process and efficiency is used on IE cycles with various pure and mixed working fluids. Some interesting cases are presented. It is shown in this paper that the simplest non-regenerative IE engines are efficient at low temperature differences between a heat source and heat sink. The efficiency of the non-regenerative IE process with pure working fluid can be very high, approaching Carnot efficiency at low pressure and heat source/heat sink temperature differences. Regeneration can increase efficiency of the IE cycle to some extent. Application of mixed working fluids in combination with regeneration can significantly increase the range of high efficiencies to much larger temperature and pressure differences.
... Acetone and ethanol as organic solvent have a higher solubility in CO2 at high-pressure than lowpressure system. Their binary mixture achieves the critical state of CO2 at an enough high-pressure system (Day et al., 2002;Hsieh and Vrabec, 2015). Hence, based on the P-T diagram reported by Ziegler et al. (1995), it can conclude that the operating condition in this study were conducted in the mixture critical point (MCP). ...
Curcuma xanthorrhiza Roxb , known as Temulawak or Javanese ginger, is a plant species. Its rhizomes are used as a medicinal herb. It contains curcumin as an active compound and ethereal oils mainly consisted of sesquiterpenes. In this work, Curcuma xanthorrhiza Roxb ethanolic extract was micronized with an addition of PVP using supercritical antisolvent (SAS) method. The ethanolic extract was obtained from dried Curcuma xanthorrhiza Roxb using soxhletation. For the micronization, the extracted compound solvent was a mixture of acetone and ethanol (90:10 (v/v)), while the supercritical CO2 was used as an antisolvent. The effect of operating conditions on the particle size and morphology was evaluated. Through this method, spherical Curcuma xanthorrhiza /PVP particles with mean diameter ranging from 191 ± 70 nm to 178 ± 57 nm were successfully formed. The particle size not significantly decreased as the pressure increased from 8 12 MPa. The addition of PVP is very effective to reduce the particle size, increase the solubility, and enhance the bioavailability of Curcuma xanthorrhiza extract. This work has the potential to improve the use of Curcuma xanthorrhiza in pharmaceutical and nutraceutical applications.
... Chen et al. [16] measured vapour-liquid equilibrium and densities. Bamberger and Maurer [17], Stievano and Elvassore [18], and Hsieh and Vrabec [19] measured vapour-liquid equilibrium. Wu et al. [20] and Chiu et al. [21] measured phase boundaries. ...
Compression/resorption refrigeration systems are similar to conventional vapor compression systems but using zeotropic mixtures with large boiling temperature difference, similar to the refrigerant/absorbent mixtures used in absorption technology. A resorber and a desorber replace the conventional condenser and evaporator, respectively. As the saturation temperature in both desorber and resorber change with the composition, there is a gliding temperature that can reduce the irreversibility of the heat transfer with external sensible heat and sink sources. Another advantage of these systems is that they operate at lower pressures and pressure ratios than the conventional ones. CO2/acetone mixture was proposed for automotive air-conditioning with compression/resorption systems. In this paper, different methods are evaluated for modelling the thermodynamic properties, using experimental data. The selected thermodynamic model will be used to study the performance of the compression/resorption refrigeration cycle.
... How can the solvent mixture and the solute affect the thermodynamic behavior of the selected system? Experimental measurements of VLEs of organic solvent-CO 2 systems of interest for the SAS process have been performed; for example, acetone-CO 2 [22][23][24][25][26][27] and ethanol-CO 2 [28][29][30][31] have been the mostly studied systems in the range of temperatures from 290 to 353 K and for pressure values up to 14 MPa. However, the VLEs of ternary systems formed by the mixture of these solvents have not been studied. ...
In the supercritical antisolvent (SAS) precipitation, the thermodynamic behavior of the system influences particles morphology. However, in the case of complex multicomponent systems, thermodynamic data are limited and there is the common tendency to neglect the solutes and consider the system as pseudo-binary (solvent−CO2). Polyvinylpyrrolidone (PVP) was precipitated using SAS from acetone-ethanol mixtures and different SAS morphologies were obtained at different operating conditions. To explain the obtained morphologies, VLEs of the ternary system acetone-ethanol−CO2 and of the quaternary system PVP-acetone-ethanol−CO2 were experimentally determined using a static synthetic method. It was evident that the presence of PVP, at different concentrations in the liquid solution, had an appreciable effect on the equilibria. Once the VLEs were determined, the morphologies of the powders precipitated by SAS were justified considering the position of the corresponding operating points with respect to the PVP-acetone-ethanol−CO2 mixture critical point.
... The bubble point pressures measured for the system were compared with data obtained by other authors: e.g. Hsieh and Vrabec [40], Stievano and Elvassore [41] and Day et al. [42]. The first two authors used a synthetic method, while the third one used an analytical method. ...
... Phase equilibrium diagram for the (CO 2 + acetone) system at 313.15 K This work; Hsieh and Vrabec[40]; Stievano and Elvassore[41]; Day et al.[42]. ...
High pressure phase equilibrium for four binary systems, (CO2 + 2-pentanol, CO2 + vinyl butyrate, CO2 + 2-pentyl butyrate and CO2 + butyric acid), were measured at three temperatures of (313.15, 323.15 and 333.15) K and pressures up to 11 MPa. These four organic compounds are those involved in the kinetic resolution of rac-2-pentanol and their phase equilibria play a significant role in the separation processes of the reaction compounds. Phase behaviour measurements were taken using a synthetic method in a variable volume high-pressure cell. It was checked that the solubility of CO2 in the four systems decreases with increases in temperature at a constant pressure and all systems present type-I phase behaviour within scope of this work. Modifications of Henry's Law and Peng-Robinson and Soave-Redlich-Kwong equations of state combined with the Quadratic mixing rule were used to correlate experimental equilibrium data to determine the phase behaviour of these systems.
... At the same time, predictive group-contribution methods for estimating these values for additional improvement of the precision of both models should be considered in future. The Journal of Supercritical Fluids xxx (2016) xxx-xxx Pointsexperimental data [112][113][114][115][116][117][118]. ...
... are calculated using van der Waals one fluid mixing rules , [42], [43], [44], [45], [46], ♦ [47], [48]). ...
... The reported value of the average absolute deviation of the mole fractions with this k ij value at 60 • C was 0.96% (40 • C: 2.03, 80 • C: 0.83). Since we could not find any reported data of the phase equilibria at 65 • C, which was the optimum temperature in the experimental conditions, the pressure-composition diagram in Fig. 4 was calculated and compared to other temperatures with reported experimental values [47][48][49][50][51][52][53][54][55]. This diagram was used to find the location of the experimental conditions on the phase diagram and see if the system is in a 1-phase region or a 2-phase region. ...
To evaluate the optimum operating conditions for the micronization of cyclotrimethylenetrinitramine (RDX) crystals using the Supercritical Anti-Solvent (SAS) process, a predictive approach incorporating the Hansen solubility parameters and jet behavior analysis has been suggested. The crystals were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction, and particle size analysis. Near the mixture critical point, the jet behavior and corresponding FE-SEM images of the particles indicated that agglomerations were present at pressures below that of the mixture critical point. On the other hand, for conditions above the mixture critical point, the relative energy difference values were calculated using the Hansen solubility parameters to compare the effectiveness of the carbon dioxide and acetone mixture as an antisolvent. Our analysis was supported by the micronized RDX particles with a lesser degree of agglomeration at the temperature of 65 °C, the pressure of 11 MPa, and the concentration of 4.24wt%. These results were attributed to higher pressures than the mixture critical point and a relatively high value of RED (3.74).
