HETEROGENEOUS AZEOTROPIC DEHYDRATION OF ETHANOL TO OBTAIN A CYCLOHEXANE-ETHANOL MIXTURE
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1 HETEROGENEOUS AZEOTROPIC DEHYDRATION OF ETHANOL TO OBTAIN A CYCLOHEXANE-ETHANOL MIXTURE Chemical Engineering Department University of Alicante (Spain) vgomis@ua.es Vicente Gomis Mª Dolores Saquete Alicia Font Ricardo Pedraza Victoria Pastor-Matea
2 OBJECTIVE Study the viability of cyclohexane in the ethanol dehydration to obtain an ethanol + cyclohexane mixture from an azeotropic distillation column.
3 INTRODUCTION Key renewable energy policy documents of the EU 1997 White Paper "Energy for the future" Doubling the share of renewable energy from 6% (1997) to 12% (2010) 2003 EU Biofuels Directive (2003/30/EC) Target for biofuels in transport: 2% by 2005, 5.% by Directive on the promotion of the use of energy from renewable sources (2009/28/EC) Overall EU target : 20% renewable energy in gross final energy consumption in 2020 Target of 10% renewable energy in transport in 2020 for all member states
4 INTRODUCTION Ethanol Production Sectored emissions in Europe Energy 48% A griculture 8% Waste 2% Industry 8% Transpo rt 34% Benefits of biofuels Reduce GHG emissions Improve air quality Reduce petroleum dependence Improve energy security
5 INTRODUCTION Ethanol Production
6 INTRODUCTION Ethanol dehydration Pressure Swing Adsorption Azeotropic distillation
7 INTRODUCTION Azeotropic distillation TERNARY AZEOTROPE (E) Ethanol FEED Ethanol/Water + Benzene (B) (G) (D) (N) ABSOLUTE ALCOHOL (M) (C) Water M E D C G A Heterogeneous region 25 N 0 B Benzene
8 INTRODUCTION Possible entrainers Benzene (Young, 1902) Pentane Acetone Hexane Heptane Toluene Isooctane Cyclohexane Gasoline components
9 INTRODUCTION Conventional Process Raw materials Proposed Process Ethanol Production Mixing with gasoline Fuel Raw materials Ethanol + Gasoline Production Fuel
10 INTRODUCTION Cost diminution of: - Mixing Advantages - Transportation - Storage
11 EXPERIMENTAL DESIGN Study in an experimental semi-pilot plant column Simulation of the industrial process
12 Semi-Pilot Plant Column study Cyclohexane
13 Semi-Pilot Plant Column study Operation Variables Feed 1: pure cyclohexane. Temperature = 66 ± 1ºC Simulation Variables Flow rate = g/min Feed 2: water + ethanol mixture (94% wt. of ethanol). Temperature: 63 ±1ºC Flow rate = 4.38 g/min Condenser: Temperature = 35ºC Heat exchanger 3: Temperature of the stream leaving HE-3 = 66 ±1ºC Simulated in Chemcad 6 Rigorous calculation using the SCDS module (simultaneous correction method for rigorous fractionation simulation) Thermodynamic model: UNIFAC
14 Semi-Pilot Plant Column study 1.0 Bottoms Product Weight Fraction Optimal Ethanol Simulation Cyclohexane Simulation Cyclohexane Ethanol The trends observed in the experimental results resemble their simulated counterparts Reboiler Heat Duty (W) The ethanol concentration depends on the heat duty Only values ranging from 80- W permit ethanol concentrations close to 5 % wt.
15 Semi-Pilot Plant Column study Weight Fraction Too high Bottoms Product Reboiler Heat Duty (W) Water Simulation Water < ppm The trends observed in the experimental results resemble their simulated counterparts The concentration of water in the residue stream does vary considerably with respect to the reboiler heat duty As the heat duty increases, the concentration of the water gradually decreases, reaching values lower than ppm.
16 Semi-Pilot Plant Column study Weight Fraction Aqueous phase Reboiler Heat Duty (W) The composition of the aqueous layer is also dependent on the heat duty The composition tends to approach that of the plait point of the system. Water Simulation Ethanol Simulation Water Simulation Water Ethanol Cyclohexane The simulation adequately reproduces neither the flow rate values of the bottom product and aqueous layer obtained experimentally nor the composition of the streams
17 Semi-Pilot Plant Column study Flows Flow (g/min) Simulation Aqueous decant Bottoms Product Reboiler Heat Duty (W) The simulation adequately reproduces neither the flow rate values of the bottom product and aqueous layer obtained experimentally nor the composition of the streams The flow rate of the residue is always higher than that of the aqueous layer Both flow rates become more similar when the reboiler heat duty increases.
18 Semi-Pilot Plant Column study Water 0 25 Ethanol UNIFAC non isothermal binodal curve Experimental non isothermal binodal curve UNIFAC phase split prediction 0 Plait Point Cyclohexane
19 Semi-Pilot Plant Column study Etanol Agua Experimental UNIFAC UNIFAC Dortmund UNIFAC LLE 0 Ciclohexano
20 Semi-Pilot Plant Column study Etanol Agua Experimental UNIQUAC NRTL α constante NRTL α variable 0 Ciclohexano
21 CONCLUSIONS It is possible, through azeotropic distillation, to obtain a mixture of cyclohexane + ethanol with concentrations of water lower than ppm without the need to distill absolute ethanol beforehand. Afterward, the mixture could be directly employed as a carburant in car engines with no further modifications. The most critical parameter of the process is the reboiler heat duty. At lower values, this produces a mixture of cyclohexane + ethanol with excessive amounts of water. Whereas, at higher values the azeotropic distillation column does not work properly, since the top stream condenses giving only one liquid phase. Significant differences in some values are encountered between experimental and simulated data which can be attributed to the calculation of the liquid-liquid equilibrium. It is therefore necessary to improve the correlation of the experimental equilibrium data for determined regions of the ternary system diagram.
22 CONCLUSIONS The production of dry mixture of ethanol + cyclohexane seems to be technically and economically viable
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