Use of glycerol as entrainer in the dehydration of bioethanol using extractive batch distillation: Simulation and experimental studies

Navarrete-Contreras, Salomón; Sánchez-Ibarra, Mauricio; Barroso-Muñoz, Fabricio Omar; Hernández, Salvador; Castro‐Montoya, Agustín Jaime

doi:10.1016/j.cep.2014.01.003

Cited by 33 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The feasibility of using glycerol for extractive distillation has been verified by vapor−liquid equilibrium (VLE) measurements by Lee et al, 2 Souza et al, 3 and Pla-Franco et al 4 Results showed that the azeotrope of water + ethanol will be effectively removed by the addition of glycerol. Energy evaluation and process optimization have also been reported by García-Herreros et al, 5 Navarrete-Contreras et al, 6 and Gil et al 7,8 NRTL parameters in the database of Aspen Plus process simulator were frequently used for the calculation of activity coefficients in the liquid phase.…”

Section: ■ Introductionmentioning

confidence: 88%

Vapor–Liquid Equilibrium of Water + Ethanol + Glycerol: Experimental Measurement and Modeling for Ethanol Dehydration by Extractive Distillation

2015

View full text Add to dashboard Cite

The present work aims at establishing reliable activity coefficient model for vapor−liquid equilibrium (VLE) of the system water + ethanol + glycerol, with an emphasis on the application in ethanol dehydration by extractive distillation. New experimental data were reported for ternary VLE at 100 kPa, boiling temperature of water + glycerol at 101.33 kPa, and infinite dilution activity coefficient of water and ethanol, respectively, in glycerol at five temperatures of 313.15 K to 393.15 K. The NRTL equation was used for the modeling. For extending the composition and temperature range of data source, literature data of binary VLE of water + ethanol, infinite dilution activity coefficients of water + ethanol, and excess enthalpies of water + glycerol were also used for optimization of the NRTL parameters. The correlation showed that the azeotrope of water + ethanol can be removed at a glycerol mass fraction of 0.0902. The experimental results were compared graphically with those of calculations, showing good agreement. Comparisons were also presented for experimental results and correlations available in the literature. ■ INTRODUCTIONUsing glycerol as entrainer for ethanol dehydration is an interesting topic because it aims at reducing the energy demand for bioethanol production by use of a coproduct of biodiesel. Herein, bioethanol and biodiesel are both biofuels that have received worldwide interest in recent years. Glycerol has many attractive features. It is nontoxic and environment compatible. Due to the large-scale production of biodiesel, glycerol is highly available and inexpensive. Under temperatures below 100°C, the vapor pressure of glycerol is very low. It is regarded as a typical example of biobased solvent and has received increasing attention for its use in the chemical industry. 1 The mixture of water + ethanol forms a minimum boiling point azeotrope at about 0.96 mass fraction of ethanol. Simple distillation cannot be used to distill ethanol above the azeotropic composition. The feasibility of using glycerol for extractive distillation has been verified by vapor−liquid equilibrium (VLE) measurements by Lee et al., 2 Souza et al., Results showed that the azeotrope of water + ethanol will be effectively removed by the addition of glycerol. Energy evaluation and process optimization have also been reported by García-Herreros et al., 5 Navarrete-Contreras et al., 6 and Gil et al. 7,8 NRTL parameters in the database of Aspen Plus process simulator were frequently used for the calculation of activity coefficients in the liquid phase.We have calculated VLE for the ternary system water (1) + ethanol (2) + glycerol (3) using NRTL parameters suggested by Souza et al.,4 and Aspen Plus (APV80 VLE-IG), respectively. Results showed significant deviations for different sources. Moreover, the infinite dilution activity coefficient of water in glycerol, γ 13 ∞ , deviated greatly and showed different trends of temperature dependence. Using the parameters of APV80 VLE-IG, the calculated value of γ 13 ∞ was less tha...

show abstract

Section: ■ Introductionmentioning

confidence: 88%

Vapor–Liquid Equilibrium of Water + Ethanol + Glycerol: Experimental Measurement and Modeling for Ethanol Dehydration by Extractive Distillation

2015

View full text Add to dashboard Cite

show abstract

“…Considering glycerol as dehydrating agent, Souza et al [16] used an extractive distillation process conducted in stages with reflux (using two condensers, the vapor phase was recirculated from the primary to the secondary condenser); three different mass ratios (glycerol/ethanol) were studied (0.5, 0.7, and 0.9); the best result was obtained at the ratio of 0.9 (99.86°GL). Navarrete-Contreras et al [19] studied the effect of time and the reflux ratio on the purity of bioethanol, using different glycerol/ethanol mass ratios (w/w, 0.50, 1.0, and 2.0); the best result, around 98.5°GL, was obtained also at the highest ratio. This author also studied the use of EG as dehydrating agent, following the same conditions used for glycerol, getting the best result (about 98.4°GL) also at the highest ratio (2.0 w/w).…”

Section: Purification With Glycerolmentioning

confidence: 99%

“…Ethylene glycol (EG) has also been studied for this purpose, mainly due to the ease of reuse, low cost, and efficiency (reaching purities of up to 99.4°GL). However, although studies of biodegradation, handling and disposal of EG showed a very low risk of contamination to the environment [19,20], EG is known to be toxic to human health [7].…”

Section: Introductionmentioning

confidence: 99%

Sweet Potato Bioethanol Upgrade Using Organic and Inorganic Dehydrating Agents

et al. 2019

View full text Add to dashboard Cite

Glycerol, ethylene glycol, and quicklime were used as alternative dehydrating agents to obtain anhydrous bioethanol from sweet potato. The assay conditions were standardized using high bioethanol grades. For organic reagents, three volumetric ratios were studied whereas for quicklime, five concentrations were evaluated. Quicklime led to the highest bioethanol purity of 99.4°GL, followed by glycerol and ethylene glycol, reaching 96.9 and 96.6°GL, respectively. Glycerol and ethylene glycol were reused for 4 cycles with negligible loss of efficiency; however, the yield decreased by up to 8 %.

show abstract

“…This process stands out for its low energy consumption. Currently, the solvents used on extractive distillation to obtain anhydrous alcohol are glycerol, glycol, ionic liquid, salts, among others (Navarrete-Contreras et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Production of Anhydrous Bioethanol using Glycerol and 1-Butyl-3-Methylimidazolyl-Tetrafluoroborate in the Aspen Plus Simulator

Silva¹,

Félix²,

Vieira³

et al. 2021

American Journal of Engineering and Applied Sciences

View full text Add to dashboard Cite

Biofuels are present in the global scenario as an energy source derived from organic biomass, representing an economic and environmental alternative. They are a renewable source of energy with low rates of pollutants emissions and, consequently, less carbon dioxide is released into the atmosphere. The obtaining of bioethanol is originated from a fermentation process, in which a multi-component mix is generated and the anhydrous bioethanol is separated. To obtain such compounds, some operations are required, such as extractive distillation, where solvents are added in order to "break" the ethanol-water azeotrope. In the present work two solvents were used: Glycerol and the ionic liquid [BMIM][BF4]. Starting from a multi-component mixture composed by ethanol, water, acetic acid and isoamyl alcohol, the bioethanol purification process was simulated using the computational tool Aspen Plus® simulator. Through a comparative analysis, it was possible to determine which solvent presented the best performance, where operational parameters such as the reflux ratio, distillate rate and the solvent flow were analyzed. The purity degree of 99.7% in mass and an approximate production of 2764 kg/h of anhydrous bioethanol were fixed and the results showed that glycerol was the solvent that presented greater economic and environmental viability for the process, considering the operational parameters mentioned above.

show abstract

Use of glycerol as entrainer in the dehydration of bioethanol using extractive batch distillation: Simulation and experimental studies

Cited by 33 publications

References 16 publications

Vapor–Liquid Equilibrium of Water + Ethanol + Glycerol: Experimental Measurement and Modeling for Ethanol Dehydration by Extractive Distillation

Vapor–Liquid Equilibrium of Water + Ethanol + Glycerol: Experimental Measurement and Modeling for Ethanol Dehydration by Extractive Distillation

Sweet Potato Bioethanol Upgrade Using Organic and Inorganic Dehydrating Agents

Simulation of Production of Anhydrous Bioethanol using Glycerol and 1-Butyl-3-Methylimidazolyl-Tetrafluoroborate in the Aspen Plus Simulator

Contact Info

Product

Resources

About