One-parameter modified nonrandom two-liquid (NRTL) activity coefficient model

Gebreyohannes, Solomon; Neely, Brian J.; Gasem, Khaled A. M.

doi:10.1016/j.fluid.2014.07.027

Cited by 31 publications

(28 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the nature of the biomass feedstock, the electrolyte non‐random two‐liquid thermodynamic model was selected for Aspen simulation because it is appropriate for partially immiscible systems and non‐ideal mixtures 32,33 . The properties of biorefinery compounds not available in Aspen Plus databases were either calculated or estimated and the known properties were exported into the properties module 9,32 …”

Section: Methodsmentioning

confidence: 99%

Techno‐economics of one‐stage and two‐stage furfural production integrated with ethanol co‐production from sugarcane lignocelluloses

Ntimbani

Farzad

Görgens

2021

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

Lignocellulosic biomass processing to produce platform chemicals and biofuels is a promising alternative utilization of non-renewable resources. This study investigated the techno-economics of two-stage and one-stage furfural production integrated with ethanol co-production from sugarcane bagasse and harvest residues. The effect of process conditions on profitability was reflected by the minimum ethanol selling price (MESP) at a fixed furfural-selling price. Aspen Plus V8.8 was used to simulate the integrated two-stage furfural and ethanol co-production biorefineries using low (scenario 1), medium (scenario 2) and high (scenario 3) severity steam-explosion pretreatment. The two-stage furfural biorefineries integrated with ethanol co-production were compared with the most profitable one-stage furfural biorefinery integrated with ethanol co-production. The required MESP in scenario 2 (0.73 US$ L -1 ) was decreased by 36% compared with the one-stage furfural-ethanol biorefinery (1.14 US$ L -1 ). Scenarios 1 and 3 were disadvantaged by lower ethanol yields (150 versus 214 kg t -1 of feed) and higher capital investments (322-340) compared with scenario 2 (310 million US$). The onestage furfural production had higher heating demands (2034 versus 741-1124 kW t -1 feed) and reduced ethanol yields (90 versus 150-214 kg t -1 of feed) compared with integrated two-stage furfural and ethanol coproduction biorefineries. Optimization of process conditions, improving energy efficiency, and maximizing productivity within these energy self-sufficient facilities were critical to minimizing the MESPs, regardless of associated increases in capital and operational costs.

show abstract

Section: Methodsmentioning

confidence: 99%

Techno‐economics of one‐stage and two‐stage furfural production integrated with ethanol co‐production from sugarcane lignocelluloses

Ntimbani

Farzad

Görgens

2021

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

show abstract

“…calculations and it employs a three (3) adjustable parameters (two interaction parameters and the non-randomness factor) approach. These parameters are determined through regression of experimental data for a specific binary vapour-liquid equilibrium (VLE) system [28]. The concept of NRTL is based on the hypothesis proposed by Wilson that the local concentration around a molecule is different from that of the bulk concentration.…”

Section: Simulation Methodologymentioning

confidence: 99%

Modelling and optimisation of biodiesel production from Euphorbia lathyris using ASPEN Hysys

et al. 2019

View full text Add to dashboard Cite

Caper Spurge (Euphorbia lathyris) is a weed that is non-edible and have no other competitive use. The oil has a high percentage of mono-unsaturation in fatty acid composition hence an excellent non-edible feedstock for biodiesel production. The aim of this work is to model the production of biodiesel from E. lathyris using methanol and NaOH catalyst on an in silico platform. Based on the results obtained from the model, the effect of the process factors such as temperature, methanol-oil ratio and catalyst loading on the reaction conversion was evaluated. A quadratic model was developed using response surface methodology for estimating the response based on the levels of the process factors. Analysis of variance revealed that the model was significant. The optimal conversion was predicted as 83.5% and can be achieved at a temperature of 65 °C, 9.99 mol/mol methanol-oil ratio and 4.29 wt% catalyst loading. The study has successfully established a simulation framework to study the production of biodiesel from Caper spurge oil (E. lathyris L.).

show abstract

“…As mentioned earlier, Aspen Plus software was used to develop the simulations. The Non-Random Two-Liquid (NRTL) thermodynamic model was chosen to describe the liquid phase (Gebreyohannes et al, 2014). The model provides a good representation of phase equilibria for highly nonideal systems (Prausnitz et al, 1999).…”

Section: Simulation Proceduresmentioning

confidence: 99%

Comparison of acetone–butanol–ethanol fermentation and ethanol catalytic upgrading as pathways for butanol production: A techno-economic and environmental assessment

et al. 2021

View full text Add to dashboard Cite

Butanol is an important compound used as a building block for producing value-added products and an energy carrier. The main butanol production pathways are conventional acetone–butanol–ethanol (ABE) fermentation and catalytic upgrading of ethanol. On the other hand, the application of biomass as a promising substrate for biofuel production has been widely considered recently. However, few studies have compared different butanol production pathways using biomass as raw material. In light of that, the present work aims (i) to provide a short review of the catalytic ethanol upgrading and (ii) to compare conventional ABE fermentation and catalytic ethanol upgrading processes from the economic and environmental perspectives. Aspen Plus v9.0 was used to simulate both processes. The economic and environmental assessments were carried out considering the Colombian economic context, a gate-to-gate approach, and single impact categories. Considering a processing scale of 1000 ton/d, the conventional ABE fermentation process presented a more favorable technical, economic, and environmental performance for butanol production from biomass. It also offered lower net energy consumption (i.e., 57.9 GJ/ton of butanol) and higher butanol production (i.e., 2.59 ton/h). Nevertheless, the proposed processing scale was insufficient to reach economic feasibility for both processes. To overcome this challenge, the minimum processing scale had to be higher than 1584 ton/d and 1920 ton/d for conventional ABE fermentation and catalytic ethanol upgrading, respectively. Another critical factor in enhancing the economic feasibility of both butanol production pathways was the minimum selling price of butanol. More specifically, prices higher than 1.56 USD/kg and 1.80 USD/kg would be required for conventional ABE fermentation and catalytic ethanol upgrading, respectively. From the environmental impact point of view, the conventional ABE fermentation process led to a lower potential environmental impact than catalytic ethanol upgrading (0.12 PEI/kg vs. 0.18 PEI/kg, respectively).

show abstract

One-parameter modified nonrandom two-liquid (NRTL) activity coefficient model

Cited by 31 publications

References 21 publications

Techno‐economics of one‐stage and two‐stage furfural production integrated with ethanol co‐production from sugarcane lignocelluloses

Techno‐economics of one‐stage and two‐stage furfural production integrated with ethanol co‐production from sugarcane lignocelluloses

Modelling and optimisation of biodiesel production from Euphorbia lathyris using ASPEN Hysys

Comparison of acetone–butanol–ethanol fermentation and ethanol catalytic upgrading as pathways for butanol production: A techno-economic and environmental assessment

Contact Info

Product

Resources

About