The problems in design and detailed analyses of energy consumption for biodiesel synthesis at supercritical conditions

Glišić, Sandra B.; Skala, Dejan

doi:10.1016/j.supflu.2008.12.011

Cited by 109 publications

(47 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The different configurations (flowsheets) are currently assessed by using commercial chemical process simulators and life cycle assessment (Glisic and Skala, 2009;Deshpande et al, 2010;Lee et al, 2011;Kiwjaroun et al, 2009). Lee et al (2011) evaluated three continuous biodiesel processes, including a conventional alkali-catalyzed process using both fresh and waste vegetable oil and a supercritical methanol process using waste vegetable oil as the raw material and reported that the alkali-catalyzed process using fresh vegetable oil had the lowest total capital investment, but the supercritical process was the most economically feasible overall, providing a lower manufacturing cost and higher net present value and a discounted cash flow rate of return.…”

Section: Innovative Technology In Biodiesel Production By Scmmentioning

confidence: 99%

See 1 more Smart Citation

Biodiesel production through non-catalytic supercritical transesterification: current state and perspectives

Silva

Oliveira

2014

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-The inconveniences of the conventional method for biodiesel production by alkaline catalysis suggests research towards alternative methods, with the non-catalytic transesterification using an alcohol at supercritical conditions proposed as a promising technique for biodiesel production. The so-called supercritical method (SCM) has powerful advantages over conventional techniques, such as fast reaction rates, feedstock flexibility, production efficiency and environmentally friendly benefits. However, application of this methodology has some limitations, like operating conditions (elevated temperature and pressure and higher amounts of alcohol), which result in high energy costs and degradation of the products generated. In this review paper the state of the art in relation to the use of the SCM for biodiesel production is reported and discussed, describing the characteristics of the method, the influence of operational parameters on the ester yield, patents available in the field and the perspectives for application of the technique.

show abstract

Section: Innovative Technology In Biodiesel Production By Scmmentioning

confidence: 99%

“…The economic analysis of the processes for biodiesel production using homogeneous alkaline catalysis and SCM has been reported (Glisic and Skala, 2009;Deshpande et al, 2010). It was noted that energy consumption is extremely similar in both cases.…”

Section: Introductionmentioning

confidence: 99%

Biodiesel production through non-catalytic supercritical transesterification: current state and perspectives

Silva

Oliveira

2014

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…8,117,[122][123][124][125][126][127][128][129][130] A number of authors have developed and evaluated the production process based on those technologies from a technical and economical point of view following a case study based simulation approach using ASPEN or HYSYS. 8,9,124,[130][131][132][133][134][135][136][137][138][139] The use of heterogeneous catalyzed processes (enzymatic, basic or acid based) or supercritical based processes are gaining support due to the reduced separation stages resulting in a very competitive prices. 9,136,138 which compete with the previously denoted as most economical, the acid catalyzed process, because it is less affected by the impurities of the raw material reducing the purification pretreatment stages.…”

Section: 32-production Process Of Biodiesel From Oilmentioning

confidence: 99%

On the Systematic Synthesis of Sustainable Biorefineries

Martı́n

Grossmann

2012

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Abstract.In this paper we review the current effort towards the design of production processes from different sources of biomass including first, second and third generation of biofuels such as bioethanol, biodiesel, hydrogen, FT-diesel. We review results of the design of these processes using advanced mathematical programming techniques to systematically evaluate a large number of alternative technologies, by optimally integrating the use of raw material, energy and water in order for the process not only to be economically feasible but also sustainable. Integration of processes is the future of biorefineries to exploit synergies to reduce the production cost.

show abstract

“…This recognised importance of biodiesel as a renewable fuel has resulted in extensive work in the area of biodiesel research. Some of these studies include the exploration of alternative biodiesel production pathways such as catalyst-free subcritical and supercritical biodiesel production processes [2,3] for enhanced biodiesel yields in short reaction times, the use of unconventional biodiesel feedstocks such as meat processing DAF sludge [1] and sewage sludge [4] as alternative lipid sources to improve economic performances and the modification of existing biodiesel production processes such as application of in-situ approaches to enhance biodiesel productivity [5]. Current investigations however highlight scientific interest in catalyst-free biodiesel production processes due to reduced reaction times (<10 min) and high percentage conversions (>95%) typically recorded in experimental work [2,6,7].…”

Section: Introductionmentioning

confidence: 99%

Catalyst-Free Biodiesel Production Methods: A Comparative Technical and Environmental Evaluation

2018

View full text Add to dashboard Cite

Abstract:In response to existing global focus on improved biodiesel production methods via highly efficient catalyst-free high temperature and high pressure technologies, this study considered the comparative study of catalyst-free technologies for biodiesel production as an important research area. In this study, therefore, catalyst-free integrated subcritical lipid hydrolysis and supercritical esterification and catalyst-free one step supercritical transesterification processes for biodiesel production have been evaluated via undertaking straight forward comparative energetic and environmental assessments. Energetic comparisons were undertaken after heat integration was performed since energy reduction has favourable effects on the environmental performance of chemical processes. The study confirmed that both processes are capable of producing biodiesel of high purity with catalyst-free integrated subcritical lipid hydrolysis and supercritical esterification characterised by a greater energy cost than catalyst-free one step supercritical transesterification processes for an equivalent biodiesel productivity potential. It was demonstrated that a one-step supercritical transesterification for biodiesel production presents an energetically more favourable catalyst-free biodiesel production pathway compared to the integrated subcritical lipid hydrolysis and supercritical esterification biodiesel production process. The one-step supercritical transesterification for biodiesel production was also shown to present an improved environmental performance compared to the integrated subcritical lipid hydrolysis and supercritical esterification biodiesel production process. This is because of the higher potential environment impact calculated for the integrated subcritical lipid hydrolysis and supercritical esterification compared to the potential environment impact calculated for the supercritical transesterification process, when all material and energy flows are considered. Finally the major contributors to the environmental outcomes of both processes were also clearly elucidated.

show abstract

The problems in design and detailed analyses of energy consumption for biodiesel synthesis at supercritical conditions

Cited by 109 publications

References 39 publications

Biodiesel production through non-catalytic supercritical transesterification: current state and perspectives

Biodiesel production through non-catalytic supercritical transesterification: current state and perspectives

On the Systematic Synthesis of Sustainable Biorefineries

Catalyst-Free Biodiesel Production Methods: A Comparative Technical and Environmental Evaluation

Contact Info

Product

Resources

About