Accelerated decantation of biodiesel–glycerol mixtures: Optimization of a critical stage in biodiesel biorefinery

Noureddin, Afifa; Shirazi, Mohmmad Mahdi A.; Tofeily, Joumana; Kazemi, Pezhman; Motaee, Elahe; Kargari, Ali; Mostafaei, Mostafa; Akia, Mandana; Karout, Ali; Jaber, Rana; Hamieh, Tayssir; Tabatabaei, Meisam

doi:10.1016/j.seppur.2014.05.011

Cited by 20 publications

(6 citation statements)

References 17 publications

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“…They argued that the addition of 1 g conventional NaCl salt/100 ml glycerol-biodiesel mixture decreased the glycerol settling time significantly by 100% while maintaining the methyl ester purity as high as the control (0 g NaCl). In a different study, Noureddin et al (2014) investigated the interactive effects of prominent parameters, i.e., temperature (25-65 o C), NaCl addition (0-2 g/100ml), and methanol concentrations (10-30 vol.%) on decantation behavior of glycerol/biodiesel mixture. They reported that decantation time was significantly decreased by 200% (3 min) under the optimum conditions, i.e., 45 o C, 1 g NaCl addition and 20% excess methanol (Noureddin et al, 2014).…”

Section: Biodiesel-glycerin Separation (Decantation)mentioning

confidence: 99%

“…On the other hand, it should be noted that the presence of excess methanol and its progressive evaporation generally affects the decantation time negatively through the formation of miniemulsions (Noureddin et al, 2014). More specifically, methanol is adsorbed at the interface between the glycerin and biodiesel phases and consequently reduces the interfacial tension (IFT).…”

Section: Alcohol Recovery (Recycling)mentioning

confidence: 99%

“…However, if the excess methanol exceeds a certain level, the surplus obviously enters the glycerin phase more than the biodiesel phase due to the fact that there are extensive possibilities for hydrogen bonding between the glycerin molecules and methanol. The contained methanol in the glycerol phase would result in decreased viscosity of glycerin which consequently facilitate its speedy decantation (Noureddin et al, 2014). The exact amount of the excess alcohol to be used in the process in order to accelerate the glycerin-biodiesel decantation process needs to be determined according to a specific biodiesel production practice.…”

Section: Alcohol Recovery (Recycling)mentioning

confidence: 99%

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Recent trends in biodiesel production

et al. 2015

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HIGHLIGHTSThis article fully discusses the recent trends in the production of one the most attractive types of biofuels, i.e., biodiesel.with a focus on the existing obstacles for its large scale production. Moreover, recent innovations/improvements under three categories of upstream, mainstream, and downstream processes are also presented. Upstream strategies are mainly focused on seeking more sustainable oil feedstocks and/or enhancing the quality of waste-oriented ones. The mainstream strategies section highlights the numerous attempts made to enhance agitation efficiency including chemical and/or mechanical strategies. Finally, the innovative downstream strategies basically dealing with 1) separation of biodiesel and glycerin, 2) purification of biodiesel and glycerin, and 3) improving the characteristics of the produced fuel, are comprehensively reviewed.

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Section: Biodiesel-glycerin Separation (Decantation)mentioning

confidence: 99%

Section: Alcohol Recovery (Recycling)mentioning

confidence: 99%

Section: Alcohol Recovery (Recycling)mentioning

confidence: 99%

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Recent trends in biodiesel production

et al. 2015

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“…It was later extended to study the effect of excess alcohol and temperature along with NaCl addition. The optimum condition was reported to 40°C temperature, 1 gm NaCl per 100 ml of biodiesel, and 20% excess alcohol yielding 90% biodiesel with 200% acceleration in decantation rate . Though these conditions favour fast decantation, the purification steps are not eliminated.…”

Section: Recent Separation and Purification Techniquesmentioning

confidence: 99%

A review on separation and purification techniques for biodiesel production with special emphasis on Jatropha oil as a feedstock

Suthar

Dwivedi

Joshipura

2019

Asia-Pacific J Chem Eng

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Biodiesel is a promising alternative to conventional fuels. Research on biodiesel has vast experimental findings, but the outcomes are not always unidirectional.The sequence of unit operation for various transesterification processes is studied. The review work emphasizes on the separation and purification of Jatropha-derived biodiesel. The study on the downstream processes of alcohol recovery, glycerol-rich and biodiesel-rich phase separation, and biodiesel purification techniques is the main part of this paper. The biodiesel purification includes wet and dry washing and membrane techniques. The purpose of the review is to find separation techniques that are less energy-intensive and environmentally friendly purification processes for biodiesel production from Jatropha. The strategies to reduce the cost of biodiesel production from Jatropha are discussed. The Jatropha biodiesel possesses huge potential as one of the alternative energy sources for commercial exploitation in India.

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“…Therefore, alternative technologies with low energy consumption, low operating cost and high separation efficiency for liquid/liquid separation of glycerol and water from the biodiesel need to be explored. These are decantation [9] and sedimentation [10], filtration or membrane [11] and distillation [12].…”

Section: Introductionmentioning

confidence: 99%

Development of Purification Process Using Electrocoagulation Technique for Biodiesel Produced via Homogeneous Catalyzed Transesterification Process of Refined Palm Oil

et al. 2020

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This work is focused on the preliminary development of purification process using electrocoagulation technique for biodiesel produced via homogeneous catalyzed transesterification process of refined palm oil (RPO) to shorten the separation process and reduce the water consumption during the final purification with water-washing process. Biodiesel as Fatty acid methyl esters (FAMEs) were produced via transesterification reaction of RPO as feedstock with methanol in the presence of sodium hydroxide derivative-catalyst at the optimal condition using conventional heating. Electrocoagulation separation process was in-house designed to investigate the effects of electrode configurations such as shapes, distances between electrodes and suitable applied AC high voltages (ranging from 1 to 9 kV) on the separation efficiency of glycerol and biodiesel. Results revealed that with the electrocoagulation process at room temperature using AC electrical current at high voltage of 3 kV (and low amperage) with a point to point electrode configuration and the vertical-distance between electrodes of 3 cm was very efficient and achieved higher free glycerol removal than using the conventional separation of the gravitational settling. Furthermore, the separation time was significantly shortened from typically > 24 h with the gravitational settling to 240 s (4 min) and the number of water-washing was reduced from 5 to 3 times during the final purification process. The final purity of biodiesel was 98.89%±0.25% with high quality according to standards of EN 14214 and ASTM D6751.

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Accelerated decantation of biodiesel–glycerol mixtures: Optimization of a critical stage in biodiesel biorefinery

Cited by 20 publications

References 17 publications

Recent trends in biodiesel production

Recent trends in biodiesel production

A review on separation and purification techniques for biodiesel production with special emphasis on Jatropha oil as a feedstock

Development of Purification Process Using Electrocoagulation Technique for Biodiesel Produced via Homogeneous Catalyzed Transesterification Process of Refined Palm Oil

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