Intensification of waste cooking oil transformation by transesterification and esterification reactions in oscillatory baffled and microstructured reactors for biodiesel production

Mazubert, Alex; Aubin, Joëlle; Elgue, Sébastien; Poux, Martine

doi:10.1515/gps-2014-0057

Cited by 25 publications

(14 citation statements)

References 14 publications

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“…In each experimental run, the WCO oil and the methoxide (solution of KOH and methanol) were poured inside the OBR with a methanol to oil molar ratio of 6:1 and a catalyst concentration of 1%, which have shown to provide the best reaction conversion in a number of studies [7,29,30,33]. The reactor temperature (40°C, 50°C and 60°C) was stabilized before the oscillation generation mechanism started.…”

Section: Methodsmentioning

confidence: 99%

“…At 50°C and after a residence time of 10 min, the authors obtained methyl ester yields in the range of 78-85% depending on the methanol-to-oil ratio. Mazubert et al [29] studied the process intensification of biodiesel production from waste cooking oil in a continuous glass OBR for relatively low temperatures and a few different oscillation conditions. At low temperature (27°C), the Re o in the range of 28-42 does not have a significant effect on reaction yield, which is between 82.3 wt% and 87.3 wt%.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of methyl ester production from waste cooking oil in a batch tri-orifice oscillatory baffled reactor

Soufi

Ghobadian

Najafi

et al. 2017

Fuel Processing Technology

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Transesterification of vegetable oils is a common route for the production of biodiesel. This reaction is a slow mass transfer limited reaction that has been shown to benefit from process intensification reactors such as the Oscillatory Baffled Reactor (OBR). The use of waste cooking oil as a resource is an attractive alternative to other virgin vegetable oils that will enable the capital costs of biodiesel production to be largely decreased, thereby making biodiesel an affordable and competitive fuel. In this study, optimization of biodiesel, or fatty acid methyl ester (FAME) production from waste cooking oil (WCO) was investigated using a batch OBR (diameter = 0.06 m, height = 0.55 m) with multi-orifice baffles, which have been recommended for scale-up. Response Surface Methodology (RSM) was applied to study the effects and interaction of different operating parameters: oscillation frequency (in the range 2.4-4.9 Hz), inter-baffle spacing (in the range 0.05-0.09 m) and reaction temperature (in the range 40-60°C). It was found that temperature is the main factor influencing reaction yield and the interaction between temperature and oscillation frequency is non-negligible. Inter-baffle spacing does not, however, have a significant effect on the reaction. This is different from the design recommendations of OBRs in the literature, which were originally developed for single orifice baffles. An optimal reaction yield of 81.9% was obtained with an oscillation frequency of 4.1 Hz and an inter-baffle spacing of 5 cm (i.e. approximately 1.5d e) at a temperature of 60°C. However, similar reaction yields could be obtained for different values of inter-baffle spacing.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of methyl ester production from waste cooking oil in a batch tri-orifice oscillatory baffled reactor

Soufi

Ghobadian

Najafi

et al. 2017

Fuel Processing Technology

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“…However, this may not necessarily be the best operating range for processes, e.g. Mazubert et al (2014) observed a decrease in the conversion of waste cooking oil into methyl esters for ;< > 0.1. The velocity ratio, ψ, describes the relationship between the oscillatory and net flow.…”

Section: Introductionmentioning

confidence: 99%

Predicting power consumption in continuous oscillatory baffled reactors

Avila

Fletcher

Poux

et al. 2020

Chemical Engineering Science

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Continuous oscillatory baffled reactors (COBRs) have been proven to intensify processes, use less energy and produce fewer wastes compared with stirred tanks. Prediction of power consumption in these devices has been based on simplistic models developed for pulsed columns with single orifice baffles several decades ago and are limited to certain flow conditions. This work explores the validity of existing models to estimate power consumption in a COBR using CFD simulation to analyse power density as a function of operating conditions (covering a range of net flow and oscillatory Reynolds numbers: !" #$% = 6 − 27 / !"-= 24 − 96) in a COBR with a single orifice baffle geometry. Comparison of computed power dissipation with that predicted by the empirical quasi-steady flow models shows that this model is not able to predict correctly the values when the flow is not fully turbulent, which is common when operating COBRs. It has been demonstrated that dimensionless power density is inversely proportional to the total flow Reynolds number in laminar flow and constant in turbulent flow, as is the case for flow in pipes and stirred tanks. For the geometry studied here (1/2) * = 330 !" 7 ⁄ in laminar flow and (1/2) * = 1.92 in turbulent flow.

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“…UCO as a feedstock for HDRD application has been adopted in recent times. The cheapest source of feedstock for the production of HDRD is UCO [30]. Rocha Filho et al reported that more than 200 000 tons of used cooking oil is generated in South Africa per/annum [31,32].…”

Section: Feedstock Optionsmentioning

confidence: 99%

Potential of Used Cooking Oil as Feedstock for Hydroprocessing into Hydrogenation Derived Renewable Diesel: A Review

Pelemo¹,

Inambao²,

Onuh³

2020

International Journal of Engineering Research and Technology

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Feedstock is one of the key resources for the production of hydrogenation derived renewable diesel (HDRD). Used cooking oil is a waste oil generated from vegetable oil after frying and can be easily sourced from domestic, restaurant outlet and food processing industries within the Durban metropolis. The right selection of feedstock contributes to the high yield and quality of HDRD. Current works on several vegetable oil sources for potential feedstock applications are reviewed. Good quality and optimal yields of HDRD can be obtained by proper selection of potential feedstock, the right catalyst, and optimal process parameters for desirable reaction pathway etc. The literature on vegetable oil as potential feedstock is discussed. Literature regarding the selection of catalysts for hydrogenation is reviewed. Biomass-based thermal power plants fly ash (BBTPPFS) and calcium oxide sourced from eggshell are identified as viable catalysts for the HDRD process.

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Intensification of waste cooking oil transformation by transesterification and esterification reactions in oscillatory baffled and microstructured reactors for biodiesel production

Cited by 25 publications

References 14 publications

Optimization of methyl ester production from waste cooking oil in a batch tri-orifice oscillatory baffled reactor

Optimization of methyl ester production from waste cooking oil in a batch tri-orifice oscillatory baffled reactor

Predicting power consumption in continuous oscillatory baffled reactors

Potential of Used Cooking Oil as Feedstock for Hydroprocessing into Hydrogenation Derived Renewable Diesel: A Review

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