The effect of flux and residence time in the production of biodiesel from various feedstocks using a membrane reactor

Falahati, Hamid; Tremblay, André Y.

doi:10.1016/j.fuel.2011.06.019

Cited by 35 publications

(18 citation statements)

References 20 publications

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“…Unreacted oils (di-and triglycerides) can also form droplets in membrane reactors - Falahati and Tremblay (2012) found that the droplets comprised a bimodal size distribution whose characteristics depended on the original oil. In their case, waste cooking oil formed larger droplets than unprocessed canola oil, allowing for ease of separation of these unreacted oils due to size exclusion.…”

Section: Phase Behavior In Membrane Separationmentioning

confidence: 99%

“…A steady state transmembrane pressure could not be obtained for residence times of 35 min, dramatically increasing to over 350 kPa in less than 20 min. By increasing residence time to 60 min, the transmembrane pressure could then stabilize for canola oil -the authors tested a variety of feedstocks at this minimum residence time, determining that higher residence times were needed for certain feedstocks to stabilize the pressure at manageable levels (65 min for corn oil and 80 min for waste cooking oil) (Falahati and Tremblay, 2012).…”

Section: Membrane Bioreactors For Biodiesel Processingmentioning

confidence: 99%

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A comprehensive review on biodiesel purification and upgrading

2017

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HIGHLIGHTS Various biodiesel purification methods, i.e., equilibrium-based, affinity-based, and reaction-based separation techniques along with membrane technology and solid-liquid separation processes were reviewed.Deoxygenating process via hydrodeoxygenation and decarboxylation/decarbonylation pathways is a common way to upgrade bio-based oils to produce biorenewable diesel with excellent fuel properties. Catalysts and operating conditions, i.e., pressure, temperature, and contact time, are the most important variables in biodiesel upgrading discussed herein. Serious environmental concerns regarding the use of fossil-based fuels have raised awareness regarding the necessity of alternative clean fuels and energy carriers. Biodiesel is considered a clean, biodegradable, and non-toxic diesel substitute produced via the transesterification of triglycerides with an alcohol in the presence of a proper catalyst. After initial separation of the by-product (glycerol), the crude biodiesel needs to be purified to meet the standard specifications prior to marketing. The presence of impurities in the biodiesel not only significantly affects its engine performance but also complicates its handling and storage. Therefore, biodiesel purification is an essential step prior to marketing. Biodiesel purification methods can be classified based on the nature of the process into equilibrium-based, affinity-based, membrane-based, reaction-based, and solid-liquid separation processes. The main adverse properties of biodiesel -namely moisture absorption, corrosiveness, and high viscosity -primarily arise from the presence of oxygen. To address these issues, several upgrading techniques have been proposed, among which catalytic (hydro)deoxygenation using conventional hydrotreating catalysts, supported metallic materials, and most recently transition metals in various forms appear promising. Nevertheless, catalyst deactivation (via coking) and/or inadequacy of product yields necessitate further research. This paper provides a comprehensive overview on the techniques and methods used for biodiesel purification and upgrading. ABSTRACT

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Section: Phase Behavior In Membrane Separationmentioning

confidence: 99%

Section: Membrane Bioreactors For Biodiesel Processingmentioning

confidence: 99%

A comprehensive review on biodiesel purification and upgrading

2017

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“…The biodiesel is usually washed till the pH is neutral. Falahati and Tremblay [12] utilized various feedstocks (canola, sunflower, and corn) for the synthesis of biodiesel. The water and FAAE ratio of 1:4 was adopted for washing of crude biodiesel from edible oil only once which was followed by either dry washing or cold filtration to remove monoglycerides.…”

Section: Refining Techniques For Crude Biodieselmentioning

confidence: 99%

“…The advantage of edible oil as a feedstock for production of biodiesel is their low free fatty acid (FFA) content (i.e. 41%) which allow single step transesterification of the oil [12]. Edible oil feedstocks that are used worldwide in synthesis of biodiesel are soybean, rapeseed, palm, and sunflower [13].…”

Section: Introductionmentioning

confidence: 99%

Towards a sustainable approach for development of biodiesel from plant and microalgae

Singh

Guldhe

Rawat

et al. 2014

Renewable and Sustainable Energy Reviews

260

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“…Therefore, many intensification technologies have been studied to overcome these limitations. Several technological approaches to remove the products during the reaction have been proposed, namely membrane reactors [14][15][16], reactive absorption [17] and reactive distillation [18], which can drive the reaction forward and overcome the equilibrium, thus giving a high biodiesel yield. The design of vigorous mixing reactors such as bubble column reactors [19], rotating packed bed reactors [20] and jet flow stirred reactors [21] have been proposed as means to overcome reactant insolubility.…”

Section: Introductionmentioning

confidence: 99%

Combined Enabling Technologies for Biodiesel Production in Flow Processes

Cravotto

Choedkiatsakul

2014

Production of Biofuels and Chemicals With Microwave

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Alternative energy sources and fuels have been investigated to indemnify the higher demand of natural fuels that requires very long time for their formation. In the last 40 years several renewable energy sources have been developed. In this context biodiesel play an important role because its high heating values nearly equivalent to diesel fuels and its low environmental impact. The sustainability of the process is strongly related to the type of oil source and to the overall energy consumption. The aim of this chapter is to highlight the synergistic effects on process efficiency by combining different activation techniques such as microwaves, ultrasound, hydrodynamic cavitation and high-shear mixing. A big effort has been done in the search of new highly efficient reactors to produce biodiesel saving time and energy. Inefficient mass transfer is one of the main limitations in biphasic heterogeneous reactions such as transesterification. Although many types of vigorous mixing have been investigated to address this requirement, most of them suffer of high energy demand. The dielectric heating has been proved to dramatically enhance transesterification reaction because the excellent heat transfer if compared with conventional methods. Thanks to an optimal mass/heat transfer a full triglycerides conversion to methyl esters can be achieved in flow reactors in a very short time either in continuous or semi-continuous mode. Moreover, in accordance with international specifications and analytical ASTM standards, very fast treatments may produce a high-quality biodiesel. The high efficiency and the low energy consumption enable an easy scale up of the process.

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The effect of flux and residence time in the production of biodiesel from various feedstocks using a membrane reactor

Cited by 35 publications

References 20 publications

A comprehensive review on biodiesel purification and upgrading

A comprehensive review on biodiesel purification and upgrading

Towards a sustainable approach for development of biodiesel from plant and microalgae

Combined Enabling Technologies for Biodiesel Production in Flow Processes

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