Non-catalytic biodiesel process with adsorption-based refining

Manuale, Débora Laura; Mazzieri, V. M.; Torres, Gerardo; Vera, Carlos Román; Yori, Juan Carlos

doi:10.1016/j.fuel.2010.10.047

Cited by 27 publications

(18 citation statements)

References 24 publications

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“…The presence of water at severe conditions results in vegetable oil and glycerol hydrolysis to FFAs which need to be separated during the biodiesel refining process. Manuale et al (2011) showed great potentials of silica-gel for separation of FFAs from the biodiesel produced from non-catalytic biodiesel production using supercritical methanol. The adsorption capacity of silica-gel was as high as 1.35 g per g of adsorbent while that value did not exceed 0.101 g per g of adsorbent for treated AC (Manuale et al, 2011).…”

Section: -Silica-based Absorbentsmentioning

confidence: 99%

“…Manuale et al (2011) showed great potentials of silica-gel for separation of FFAs from the biodiesel produced from non-catalytic biodiesel production using supercritical methanol. The adsorption capacity of silica-gel was as high as 1.35 g per g of adsorbent while that value did not exceed 0.101 g per g of adsorbent for treated AC (Manuale et al, 2011). Natural low silica content bentonite was also used for biodiesel purification.…”

Section: -Silica-based Absorbentsmentioning

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: -Silica-based Absorbentsmentioning

confidence: 99%

Section: -Silica-based Absorbentsmentioning

confidence: 99%

A comprehensive review on biodiesel purification and upgrading

2017

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show abstract

“…It can be supposed that as soon as it is formed glycerol reacts with other compounds in the reactor or is decomposed forming compounds of lower molecular weight [9,15,16]. In this sense many lateral reactions other than transesterification of glycerides and esterification of FFA seem also to occur in the supercritical reactor.…”

Section: Transesterification Reactionmentioning

confidence: 99%

“…Moreover water and FFA can give impetus to the reaction under certain conditions. For instance chicken oil and frying oil with very high FFA and water contents have been reported to be easily transformed into biodiesel with supercritical methanol [9].…”

Section: Introductionmentioning

confidence: 99%