Kinetics of biodiesel synthesis from sunflower oil over CaO heterogeneous catalyst

Vujicic, Dj.; Comic, D.; Zarubica, Aleksandra; Mićić, Radoslav; Bošković, Goran

doi:10.1016/j.fuel.2009.11.043

Cited by 205 publications

(101 citation statements)

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“…Considering a three-phase reaction system (methanol, oil, and catalyst), such rate might be due to possible mass transfer limitations, and the time needed to form the reactive methoxide phase over the catalyst surface may delay the BD production, all this followed by a possible pseudo second-order reaction rate on the early stages of the reaction [81]. In the second stage, when the BD production increases, the liquid phase of the reactant mixture might become more uniform and the methoxide complex forms faster in a two-phase reaction system (liquid-solid) leading to an increase in the reaction rate and at this stage the reaction rate has been reported to follow a pseudo-first-order reaction rate [53,80,[82][83][84][85][86]. The third stage is characterized by a decrease in the reaction rate that occurs due to the oil depletion (triglyceride source).…”

Section: Transesterification Kineticsmentioning

confidence: 99%

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Biodiesel from rapeseed oil (Brassica napus) by supported Li2O and MgO

Solis

Berkemar

Alejo

et al. 2016

Int J Energy Environ Eng

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Vegetable oils are a vast triglyceride source for biodiesel production; i.e. fatty acid methyl esters (FAME), with methanol and a catalyst via transesterification reaction. The aim of this work was to study heterogeneously catalysed biodiesel production with solid oxides such as mayenite (Ca 12 Al 14 O 33 ) and alumina (Al 2 O 3 ) as catalyst carriers using edible rapeseed oil as feedstock. These oxides were impregnated to have Li 2 O and MgO concentrations of 5-10 and 5-30 wt% on each carrier, respectively. The catalysts were characterized using N 2 -physisorption (BET/BJH), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The synthesized catalysts were mesoporous ranging from 119 to 401 Å and their chemical phase composition was confirmed by the XRD. The catalyst coating (MgO/Li 2 O) was studied, along with the catalyst amount in the reactor and the assessment of the transesterification reaction kinetics. The reaction was studied at 60°C, atmospheric pressure, agitation rate of 180 rpm, and a reaction time of 2 h in a 6:1 molar ratio of methanol to oil. For each catalyst, loadings of 2.5, 5, and 10 wt% relative to the oil weight were evaluated. The highest biodiesel yield was obtained by 5 wt% (relative to oil weight) impregnated mayenite catalyst coated with 10 wt% of Li 2 O. The kinetic data fits to a pseudo-first-order model having a reaction rate constant equal to 0.045 min -1 under these mild reaction conditions.

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Section: Transesterification Kineticsmentioning

confidence: 99%

“…2, the overall conversion should follow a fourth order reaction rate law [84]. The way to steer the reaction towards the fatty acid methyl ester production is to use the methanol in excess.…”

Section: Transesterification Kineticsmentioning

confidence: 99%

Biodiesel from rapeseed oil (Brassica napus) by supported Li2O and MgO

Solis

Berkemar

Alejo

et al. 2016

Int J Energy Environ Eng

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“…The majority of other biodiesels possess lower oxidation and thermal stability [9, 10,11] with an inappropriate iodine number [9, 10,12] or inappropriate cold filter plugging points (CFPP) [9,13] and compressibility points (CP) [9,11,[13][14][15][16][17]. Exceptionally, the characteristics of the biodiesel obtained from algae position it high on the list of fuels for diesel engines [9,18].…”

Section: Introductionmentioning

confidence: 99%

Function K - As a Link Between Fuel Flow Velocity and Fuel Pressure, Depending on the Type of Fuel

et al. 2017

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Abstract. Regarding the application of vegetable oil based fuels in diesel engines, it is necessary to fully examine and understand the processes which take place in fuel delivery systems, namely, the processes of injection, mixture formation and combustion as well as emission characteristics. The paper provides an analysis of fuel flow in high pressure tubes of the fuel injection system, with the aim of determining function K as a link between fuel flow velocity and fuel pressure, and observing the influence of certain physical characteristics of the fuel upon the given function. The analysis presents the speed of sound and density, as fuel characteristics which affect the K function. The paper determines the speed of sound, density and bulk modulus for four fuels (pure rapeseed oil RO, biodiesel B100, a mixture of biodiesel and diesel B50, and diesel D), and forms appropriate K functions for each fuel in the pressure range from the atmospheric one to 1600 bar.

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“…Heterogeneous catalysts have great advantages over homogeneous catalystsas it requires easier catalyst operation andseparation, reuse and regenerate thus lowering the cost of production. Alkali metal oxides and derivatives [5,6], alkaline earth metal oxides and derivatives [7,8,9,10], transition metal oxides and derivatives [11,12], mixed metal oxides and derivatives [13][14][15][16][17], ion exchange resins type acid heterogeneous catalyst [18,19],carbon based heterogeneous catalysts [20,21], waste material based heterogeneous catalysts [22,23], enzyme based heterogeneous catalyst [24] were reported in the recent years and their uses in laboratory scale biodiesel production. But most heterogeneous catalyst has limitations such as they require high reaction time, high reaction temperature and low catalytic stability which gives low yield of product due to slow reaction rate.…”

Section: Introductionmentioning

confidence: 99%