Kinetics of sunflower oil methanolysis at low temperatures

Stamenković, Olivera S.; Todorović, Zoran B.; Lazić, Miodrag L.; Veljković, Vlada B.; Skala, Dejan

doi:10.1016/j.biortech.2007.02.028

Cited by 160 publications

(117 citation statements)

References 12 publications

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“…The measurement may be conducted from triglyceride phase which has high resistance or methanol phase with high conductivity. Mass transfer resistance influence is clearly feasible in low temperature compare with high temperature [24]. As the vegetable oil has high viscosity in lower temperature, heating the oil during the transesterification process will do a favour to speed up the process by shortening mass transfer control region time.…”

Section: B Results and Discussionmentioning

confidence: 99%

“…As resistance line is measure of ion transport, in this case disperse methanol in to the vegetable oil. Furthermore, the slop of ion distribution is represented mass transfer progress, and this slope is highly affected by droplet size of dispersed methanol and it reduces rapidly with progress of transesterification process [24]. The mass transfer resistance is caused by small availability of active specific catalyst surface, which is mainly covered by adsorbed molecules of methanol [26].…”

Section: B Results and Discussionmentioning

confidence: 99%

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Monitoring of Biodiesel Transesterification Process Using Impedance Measurement

Rachmanto¹,

Allanson²,

Matthews³

et al. 2014

IJMMM

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Abstract-Transesterification is commonly used to produce biodiesel from methylester. In order to control the conversion process it is often useful to employ process monitoring and in particular monitor the mass transfer processes that limit the initial reaction rates. Such monitoring of the initial phase of reaction may provide opportunity for process optimization. Previous work has identified many methods to monitor reaction progress. This paper proposes the use of a simple method which is able to provide information regarding the progress of mass transfer and chemical reaction during biodiesel production. The process uses impedance measurement. The experimentally determined impedance results clearly show the two important phases of the transesterification reaction, a mass transfer control phase followed by a kinetically controlled phase.

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Section: B Results and Discussionmentioning

confidence: 99%

Section: B Results and Discussionmentioning

confidence: 99%

Monitoring of Biodiesel Transesterification Process Using Impedance Measurement

Rachmanto¹,

Allanson²,

Matthews³

et al. 2014

IJMMM

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“…Pregled dosadašnjih ispitivanja mehanizama i kinetičkih modela homogeno bazno katalizovane metanolize različitih uljnih sirovina dat je u tabeli 1. Reakcija homogene katalizovane metanolize se, generalno, dešava najpre u heterogenom režimu, a zatim u pseudo-homogenom režimu, u kojima je kinetika ukupne reakcije kontrolisana prenosom mase i hemijskom reakcijom, respektivno [19][20][21][22][23]. Pri velikim brzinama mešanja reakcione smeše i dovoljno visokim temperaturama reakcije, vreme trajanja početnog perioda u kome prenos mase određuje brzinu procesa se skraćuje, zbog čega je zanemaren pri modelovanju kinetike ukupne reakcije metanolize.…”

Section: Uvodunclassified

“…[26] su pokazali da je kinetički model nepovratne reakcije pseudo-drugog reda najadakvetniji za modelovanje kinetike etanolize palminog ulja katalizovane natrijum etoksidom. Kinetički model nepovratne reakcije pseudo-drugog reda primenjen je za modelovanje reakcije etanolize ulja suncokreta u početnom periodu reakcije [35] i metanolize ulja suncokreta u srednjem periodu brze reakcije koji sledi posle početnog perioda limitiranog maseno-prenosnim ograničenjima [21]. Slika 2.…”

Section: Rezultati I Diskusijaunclassified

The biodiesel production from the cotton thistle seed oil (Onopordum acanthium L.)

Kostić¹,

Jokovic²,

Stamenković³

et al. 2014

Savr tehnol

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2 Prirodno-matematički fakultet, Odsek Biologija i Ekologija, Univerzitet u Nišu, Niš, Srbija Ulje semena korovske biljke magareći trn (Onopordum acanthium L.) je korišćeno za sintezu metil estara masnih kiselina. Zbog većeg kiselinskog broja ulja, primenjen je dvostepeni proces koji uključuje esterifikaciju slobodnih masnih kiselina u ulju katalizovanu H2SO4 i metanolizu esterifikovanog ulja katalizovanu KOH. Kinetika reakcije metanolize esterifikovanog ulja je modelovana primenom nepovratne reakcije pseudo-prvog reda i pseudo-drugog reda. Izračunate su konstante brzine reakcije metanolize i energije aktivacije. Adekvatnost modela procenjivana je na osnovu vrednosti R 2 linearnih zavisnosti i srednjeg relativnog procentnog odstupanja eksperimentalnih i izračunatih vrednosti stepena konverzije triacilglicerola. Iako su oba kinetička modela pogodna za fitovanje eksperimentalnih podataka, veća tačnost je ostvarena primenom modela nepovratne reakcije pseudo-drugog reda. Karakteristike dobijenog biodizela su, generalno, u okviru vrednosti propisanih standardom kvaliteta bodizela EN14214. Zbog toga, seme O. acanthium L. može biti korišćeno kao jeftina sirovina za sintezu biodizela.Ključne reči: dvostepeni process; biodizel; kinetika; magareći trn; metanoliza; Onopordum acanthium L. UvodDemografska ekspanzija i razvoj industrije uslovljavaju kontinualno povećanje potreba za energijom, zbog čega su mnogobrojna istraživanja usmerena ka pronalaženju novih, alternativnih izvora energije: iskorišćenju energije biomase, sunca, vetra, talasa i plime i oseke. U sektoru transporta najčešću primenu imaju goriva dobijena iz biomase, među kojima značajno mesto zauzima biodizel. Biodizel predstavlja ekološki "čisto" gorivo, biorazgradivo i manje toksično u odnosu na dizel fosilnog porekla, koje se dobija iz obnovljivih sirovina i pogodno je za primenu u dizel motorima. Dobija se postupkom alkoholize biljnih ulja ili životinjskih masti sa nižim alifatičnim alkoholima. Najčešće korišćeni alkoholi u sintezi biodizela su metanol, a u poslednje vreme i etanol [1]. Za dobijanje biodizela trenutno se najčešće koriste jestiva biljna ulja, kao što su: ulje uljane repice, soje, suncokreta ili palme [2]. Međutim, korišćenje jestivih ulja u procesima dobijanja biodizela ograničavaju njihova primarna primena u ljudskoj ishrani i visoka cena. S obzirom da u ukupnoj ceni proizvodnje biodizela uljne sirovine imaju najveći udeo [3,4], poslednjih godina pažnju istraživača privlači ispitivanje mogućnosti primene novih i jeftinijih ulja kao što su ulja dobijena iz semena različitih korovskih biljaka:Magareći trn ili čkalj (Onopordum acanthium L.) je korovska biljka koja pripada familiji Asteraceae. Ova familija biljaka predstavlja najobimniju familiju dikotiledonih skrivenosemenica. Njihova primena je široka, kako u narodnoj medicini za lečenje povišenog krvnog pritiska [10], tako i u hemijskoj industriji za proizvodnju biogoriva pirolizom [11] ili likvefakcijom [12] biomase. U dosadašnjim istraživanjima ulje semena Onopordum acanthium L. nije ispit...

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“…Investigations into the transesterification reaction have shown that it transitions from a biphasic liquid mixture (oil and methanol) to another biphasic mixture (FAME and glycerol) via a pseudo-single phase emulsion (Noureddini and Zhu, 1997;Stamenkovic et al, 2007;Stamenkovic et al, 2008). Throughout the reaction a continuous non-polar phase (Oil, FAME and reaction intermediates) and a dispersed polar phase (methanol, glycerol and catalyst) are present with the composition of the phases constantly changing.…”

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confidence: 99%

Development and validation of a two phase CFD model for tubular biodiesel reactors

Boer

Bahri

2015

Computers & Chemical Engineering

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The use of biodiesel as an alternative to diesel has gained increasing momentum over the past 15 years. To meet this growing demand there is a need to optimise the transesterification reactor at the heart of the biodiesel production system. Assessing the performance of innovative reactors is difficult due to the liquid-liquid reaction mixture that is affected by mass transfer, reaction kinetics and component solubility. This paper presents a Computational Fluid Dynamic model of a tubular reactor developed in ANSYS CFX that can be used to predict the onset of mixing via turbulent flow. In developing the model an analysis of the reaction mixture is provided before the presentation of experimental data, which includes flow visualisation results and temperature dependant viscosity and density data for each phase. The detailed data and model development procedure represents an advancement in the modeling of the two phase transesterification reaction used in biodiesel production..

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Kinetics of sunflower oil methanolysis at low temperatures

Cited by 160 publications

References 12 publications

Monitoring of Biodiesel Transesterification Process Using Impedance Measurement

Monitoring of Biodiesel Transesterification Process Using Impedance Measurement

The biodiesel production from the cotton thistle seed oil (Onopordum acanthium L.)

Development and validation of a two phase CFD model for tubular biodiesel reactors

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