Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods

Almagrbi, Abdualnaser Muftah; Hatami, Tahmasb; Glišić, Sandra B.; Orlović, Aleksandar M.

doi:10.2298/hemind130118037a

Cited by 11 publications

(11 citation statements)

References 25 publications

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“…In more details, the error function F (k i , n) represented by Equation 11, was minimized in order to get k i and n by using the Levenberg-Marquardt algorithm. This "curve-fitting" procedure is a standard tool in computing and it is extensively used for non-linear least squares problems [56,57].…”

Section: Kinetics Modelmentioning

confidence: 99%

Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling

2019

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Olive trimmings (OT) were used as feedstock for an in-depth experimental study on the reaction kinetics controlling hydrothermal carbonization (HTC). OT were hydrothermally carbonized for a residence time τ of up to 8 h at temperatures between 180 and 250 °C to systematically investigate the chemical and energy properties changes of hydrochars during HTC. Additional experiments at 120 and 150 °C at τ = 0 h were carried out to analyze the heat-up transient phase required to reach the HTC set-point temperature. Furthermore, an original HTC reaction kinetics model was developed. The HTC reaction pathway was described through a lumped model, in which biomass is converted into solid (distinguished between primary and secondary char), liquid, and gaseous products. The kinetics model, written in MATLABTM, was used in best fitting routines with HTC experimental data obtained using OT and two other agro-wastes previously tested: grape marc and Opuntia Ficus Indica. The HTC kinetics model effectively predicts carbon distribution among HTC products versus time with the thermal transient phase included; it represents an effective tool for R&D in the HTC field. Importantly, both modeling and experimental data suggest that already during the heat-up phase, biomass greatly carbonizes, in particular at the highest temperature tested of 250 °C.

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Section: Kinetics Modelmentioning

confidence: 99%

Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling

2019

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“…Here, we propose using genetic algorithms (GA) for determining the optimal parameters of fractional order PID controllers, [22]. Recently, GA has been recognized as an effective and efficient technique to solve optimization problems [23]. GA is a search technique that manipulates the coding representation of a parameter set to search a near optimal solution through cooperation and competition among the potential solutions.…”

Section: Optimal Tuning Of Fopid By Using Gamentioning

confidence: 99%

“…In this paper, we propose and elaborate new optimal algorithms of fractional PID control based on genetic algorithms (GA) in the production of technical gases, i.e., in the cryogenic air separation process. GAs have received much interest in recent years [21][22][23], the basic operating principles of GA being based on the principles of natural evolution. GA is a stochastic global adaptive search optimization technique based on the mechanisms of natural selection.…”

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confidence: 99%

The fractional PID controllers tuned by genetic algorithms for expansion turbine in the cryogenic air separation process

Bucanovic

Lazarević

Batalov

2014

Hem Ind

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This paper deals with the design of a new algorithm of PID control based on fractional calculus (FC) in production of technical gases, i.e. in a cryogenic air separation process. Production of low pressure liquid air was first introduced by P.L. Kapitsa and involved expansion in a gas turbine. For application in the synthesis of the control law, for the input temperature and flow of air to the expansion turbine, it is necessary to determine the appropriate differential equations of the cryogenic process of mixing of two gaseous airflows at different temperatures before entrance to the expansion turbine. Thereafter, the model is linearized and decoupled and consequently classical PID and fractional order β α PI D controllers are taken to assess the quality of the proposed technique. A set of optimal parameters of these controllers are achieved through the genetic algorithm optimization procedure by minimizing a cost function. Our design method focuses on minimizing performance criterion which involves IAE, overshoot, as well as settling time. A time-domain simulation was used to identify the performance of β α PI D controller with respect to a traditional optimized PID controller.

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“…The final products, appearing as products of the third reaction, are glycerol (GL) and again fatty acid methyl esters (FAME). The reaction scheme is shown below [1][2][3][4][5]:…”

Section: Introductionmentioning

confidence: 99%

“…It is important to point out that the reversible reactions of DG, MG and GL with FAME control the maximum/equilibrium conversion of triglycerides. The most important factors affecting in the transesterification reactions are; the type and concentration of catalyst, type of alcohol, molar ratio of alcohol to oil, reaction temperature, residence time, presence of free fatty acids and moisture [1][2][3][4]6].…”

Section: Introductionmentioning

confidence: 99%

Production of Fatty Acid Methyl Ester from Microalgae Using Microwave: Kinetic of Transesterification Reaction Using CaO Catalyst

Hindarso¹

2018

AJCHE

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Biodiesel, an alternative diesel fuel made from renewable sources such as vegetable oils and animal fats, is becoming prominent among alternatives to conventional petro-diesel due to economic, environmental and social factors. Transesterification is the most preferred method of biodiesel production. Knowledge of transesterification reaction kinetic enables prediction of the extent of the chemical reaction at any time under particular conditions. It is also essential in the design of reactors for biodiesel production in industrial scale, determination of kinetic model and optimization of operation conditions. In this study, a mathematical model for the microwave assisted trans-esterification reaction of microalgae and methanol has been developed to study the effect of the operating parameters on the process kinetics. A well-mixed microwave reactor was used to express the laboratory scale microwave reactor at stirring speed 500 rpm. Mass transfer controlled state was assumed to be minimal using the stirring condition. The model developed was based on experimental data described in a previous study. The experimental works were designed to study the effect of reaction time between 1-5 min; power of microwave of 100-400 W, and an amount of CaO catalyst of 1 and 3%. The use of a solid catalyst effectively reduces the purification cost of biodiesel due to ease of separation and potential for reuse. The molar ratio of microalgae oil and methanol was constant at the ratio of 1: 6. The validation of model indicated that the reaction have second order reaction in terms of triglycerides. A very good correlation between model and experiment data was observed by correlation coefficient (R 2) and least square curve fit. In addition, the experiment shows that the best conditions for reaction time were 5 min, power of microwave was 400 W and amount of CaO catalyst was 3%. The maximum yield of biodiesel in the best conditions was 93.23%.

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Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods

Cited by 11 publications

References 25 publications

Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling

Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling

The fractional PID controllers tuned by genetic algorithms for expansion turbine in the cryogenic air separation process

Production of Fatty Acid Methyl Ester from Microalgae Using Microwave: Kinetic of Transesterification Reaction Using CaO Catalyst

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