Monitoring the transesterification reaction with laser spectroscopy

Boni, Luis Alcides Brandini De; Silva, Isaac Newton Lima da

doi:10.1016/j.fuproc.2010.12.022

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…The measurements provide valuable information about the operating conditions and simultaneously give an estimate for critical variables by monitoring the state of a process and verifying that performance is optimal. There are methods to monitor the progress of the reaction, such as gas and liquid chromatography [9][10][11][12], Fourier transform infrared (FTIR), near-infrared (NIR), and nuclear magnetic resonance (NMR) spectroscopy methods [10,[12][13][14][15][16][17], measurement of refractive index [18], and viscosity [19]. Most of these methods require samples to be taken and offline analyses to be performed which include a pre-treatment of the sample.…”

Section: Introductionmentioning

confidence: 99%

Virtual Sensors for Biodiesel Production in a Batch Reactor

et al. 2017

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Fossil fuel combustion produces around 98% of coal emissions. Therefore, liquid and gaseous biofuels have become more attractive due to their environmental benefits. The biodiesel production process requires measurements that help to control and supervise the variables involved in the process. The measurements provide valuable information about the operation conditions and give estimations about the critical variables of the process. The information from measurements is essential for monitoring the state of a process and verifying if it has an optimal performance. The objective of this study was the conception of a virtual sensor based on the Extended Kalman Filter (EKF) and the model of a batch biodiesel reactor for estimating concentrations of triglycerides (TG), diglycerides (DG), monoglycerides (MG), methyl ester (E), alcohol (A), and glycerol (GL) in real-time through measurement of the temperature and pH. Estimation of the TG, DG, MG, E, A, and Gl through this method eliminates the need for additional sensors and allows the use of different types of control. For the performance analysis of the virtual sensor, the data obtained from the EKF are compared with experimental data reported in the literature, with the mean square error of the estimate then being calculated. In addition, the results of this approach can be implemented in a real system, since it only uses measurements available in a reactor such as temperature and pH.

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Section: Introductionmentioning

confidence: 99%

Virtual Sensors for Biodiesel Production in a Batch Reactor

et al. 2017

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“…V id = I id *R id (8) where V exc excitation voltage across the sensor, V id is the sensing voltage across the shunt series resistor R id and I id is flowing current across the resistor. The impedance of the sensor:…”

Section: International Journal Of Materials Mechanics and Manufacturmentioning

confidence: 99%

“…Trevisan also investigated the use of infrared spectroscopy to monitor a batch biodiesel reaction [7], DeBoni employed laser spectroscopy to monitor the transesterification process over a period of 6000s. His results indicated that a steady state was achieved after 2500 seconds [8]. The identified prior work has proven that it is possible to use simple methods to monitor the transesterification process and determine state of the reaction during the region controlled by the chemical reaction kinetics and that it may be possible to employ sensors for feedback control purposes.…”

Section: Introductionmentioning

confidence: 99%

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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“…The production of synthetic combustion fuels from biomass is the focus of a large number of research groups in Brazil and the world. Biodiesel is usually produced by the esterification reaction of free fatty acids or the transesterification reaction of triglycerides (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15).…”

Section: Introductionmentioning

confidence: 99%

The Production of Biodiesel Monitored With Real-Time Laser Spectroscopy. Confirmation of the Technique With Proton Nuclear Magnetic Resonance

Boni¹,

Maria²,

Pereira³

et al. 2013

SBJCHEM

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Biodiesel is a synthetic fuel usually produced by the transesterification reaction. This study was undertaken in order to monitor the kinetics of the transesterification reaction between soybean oil and methanol catalyzed by KOH and determine when the reaction reached chemical equilibrium. A series of reactions was monitored with a laser spectrometer used to analyze the absorption and scattering of light in real-time. The monitoring system combined the information received through multiple sensors. The correlation of the present technique with 1H-NMR spectra confirmed that the reaction was approaching chemical equilibrium when the monitoring curve showed asymptotic behavior.

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Monitoring the transesterification reaction with laser spectroscopy

Cited by 20 publications

References 17 publications

Virtual Sensors for Biodiesel Production in a Batch Reactor

Virtual Sensors for Biodiesel Production in a Batch Reactor

Monitoring of Biodiesel Transesterification Process Using Impedance Measurement

The Production of Biodiesel Monitored With Real-Time Laser Spectroscopy. Confirmation of the Technique With Proton Nuclear Magnetic Resonance

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