Estimation of kinetic coefficients in micro-reactors for biodiesel synthesis: Bayesian inference with reduced mass transfer model

Costa, Janira Martins; Naveira-Cotta, Carolina P.

doi:10.1016/j.cherd.2018.11.023

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…A typical example is when dealing with different molar ratio and/or flow rate of reactants, as in biodiesel synthesis in microreactors [24,25]. In accordance with the standard ASTM D6751-15 [26], biodiesel is made up by mono-alkyl esters of longchain fatty acids fuel, derived from vegetable oils and/or animal fats, commonly produced via transesterification reaction.…”

Section: Introductionmentioning

confidence: 99%

Mixing in flows past confined microfluidic cylinders: Effects of pin and fluid interface offsetting

Zhang

Cagney

Lacassagne

et al. 2020

Chemical Engineering Journal

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Introductionmentioning

confidence: 99%

Mixing in flows past confined microfluidic cylinders: Effects of pin and fluid interface offsetting

Zhang

Cagney

Lacassagne

et al. 2020

Chemical Engineering Journal

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“…3,7,10,13−17,25−32 The alcohols that are most frequently used in the transesterification process are methanol and ethanol because of their low cost, availability, and their physical and chemical properties. 33 Most of the studies that perform the synthesis of biodiesel through the transesterification reaction in micro reactors use methanol as the alcohol, 3,7,10,13,14,17,[24][25][26]28 while a few studies use ethanol. 27,29−31 Methanol, aside from being toxic, is usually produced from petrochemical materials, while ethanol is produced from biomass.…”

Section: Introductionmentioning

confidence: 99%

“…These reactors are composed of microchannels with transversal sections presenting different geometries and with hydraulic diameters smaller than 1 mm. These devices can achieve rapid reaction rates because of short diffusion distances and a high surface area/volume ratio, which improves (“intensifies”) heat and mass transfer. ,− …”

Section: Introductionmentioning

confidence: 99%

“…The alcohols that are most frequently used in the transesterification process are methanol and ethanol because of their low cost, availability, and their physical and chemical properties . Most of the studies that perform the synthesis of biodiesel through the transesterification reaction in micro reactors use methanol as the alcohol, ,,,,,,− , while a few studies use ethanol. ,− Methanol, aside from being toxic, is usually produced from petrochemical materials, while ethanol is produced from biomass . Thus, biodiesel produced from ethanol is completely derived from renewable sources. ,, In addition, Brazil is one of the largest ethanol producers in the world Because of these characteristics, ethanol was chosen to be used in the present study.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Metallic Microfluidic Device for Intensified Biodiesel Production

Costa

Naveira-Cotta

Moraes

et al. 2019

Ind. Eng. Chem. Res.

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We present a strategy for intensified biodiesel production in a novel metallic microdevice. Additive manufacturing using Selective Laser Melting (SLM) was employed to build the metallic device consisting of multiple micro reactors monolithically integrated with multiple micro heat exchangers. This device allows high conversion rate of biodiesel production with concomitant use of the rejected heat from external source to enhance the reaction temperature and, thereby, its output. The biodiesel production was carried out using soybean oil, ethanol and NaOH as the catalyst. The influences of the reaction temperature and the residence time in the biodiesel production was examined. Biodiesel yield increased with the reaction temperature and a rate of conversion of 99.6% was achieved with a reactor residence time of less than 35 seconds. The work opens up a pathway to exploit waste heat to intensify biodiesel production and contribute significantly to global sustainability.

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Bayesian parameter estimation using truncated normal distributions as priors for parameters in fundamental models of chemical processes

Gibson,

McAuley

2024

Can J Chem Eng

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Modellers of chemical processes with knowledge about plausible parameter values use Bayesian parameter estimation methods to account for their prior beliefs. Some modellers specify prior distributions with finite parameter ranges, such as uniform distributions and truncated normal distributions, because they better account for knowledge about realistic parameter ranges than normal prior distributions with parameter values ranging between and . We derive closed‐form objective functions for Bayesian parameter estimation with truncated normal priors and uniform priors, for the first time, so that parameter estimation can be performed by solving simple optimization problems rather than using complex sampling‐based techniques. A parametric bootstrapping method that considers truncated normal priors and model nonlinearity is proposed to determine 95% confidence intervals and joint confidence regions. A pharmaceutical case study is used to show the effectiveness of the proposed objective functions and bootstrapping methodology. Confidence regions from bootstrapping are similar to linearization‐based confidence regions that do not account for truncation when truncated areas in normal prior distributions are relatively small. More truncation, which corresponds to more‐precise prior knowledge about the parameters, results in smaller joint confidence regions. The proposed methods will be attractive for parameter estimation in complex process models because they can be less computationally intensive than Markov chain Monte Carlo methods that provide similar results.

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Estimation of kinetic coefficients in micro-reactors for biodiesel synthesis: Bayesian inference with reduced mass transfer model

Cited by 12 publications

References 41 publications

Mixing in flows past confined microfluidic cylinders: Effects of pin and fluid interface offsetting

Mixing in flows past confined microfluidic cylinders: Effects of pin and fluid interface offsetting

Innovative Metallic Microfluidic Device for Intensified Biodiesel Production

Bayesian parameter estimation using truncated normal distributions as priors for parameters in fundamental models of chemical processes

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