Reactors in Process Engineering

Foutch, Gary L.; Johannes, Arland H.

doi:10.1016/b0-12-227410-5/00654-2

Cited by 23 publications

(14 citation statements)

References 5 publications

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“…For the baffled reactor, only about 10 min was required. This finding confirms the hypothesis that the reactor with rapidly-spinning blades also requires baffles to help improve the heat and mass transfer, as well as flow pattern of liquid resulting in rapid temperature rise causing the endothermic reaction to move forward 34 . They work by disrupting the flow pattern and keeping the movement of the top to the bottom fluid to promote radially axial circulation of the fluid 37 .…”

Section: Resultssupporting

confidence: 84%

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Low-cost alternative biodiesel production apparatus based on household food blender for continuous biodiesel production for small communities

Wongjaikham

Wongsawaeng

Ratnitsai

et al. 2021

Sci Rep

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Fatty acid methyl esters (FAMEs) are sustainable biofuel that can alleviate high oil costs and environmental impacts of petroleum-based fuel. A modified 1200 W high-efficiency food blender was employed for continuous transesterification of various refined vegetable oils and waste cooking oil (WCO) using sodium hydroxide as a homogeneous catalyst. The following factors have been investigated on their effects on FAME yield: baffles, reaction volume, total reactant flow rate, methanol-oil molar ratio, catalyst concentration and reaction temperature. Results indicated that the optimal conditions were: 2000 mL reaction volume, 50 mL/min total flow rate, 1% and 1.25% catalyst concentration for refined palm oil and WCO, respectively, 6:1 methanol-to-oil molar ratio and 62–63 °C, obtaining yield efficiency over 96.5% FAME yield of 21.14 × 10–4 g/J (for palm oil) and 19.39 × 10–4 g/J (for WCO). All the properties of produced FAMEs meet the EN 14214 and ASTM D6751 standards. The modified household food blender could be a practical and low-cost alternative biodiesel production apparatus for continuous biodiesel production for small communities in remote areas.

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Section: Resultssupporting

confidence: 84%

“…For large rectors, the installation of baffles is common practice to provide more effective mixing and heat transfer in the reactor 34 . Without baffles, the fluid would spin freely without achieving good mixing and reaction yield.…”

Section: Resultsmentioning

confidence: 99%

Low-cost alternative biodiesel production apparatus based on household food blender for continuous biodiesel production for small communities

Wongjaikham

Wongsawaeng

Ratnitsai

et al. 2021

Sci Rep

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“…To accomplish this, it is necessary to find the most effective reactor configuration. In the case of a rapidly deactivating biocatalyst that is not being recycled, which is the case with the applied DERA enzyme, discontinuous reactors, such as the batch or semi‐batch reactor, represent an optimal solution . These reactors are preferred for small‐scale production of highly priced products because high conversion can be achieved per single batch.…”

Section: Resultsmentioning

confidence: 99%

2‐Deoxyribose‐5‐phosphate aldolase from Thermotoga maritima in the synthesis of a statin side‐chain precursor: characterization, modeling and optimization

Švarc

Blažević

Vasić-Rački

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Producing statin side‐chains by sequential aldol condensation catalyzed by 2‐deoxyribose‐5‐phosphate aldolase (DERA) (EC 4.1.2.4) is the best‐known and most promising synthetic route. The advantage of this process is the formation of two stereocenters in a single step starting from inexpensive achiral components, acetaldehyde and chloroacetaldehyde. The limitation for the industrial‐scale application is enzyme inactivation caused by substrates as well by the intermediate produced by single aldol addition. RESULTS The DERA enzyme from Thermotoga maritima (DERATm) was investigated extensively in this work. The influence of aldehydes on DERATm stability was studied in detail. Mathematical models in different reactor configurations were developed based on experimentally determined kinetic parameters of all reactions included in the synthesis of statin side‐chain. Models also included enzyme inactivation by all compounds with negative impact on its stability. Mathematical model‐based optimization enabled optimization of process conditions and reactor configuration. The fed‐batch reactor proved to be the most suitable choice achieving product concentration of 78 g L−1, productivity of 56 g L day−1 and yield of 95% under an optimal condition. CONCLUSION The validated mathematical model and applied methodology can be exploited for further process improvement and for process design of similar systems. © 2019 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…The effect of operating conditions on the CSTR's performance with a saponification experiment was conducted in [20] and the results showed that the increase in conversion scale may depend on the increase in CSTR's volume. The neural network approach was used in [21] in order to identify the dynamics of two states, namely the temperature and the concentration of the CSTR's model, and reasonable and precise results were obtained.…”

Section: Introductionmentioning

confidence: 99%

Markov Chain Monte Carlo Analysis of the Variable-Volume Exothermic Model for a Continuously Stirred Tank Reactor

Muhirwa¹,

Mbalawata

Masanja

2021

Eng. Technol. Appl. Sci. Res.

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In this paper, a variable-volume Continuously Stirred Tank Reactor (CSTR) deterministic exothermic model has been formulated based on the Reynold Transport Theorem. The numerical analysis of the formulated model and the identifiability of its physical parameters are done by using the least squares and the Delayed-Rejection Adaptive Metropolis (DRAM) method. The least square estimates provide the prior information for the DRAM method. The overall numerical results show that the model gives an insight in describing the dynamics of CSTR processes, and 14 parameters of the CSTR are well identified through DRAM convergence diagnostic tests, such as trace, scatter, autocorrelation, histograms, and marginal density plots. Global sensitivity analysis was further performed, by using the partial rank correlation coefficients obtained from the Latin hypercube sampling method, in order to study and quantify the impact of estimated parameters, uncertainties on the model outputs. The results showed that 7 among the 14 estimated model parameters are very sensitive to the model outcomes and so those parameters need to be handled and treated carefully.

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Reactors in Process Engineering

Cited by 23 publications

References 5 publications

Low-cost alternative biodiesel production apparatus based on household food blender for continuous biodiesel production for small communities

Low-cost alternative biodiesel production apparatus based on household food blender for continuous biodiesel production for small communities

2‐Deoxyribose‐5‐phosphate aldolase from Thermotoga maritima in the synthesis of a statin side‐chain precursor: characterization, modeling and optimization

Markov Chain Monte Carlo Analysis of the Variable-Volume Exothermic Model for a Continuously Stirred Tank Reactor

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