Extractive desulfurization in microchannels with polyethylene glycol 400: An experimental study and mass transfer evaluation

Santiago, Luiz Eduardo Pereira; Silva, Maxwell G.; Sobrinho, Eledir V.; Ruiz, Juan A.C.; Padilha, Carlos Eduardo de Araújo; Souza, Domingos F.S.

doi:10.1016/j.cep.2022.109096

Cited by 4 publications

(17 citation statements)

References 26 publications

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“…In our previous work, Santiago et al, it was shown that working in the slug regime is a decisive factor for extraction in microdevices. In this flow pattern, the recirculation movement responsible for increasing mass transfer, along with the shear forces that attenuate the size of the slugs, promotes the maximization of extractive performance.…”

Section: Resultsmentioning

confidence: 95%

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Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

Santiago,

Silva,

Sobrinho

et al. 2023

Ind. Eng. Chem. Res.

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Conventional methods for removing sulfur compounds perform poorly when streams are treated with refractory compounds such as dibenzothiophene (DBT) and its derivatives. Current studies have directed efforts to investigate extractive desulfurization (EDS) using microdevices. Microdevices are units with micrometer-sized channels that enhance the mass and heat transfer phenomena. For EDS in microdevices to be viable, it is essential to choose the appropriate extractor solvent. Among the possibilities, an excellent candidate is polyethylene glycol (PEG). The present work aims to analyze the use of PEG 300 for EDS in microfluidics using hexadecane as a model fuel to emulate diesel. The experiments followed the logic of a fractional experimental design that allowed extractive solvent insights into deep desulfurization. In addition, the mass transfer phenomena involved and the application of the best experimental conditions in a real diesel sample were evaluated. The results obtained with model fuel were able to achieve 99.36% DBT removal with a 1.0 min residence time, a 1:1 volumetric ratio, and three extraction cycles. Furthermore, by applying the best experimental conditions to diesel, the total sulfur concentration decreased from 1646 to 312 ppm, resulting in an extractive efficiency of 81.04%.

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Section: Resultsmentioning

confidence: 95%

“…This behavior indicates that process equilibrium is reached after about 2.0 min. In this way, the increase of contact time should not be made indiscriminately because no significant gains are obtained and the time between experiments increases, as shown by different works in the literature. ,,, …”

Section: Resultsmentioning

confidence: 99%

Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

Santiago,

Silva,

Sobrinho

et al. 2023

Ind. Eng. Chem. Res.

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“…The residence time is directly related to the microchannel length. Therefore, an increase in the microchannel length results in an increase in the residence time and a subsequent increase in sulfur removal. ,, As can be seen in Figure a, sulfur removal is more sensitive to the variation in the microchannel length at an RF/D of 1 compared to an RF/D of 5.…”

Section: Resultsmentioning

confidence: 96%

“…The main flow patterns observed in the microchannels are the slug flow, the droplet flow, the annular flow, and the parallel flow. − Based on our knowledge, there are fewer investigations on the flow pattern maps of liquid–liquid flow in microchannels compared to gas–liquid flow. Moreover, as reported in Table , there is a lack of information on the flow pattern of the EDS process in the microchannels. ,− It should be noted that the previous articles did not provide a sufficient illustration of the various flow regime types. Additionally, the application of RSM for the optimization of the EDS in microchannels is limited to the study of Al-Azzawi et al To fill this research gap, the main focus of the present study is to employ the RSM for the optimization of EDS in the microchannels, considering the sulfur removal and appropriate flow pattern.…”

Section: Introductionmentioning

confidence: 99%

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Extractive Desulfurization in Microchannel Contactors Using Deep Eutectic Solvents: Optimization Using Central Composite Design (CCD) and Flow Pattern Mapping

Mahdavi,

Sobati,

Movahedirad

2023

Energy Fuels

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In the present study, the optimization of extractive desulfurization in the microchannels was investigated using a deep eutectic solvent (DES). The influence of some operating and microchannel geometrical parameters, including the initial sulfur concentration of fuel, the length of the microchannel, the DES flow rate, and the ratio of fuel to DES flow rate (RF/D), on sulfur removal was investigated using response surface methodology (RSM). Moreover, the flow pattern map in the microchannels was investigated. In this regard, different flow patterns of slug, lengthy slug, smooth annular, throat annular, wavy annular, and droplet were observed in the microchannels applied in the extractive desulfurization (EDS) process. Besides, the effects of the inertial force, interfacial tension force, and viscosity force on the different flow patterns were discussed by analyzing the capillary number, the Weber number, and the Reynolds number. It was found that the most effective regime in the EDS process in the microchannel is the slug flow pattern in which the interfacial tension force (6 × 10 −5 < Weber number < 0.82767) is dominant. Based on the analysis of the RSM proposed model, it was also found that the RF/D is the main influential parameter on sulfur removal, and 73.2% sulfur removal was achieved in the microchannel under the optimum conditions in a very short residence time of 2.5 s. The results also confirmed the capability of this EDS process for sulfur removal from real diesel fuel.

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Intensification of extractive desulfurization in micro-channels using triethylamine/propionic acid as deep eutectic solvent

Mahdavi

Sobati

Movahedirad

2023

Chemical Engineering and Processing - Process Intensification

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Extractive desulfurization in microchannels with polyethylene glycol 400: An experimental study and mass transfer evaluation

Cited by 4 publications

References 26 publications

Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

Extractive Desulfurization in Microchannel Contactors Using Deep Eutectic Solvents: Optimization Using Central Composite Design (CCD) and Flow Pattern Mapping

Intensification of extractive desulfurization in micro-channels using triethylamine/propionic acid as deep eutectic solvent

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