Intensified transesterification of mixture of edible and nonedible oils in reverse flow helical coil reactor for biodiesel production

Gupta, Jharna; Agarwal, Madhu; Dalai, Ajay K.

doi:10.1016/j.renene.2018.11.057

Cited by 32 publications

(14 citation statements)

References 56 publications

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“…Various organic raw materials such as edible and non-edible vegetable oils obtained from soybean, − canola, neem, , jatropha, mustard, palm, , sun flower, − microalgae, mahua, rubber seed, animal fats, waste cooking oil, ,, etc., have been identified as potential sources of different generation biodiesels. , Since 70–95% of total biodiesel cost depends on the cost of feedstock, the use of edible oils for biodiesel production may cause lack of supply plus price fluctuation due to the competition with food consumption. Therefore, the use of non-edible oils is reliable for the synthesis of biodiesel through the transesterification of triglycerides in the presence of a strong alkaline catalyst, strong acid catalyst, and enzymes; glycerol (glycerin) is a by-product of the process . Apart from cheap raw material selection, the choice of an appropriate catalyst type at the right concentration is very crucial to acquire improved conversion for biodiesel cost reduction; the two main classes of catalysts used in the conversion system are heterogeneous and homogeneous catalysts .…”

Section: Introductionmentioning

confidence: 99%

NaOH-Catalyzed Methanolysis Optimization of Biodiesel Synthesis from Desert Date Seed Kernel Oil

Mekonnen

Sendekie

2021

ACS Omega

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Biodiesel synthesis from non-edible vegetable oil via catalytic transesterification is one of the effective ways to replace petroleum-based fuels in the area of renewable energy development and is beneficial to environmental security. Therefore, this research investigates the optimization of process parameters (temperature, methanol to oil ratio, and NaOH catalyst dose) for the conversion of biodiesel from non-edible desert date (Balanites Aegyptiaca) seed kernel oil using the Box–Behnken experimental design of response surface methodology statistical analysis. Accordingly, the optimum values of reaction conditions, namely, a temperature of 60.5 °C, methanol to oil ratio of 6.7:1, and catalyst dose of 0.79 %wt, yielded 93.16% biodiesel. Fourier transform infrared spectroscopy analysis confirmed the cracking of a single glycerol backbone from the triglycerides and the substitution by methoxyl in the presence of a NaOH catalyst. The physicochemical properties of the biodiesel were investigated and compared with standards in terms of its density, viscosity, higher heating value, acid value, saponification value, cetane number, cloud point, pour point, and flash point, and the values are within the recommended standard limits of American Standard for Testing Material (ASTM D6751) and European Committee for Standardization (EN14214). Thus, the results revealed that homogeneous base catalysis of non-edible oil under optimum reaction conditions provides high yield of biodiesel.

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Section: Introductionmentioning

confidence: 99%

NaOH-Catalyzed Methanolysis Optimization of Biodiesel Synthesis from Desert Date Seed Kernel Oil

Mekonnen

Sendekie

2021

ACS Omega

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“…It results in a secondary flow with a dipole-like velocity field development; further, the flow near the inner surface of the coil generates large eddies. Both behaviors help to improve the reactants mixture, resulting in an 8-9 times higher reaction efficiency than a batch reactor (Gupta et al 2019). Therefore, the microdevices design can be explored in different ways to achieve high efficiency by focusing, for example, on mild operational conditions and low-cost catalysts.…”

Section: Microdevices Designmentioning

confidence: 99%

Are Microreactors the Future of Biodiesel Synthesis?

Welter¹,

Silva²,

Souza³

et al. 2022

Preprint

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Microfluidic devices or microdevices refer to systems with a characteristic length in the micrometer range. Systems in this size allow handling small quantities of reagents and samples, with reduced residence time, better control of chemical species concentration, high heat and mass transfers, and high surface/volume ratio. These characteristics led to the application of these microdevices in several areas, such as biological systems, energy, liquid-liquid extraction, food, agricultural sectors, pharmaceuticals, flow chemistry, microreactors, and biodiesel synthesis. Microreactors are devices that have interconnected microchannels, in which small amounts of reagents are manipulated and react for a certain period of time. The traditional characteristics of microreactors are less quantities of reagents and samples, high surface area in relation to volume (10000 m2 m-3), reduction of resistance to heat and mass transfer, reduced reaction times, and narrower residence time distributions. In recent years, several studies have been carried out on biodiesel production in microreactors that explore the influence of operating conditions, mixing and reaction yield, numbering, and especially the microdevices design. Despite all the advantages of microreactors, the literature shows that there are only a few applications on an industrial scale. Two main reasons that hinder the adoption of this technology are the scale-up to a large enough volume to deliver the necessary production capacity and the costs related to industrial manufacturing microreactors. It is often stated that large-scale production of microreactors can be easily achieved by numbering-up. However, researches show that an incredibly high number of microdevices would be needed, which results in a technical unfeasibility and a strong impact on the construction costs of the industrial system. The present review aims to show whether microreactors can replace conventional biodiesel production processes and how this replacement technology could be carried out. The current chapter was divided into the following sections: Introduction, Synthesis and Purification of Biodiesel in Microreactors, Fundamentals of CFD, and Fundamentals of Scale-up. Finally, conclusions and future perspectives are exposed.

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“…Helical coils have attracted wide attention due to their high heat transfer efficiency, compact design, ease of manufacture and freedom from thermal deformation [1,2]. Over the past two decades, helical coils have been widely used in energy and cooling systems such as air conditioning [3,4], heat exchanger [5][6][7], steam generators [8,9], renewable energy [10,11] and energy storage [12,13], chemical and petroleum industries [14,15]. In helically coiled tubes, the centrifugal force induced by the oil geometry will exert upon the working fluid, which will lead to the second flows (Dean vortices) [16,17].…”

Section: Introductionmentioning

confidence: 99%

A data driven deep neural network model for predicting boiling heat transfer in helical coils under high gravity

Liang

Xie

Day

et al. 2021

International Journal of Heat and Mass Transfer

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Intensified transesterification of mixture of edible and nonedible oils in reverse flow helical coil reactor for biodiesel production

Cited by 32 publications

References 56 publications

NaOH-Catalyzed Methanolysis Optimization of Biodiesel Synthesis from Desert Date Seed Kernel Oil

NaOH-Catalyzed Methanolysis Optimization of Biodiesel Synthesis from Desert Date Seed Kernel Oil

Are Microreactors the Future of Biodiesel Synthesis?

A data driven deep neural network model for predicting boiling heat transfer in helical coils under high gravity

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