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Biodiesel production from Mastic oil via electrolytic transesterification: optimization using response surface methodology and engine test

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Abstract

This study aimed to synthesize the biodiesel from Mastic oil by electrolysis method. Mastic gum is a potential and inexpensive feedstock for the biodiesel production. The oil content of Mastic gum was ~ 20% of the total gum weight. The gas chromatography–mass spectrometry (GC-MS) analysis was exploited to measure the oil’s fatty acid profile. The response surface methodology (RSM) via Box-Behnken design (BBD) was utilized to specify the best processing condition of the electrolytic transesterification process. According to the RSM-BBD results, the highest predicted biodiesel yield was 95% at the reaction time of 1 h, methanol to oil ratio of 4:1, and catalyst weight of 1.2 wt%. Under these conditions, the produced Mastic oil biodiesel was blended with the neat diesel at different volume ratios of 5:95 (B5), 10:90 (B10), and 15:85 (B15). These fuel mixtures were tested in a single-cylinder engine to assess engine performance and exhaust emissions. The experiments exhibited that blending biodiesel with diesel can slightly improve the engine performance. Moreover, the application of blends with high volumes of biodiesel decreased the exhaust emissions, such as carbon monoxide (CO), carbon dioxide (CO2), and unburned hydrocarbons (UHC) by 54.54%, 41%, and 39.3%, respectively. However, the nitrogen oxide (NOx) emission increased because of the higher oxygen content of the biodiesel. It was also found that the physical and chemical characteristics of the Mastic oil biodiesel are the same as diesel, consistent with the ASTM standard. The Fourier transform infrared (FTIR) analysis also confirmed the biodiesel production.

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Data availability

All data generated or analyzed during this study are included in this published article.

Abbreviations

A :

Reaction time

adj-R 2 :

Adjusted R2

AV :

Acid value

B :

Methanol to oil molar ratio

BP :

Brake power

BSFC :

Brake specific fuel consumption

BSEC :

Brake specific energy consumption

BTE :

Brake thermal efficiency

C :

Catalyst weight

CO2 :

Carbon dioxide

CO:

Carbon monoxide

CV :

Coefficient of variance

DF :

Degree of freedom

F-valet :

Fisher’s value

H g :

Heating value

N :

Speed

NOx :

Nitrogen oxide

Pre-R 2 :

Predicted R2

p-value :

Probability value

PM:

Particular matter

R 2 :

Coefficient of correlation

UHC :

Unburned hydrocarbon

T :

Torque

V :

Volume of fuel

X i :

Levels of the factors

X j :

Levels of the factors

X ME :

Yield of methyl ester

α o :

Coefficient constant

α i :

Linear constant

α ii :

Quadratic constant

α ij :

Interactive effect constant

ε :

Error

ρ :

Density of fuel

ŋ :

Response value

σ 2 :

Residual mean square

ANOVA:

Analysis of variance

ASTM:

American Society for Testing and Materials

BBD:

Box-Behnken design

FFA:

Free fatty acid

FTIR:

Fourier transform infrared spectroscopy

GC-MS:

Gas chromatography–mass spectrometry

RSM:

Response surface methodology

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Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Maryam Helmi, Alireza Hemmati, and Mohammad Amin Sobati. The first draft of the manuscript was written by Maryam Helmi and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Alireza Hemmati.

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The authors declare no competing interests.

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Responsible Editor: Ta Yeong Wu

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Helmi, M., Sobati, M.A. & Hemmati, A. Biodiesel production from Mastic oil via electrolytic transesterification: optimization using response surface methodology and engine test. Environ Sci Pollut Res 30, 104100–104115 (2023). https://doi.org/10.1007/s11356-023-29615-1

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  • DOI: https://doi.org/10.1007/s11356-023-29615-1

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