Synthesis of Fatty Acid Methyl Ester from Croton macrostachyus (Bisana) Kernel Oil: Parameter Optimization, Engine Performance, and Emission Characteristics for Croton macrostachyus Kernel Oil Fatty Acid Methyl Ester Blend with Mineral Diesel Fuel

Abstract

Utilization of agricultural waste such as nonedible seed oil for the synthesis of biodiesel via catalytic transesterification is one of the effective ways for the partial replacement of petroleum-based fuels in the area of renewable energy development and is beneficial to CO, CO 2 , and unburned hydrocarbon (HC) emission reduction to the environment. In this regard, the current study investigates the synthesis of fatty acid methyl esters (FAMEs) from Croton macrostachyus kernel oil by considering parameter interaction and optimization to maximize the yield of fatty acid methyl esters (FAMEs). The response surface methodology–central composite design (RSM-CCD) was applied to optimize the C. macrostachyus fatty acid methyl ester (CMKO-FAME) synthesis process by varying the process parameters such as reaction time (1–2 h), molar ratio (6:1–12:1), and catalyst loading (1–2 wt %). The optimum conditions for the transesterification of C. macrostachyus kernel oil (CMKO) were found to be a methanol to oil ratio of 11.98:1, catalyst loading of 1.03 wt %, and reaction time of 2 h, resulting in the conversion of 95.03 wt % C. macrostachyus kernel oil into its mono FAMEs. The fuel properties of CMKO and its FAMEs were determined based on ASTM D6751 and EN 14214 standards. Further, the CMKO and its FAMEs were characterized using Fourier transform infrared (FT-IR), gas chromatography–mass spectrometry (GC–MS), and nuclear magnetic resonance spectroscopy (NMR). The fatty acid composition of CMKO was myristic acid (1.36%), palmitic acid (11.35%), stearic acid (5.11%), oleic acid (18.64%), gadoleic acid (0.34%), linoleic acid (49.084%), and linolenic acid (14.1%). The purity of the produced methyl esters was determined by 1 H NMR and found to be 95.52%, which was quite in good agreement with the experimentally observed yield of 95.39 wt %. The produced CMKO-FAME was blended with diesel fuel at various ratios (B5, B10, B15, and B20) to evaluate the engine performance and emission characteristics in a diesel engine. The engine brake thermal efficiency is lower, the brake-specific fuel consumption (BSFC) using CMKO-FAME blends is higher, and the temperature of exhaust gas emitted after combustion also increased as compared to diesel fuel. Similarly, using produced FAME blends, the emission emitted such as HC, NOx, and CO is reduced. However, the engine fueled with the produced FAME blends increased the level of CO 2 into the atmosphere when compared to diesel fuel. The performance and emission characteristics of diesel engine result show that the blend of CMKO-FAME and diesel can be used as a fuel in a diesel engine without any modification of the engine.

Optimization of biodiesel production from rice bran oil by ultrasound and infrared radiation using ANN-GWO

“…Intense absorption peak at 2923 cm − 1 is attributed to the strongest carbonyl group's stretching (CH stretch), and absorption peak at 1742 cm − 1 corresponds to the stretching of CO double bond [49]. Meanwhile, absoption peak at 1436 cm − 1 is related to -CH 3 asymmetric stretch, while the peak at 1196 cm − 1 corresponds to C-O-C asymmetric stretch [50]. Furthermore, the peak at 1,361 cm − 1 in the FTIR spectrum is in line with O-CH 3 in glycerol that indicate the presence of the residual of the transesterification process.…”

Alternative Methods for Biodiesel Cetane Number Valuation: A Technical Note

“…Based on the saponification and iodine values, the cetane number of biodiesel was then predicted with eq . ,,, For example, biodiesel derived from waste cooking oil, castor bean, Croton macrostachyus (Bisana) kernel oil, and Aegle Marmelos Correa shows cetane numbers of 57.11, 51.48, 50.78, and 58, respectively, which are acceptable and meet the ASTM D6751 specification. , CN = 46.3 + 5458 SV − 0.225 normalIV Where CN is the cetane number; IV is the iodine value; and SV is the saponification value.…”