Biodiesel Production from Castor Oil and Engine Performance

Castor oil, derived from Ricinus communis seeds, is distinguished by its high ricinoleic acid content, which imparts unique physicochemical properties suited to biodiesel production. Feedstock preparation typically involves seed drying, dehulling and oil extraction by mechanical or solvent methods. Transesterification of the triglyceride-rich oil with short-chain alcohols, most often methanol, yields fatty acid methyl esters (FAME) and glycerol by-product. Process parameters – catalyst type, alcohol-to-oil ratio, reaction temperature and time – are tuned to maximise conversion efficiency while minimising energy input and wastewater generation. The resulting biodiesel is characterised by fuel properties such as cetane number, kinematic viscosity, flash point and oxidative stability. Engine trials with blends ranging from 5% to pure castor biodiesel reveal that moderate blends (up to 20%) maintain power output and thermal efficiency comparable to conventional diesel, while reducing particulate and hydrocarbon emissions. Pure castor biodiesel, however, may exhibit higher viscosity, poorer cold-flow properties and slightly elevated nitrogen oxide emissions, necessitating optimisation of injection timing and after-treatment controls. Overall, castor biodiesel offers a renewable alternative with potential to enhance rural economies, especially in regions suited to castor cultivation, and to contribute to decarbonisation of the transport sector.

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Biodiesel Production from Castor Oil and Engine Performance publication trend

The graph below shows the total number of articles in biodiesel production from castor oil and engine performance across all publications each year (not limited to Nature Index journals).

Technical terms

Transesterification: Chemical reaction in which triglycerides react with an alcohol to form biodiesel (fatty acid esters) and glycerol.

Ricinoleic acid: A monounsaturated hydroxy fatty acid unique to castor oil, contributing to high viscosity and oxidative stability of the fuel.

Cetane number: Measure of fuel ignition quality; higher values indicate shorter ignition delay in diesel engines.

Oxidative stability: Resistance of biodiesel to degradation by oxygen; critical for storage and engine reliability.

Viscosity: Internal friction of fluid flow; affects atomisation in fuel injectors and combustion efficiency.

References

1. A Novel Microwave Hot Pressing Machine for Production of Fixed Oils from Different Biopolymeric Structured Tissues. Polymers (2023).
2. Castor oil (Ricinus communis): a review on the chemical composition and physicochemical properties. Food Science and Technology (2021).