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Greener Isolation of Eugenol from Cloves Using Steam Distillation and Ethyl Acetate

Greener Isolation of Eugenol from Cloves Using Steam Distillation and Ethyl Acetate
Contributors
Assistant Professor of Chemistry and Biochemistry | Villanova University
Harrisburg University of Science and Technology
Associate Professor of Chemistry and Biochemistry, Integrative Science Program Lead (Department Chair) | Harrisburg University of Science and Technology
Learning Objets
Summary
This experiment focuses on the greener extraction of eugenol from cloves using steam distillation and ethyl acetate. By employing steam distillation, we isolate eugenol at lower temperatures, preserving the compound’s integrity while minimizing thermal degradation. Ethyl acetate, a less hazardous solvent compared to dichloromethane (DCM), is used for further extraction to reduce environmental and health risks. However, ethyl acetate’s higher boiling point may result in increased energy consumption during evaporation, highlighting a trade-off between solvent safety and energy efficiency. Overall, the experiment demonstrates the application of green chemistry principles by integrating safer materials and evaluating the energy implications of greener solvent choices.
Digital Object Identifier (DOI)
https://doi.org/10.59877/XFYX4457
Learning Goals/Student Objectives
Objective: The objective of this experiment1 is to extract and isolate eugenol from cloves using steam distillation followed by a greener solvent extraction with ethyl acetate to minimize environmental impact.

Goals:

1. Demonstrate the principles of steam distillation by isolating eugenol from cloves and applying greener techniques to minimize environmental and safety hazards.

2. Introduce students to greener solvent extraction by using ethyl acetate, a less hazardous alternative to the traditional dichloromethane used in the post-distillation extraction of eugenol.
Object Type
Laboratory experiment
Audience
Introductory Undergraduate
Upper/Advanced Undergraduate
Common pedagogies covered
Hands-on learning
Green Chemistry Principles
Waste Prevention
Safer Solvents and Auxiliaries
Design for Energy Efficiency
Design for Degradation
U.N. Sustainable Development Goals (SDGs)
Industry, Innovation and Infrastructure
Responsible Consumption and Production
Safety Precautions, Hazards, and Risk Assessment
Safety Precautions:

• Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety goggles, lab coat, and gloves, to protect against chemical splashes and spills.
• Fume Hood Use: Conduct all procedures involving volatile solvents, such as ethyl acetate, in a properly functioning fume hood to minimize inhalation risks and exposure to fumes.
• Heating Equipment: Handle heating equipment with care. Use proper heating techniques and monitor temperature closely to prevent overheating and potential fires. Avoid direct contact with hot surfaces and materials.
• Proper Disposal: Dispose of chemical waste, including used solvents and plant residues, according to your institution's hazardous waste disposal protocols. Do not dispose of chemicals down the sink or in regular trash.
• Emergency Procedures: Be familiar with the location and proper use of safety equipment such as eyewash stations, safety showers, and fire extinguishers. Know the emergency procedures for chemical spills and exposures.

Hazards:

• Ethyl Acetate: While less hazardous than dichloromethane, ethyl acetate is still flammable and can cause irritation to the eyes, skin, and respiratory system. Prolonged exposure may lead to headaches or dizziness.
• Steam Distillation: The steam distillation process involves hot water and steam, which can cause burns or scalds. Ensure all glassware and apparatus are properly secured and monitored to prevent accidents.
• Anhydrous Sodium Sulfate: This drying agent can be an irritant to the eyes, skin, and respiratory system. Handle with care and avoid inhaling dust.

Risk Assessment:

• Chemical Exposure: Evaluate the risk of exposure to ethyl acetate and other chemicals used in the experiment. Implement controls such as using a fume hood and minimizing direct contact to mitigate risks.
• Energy Use: Assess the risk associated with heating equipment and energy consumption. Ensure proper temperature control and avoid excessive heating to prevent accidents and optimize energy efficiency.
• Waste Management: Properly manage and dispose of all chemical wastes. Minimize waste production and follow green chemistry practices to reduce environmental impact.
• Procedure Monitoring: Continuously monitor the experiment for any signs of malfunction or unexpected reactions. Maintain a clean and organized workspace to reduce the likelihood of accidents.
Teacher Recommendations or Piloting Data (if available)
See "Teaching Notes" section in the file.

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Moderation state
Published
Time required (if applicable)
3 hours