Question

The comparison of the "greenness" of the two extraction procedures used for extracting essential oil from cloves is not as straightforward as one may initially think. Consider as least three of the 12 green chemistry principles and discuss the positive and negative attributes of steam distillation versus liquid CO2 extraction. Assume the goal is to isolate the essential oil to be used in aromatherapy and that separation of the components is not necessary.

Answer 1

Positive Attribute

Steam Distillation	Liquid CO2 Extraction
(1) Less consuption of energy.	(1) On large scale it can be easily recycled and reuse
(2) Water in steam distillation is not hazardous.	(2) Hazardous solvent wastes are eliminated
(3) Water can be reuse in this process.	(3) It is environament friendly

Negative Attribute

Steam Distillation	Liquid CO2 Extraction
(1)Higher initial cost	(1) Precence of moister hamper the extraction process