The key to sustainable technology is achieving an economic benefit for environmental improvements. The tunability of benign compounds such as CO 2 and water as supercritical and near-critical fluids offers improved performance and greater flexibility for separation and reaction processes, leading to economic advantages. Examples of such behavior are supercritical CO 2 extractions and separations, CO 2 -expanded polar liquids for separations, and reactions in near-critical water. In each case the tunability is achieved through density changes or cosolvents and may augment product yield, quality, or rates.
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Eckert et al. (2000) studied this question.
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