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Chemistry

Why Supercritical Carbon Dioxide Is a Green Extraction Solvent

Quick fact

At pressures above 73.8 bar and temperatures above 31°C, carbon dioxide becomes a supercritical fluid that can selectively extract caffeine from coffee beans, and when the pressure is released, it returns to a gas, leaving no solvent residues in the product.

Why this is interesting

Imagine a liquid that can dissolve substances like a solvent, yet flows through materials like a gas—and then disappears without a trace. What if such a solvent were completely non-toxic and recyclable?

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Why Supercritical Carbon Dioxide Is a Green Extraction Solvent

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