Supercritical CO2

摘要

Neither gas nor liquid but somewhere in between, Supercritical CO2 (scCO2) is widely used in many applications, to dry vegetables, fruits and flowers, extract essential oils or spices. Suppliers for NIKE, Adidas and IKEA use it to dye textiles. Coffee and tea have been decaffeinated with scCO2 since the early 80s. We could use it to dry pulp and paper without the need for heat and steam, and why not dye paper or remove contaminants too, while we're at it?