Green processing using ionic liquids and CO2

Autor:	Dan Hancu, Lynnette A. Blanchard, Eric J. Beckman, Joan F. Brennecke
Rok vydání:	1999
Předmět:	Multidisciplinary Supercritical carbon dioxide Extraction (chemistry) Inorganic chemistry Supercritical fluid extraction chemistry.chemical_element Oxygen law.invention chemistry.chemical_compound chemistry law Carbon dioxide Ionic liquid Thermal stability Distillation
Zdroj:	Nature. 399:28-29
ISSN:	1476-4687 0028-0836
DOI:	10.1038/19887
Popis:	Many organic solvents evaporate into the atmosphere with detrimental effects on the environment and human health. But room-temperature ionic liquids, with low viscosity and no measurable vapour pressure1, can be used as environmentally benign media for a range of industrially important chemical processes2,3,4,5,6, despite uncertainties about thermal stability and sensitivity to oxygen and water. It is difficult to recover products, however, as extraction with water7 works only for hydrophilic products, distillation is not suitable for poorly volatile or thermally labile products, and liquid-liquid extraction using organic solvents results in cross-contamination. We find that non-volatile organic compounds can be extracted from ionic liquids using supercritical carbon dioxide, which is widely used to extract large organic compounds with minimal pollution8. Carbon dioxide dissolves in the liquid to facilitate extraction, but the ionic liquid does not dissolve in carbon dioxide, so pure product can be recovered.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c39fbcdae9c240fc89663c2bcf0866d4 https://doi.org/10.1038/19887 Zobrazit plný text záznamu