(107b) Guanidine/alcohol and Amidine/alcohol Switchable Solvent Mixtures
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2008
- Proceeding: 2008 Spring Meeting & 4th Global Congress on Process Safety
- Group: AIChE / ACS Jointly Co-sponsored Sessions
- Time: Tuesday, April 8, 2008 - 9:00am-9:25am
Organic solvents are a crucial part of chemistry on both a laboratory and an industrial scale. However, because solvents have very fixed properties, they often need to be removed and replaced between different steps of a reaction. This leads to an increase of economic cost and environmental impact for many processes. Developing a switchable solvent that can reversibly change its nature and properties at mild conditions would help solve this problem. Examples of solvents that consist of either a mixture of an amidine and alcohol or a guanidine and alcohol have been developed that form high polarity ionic liquids when exposed to CO2 at atmospheric pressure. Furthermore, these ionic liquids can be reversed back to a low polarity neutral form by exposure to nitrogen or mild heating. Such liquids have been used as a reaction medium utilizing their ?built-in? facile separation.