Journal
CHEMENGINEERING
Volume 3, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/chemengineering3020042
Keywords
ionic liquids; vapor pressure; thermogravimetric analysis; deep eutectic solvents
Categories
Funding
- University of Missouri
- Research Corporation for Science Advancement
Ask authors/readers for more resources
One of the hallmarks of ionic liquids (ILs) and a critical part of their sustainable implementation is their low volatility, although statements in this regard are frequently made in the absence of a critical evaluation. Although it is generally accepted that conventional ILs exhibit significantly reduced vapor pressures relative to common organic solvents, glib statements about ILs having zero volatility can no longer be abided, even if a concrete temperature-dependent vapor pressure, P-vap(T), framework for placement of IL performance has not yet been established. In this communication, P-vap(T) values of 30 illustrative low-volatility fluids-including representative imidazolium-, ammonium-, and pyrrolidinium-based aprotic ILs; examples of protic, polymeric, and di-cationic ILs; as well as deep eutectic solvents (DESs) and glycols-were determined using a simple, convenient, and reproducible isothermal thermogravimetric method. Guided by this vapor pressure map, observed trends can be discussed in terms of anion basicity, cation geometry, alkane chain length, hydrogen bonding strength, and van der Waals forces, providing a context for the placement of theoretical and experimental vapor pressures gleaned in future IL and DES studies.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available