Accession Number:

ADA379234

Title:

Studies of Latent Acidity and Neutral Buffered Chloroaluminate Ionic Liquids

Descriptive Note:

Final rept. 1 Mar 1996-31 Oct 1999

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH

Personal Author(s):

• Osteryoung, Robert A.

Report Date:

2000-03-31

Pagination or Media Count:

28.0

Abstract:

Studies on ionic liquids composed of aluminum chloride and 1-ethyl-3-methylimidazolium chloride were carried out, with emphasis on understanding and explaining acidity and latent acidity in neutral buffered melts. It was found that alkaline earth, as well as alkali metal salts, function as buffering agents, with both showing the latent acidity effect. Both Bronsted and Lewis acidities were investigated in an effort to understand the role of the type and concentration of the buffering alkali or alkaline earth salt. A silversilver chloridechloride ion electrode was found to function as a reversible chloride ion indicator over a very narrow range of melt acidity about the neutral point. This electrode, and relative solubility product measurements, were employed in these studies. It was found that the latent acidity could be explained in terms of the solubility product relationship of the buffering salt, with the salt having the smallest solubility product creating the most acidic melt. Some work was also carried out on non-haloaluminate melts.

Descriptors:

• *BUFFERS
• *BIBLIOGRAPHIES
• *SALTS
• *ACIDS
• *CHLORINE COMPOUNDS
• IONS
• ALUMINUM COMPOUNDS
• MELTS
• SOLUBILITY
• ALKALINE EARTH COMPOUNDS
• PH FACTOR
• ALKALI METALS

Subject Categories:

• Information Science
• Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE