Azeotrope-like compositions of 1,1,1,2,2,3,3,-heptafluoropentane, C.sub.1 -C.sub.3 alkanol and optionally nitromethane

Reference Number: N 03-04

Inventors: Swan, E. L.; Nalewajek, David; Ellis, L.

Owner: NISTAC

USPTO Link: 5352375

Invention Summary

The present invention comprises azeotrope-like compositions consisting essentially of 1,1,1,2,2,3,3-heptafluoropentane (HFC-467mccfs), C.sub.1 -C.sub.3 alkanol and optionally nitromethane.

For purposes of this invention, C.sub.1 -C.sub.3 alkanol shall mean methanol, ethanol, isopropanol. Methanol and ethanol are the preferred alkanols.

The present azeotrope-like compositions are advantageous for the following reasons. The HFC-467mccfs component does not deplete ozone and has reasonable solvency characteristics. The alkanol components also have good solvent properties dissolving polar contaminants. Nitromethane adds to the hydrolytic stability of the azeotropic blends in the presence of metals. Thus, when these components are combined in effective amounts, a stable, efficient azeotrope-like solvent results.