Device to Prepare Sodium Chloride of High Reactivity and Surface Area by Vacuum Sublimation

Abstract

This paper describes an apparatus in which sodium chloride can be sublimed in a high vacuum, in amounts in the range 0.1 to 0.5 g, from a quartz tube on to a water‐cooled quartz condenser. Without breaking vacuum, the product can be scraped down into a receiver, transferred to a gas adsorption apparatus for surface area measurement, and introduced into a reaction system. The sublimate has a specific surface most commonly between 20 and 36 m²/g. It exhibits unusually high bulk reactivity for isotopic exchange of anions at room temperature.