Drying gun

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An empty drying pistol to Abderhalden with glass beads and fastening springs
Detail picture of a drying pistol to
Abderhalden with double jacket, solvent flask and desiccant flask with vacuum tap

A drying gun is a device in the chemical laboratory for the intensive drying of small amounts of substances. For this purpose, the substance in a boat or bottle is pushed into a double-walled vessel. Depending on the desired drying temperature, a suitable liquid is refluxed in the vacuum drying apparatus after Abderhalden , the steam flowing through the double jacket, which is at atmospheric pressure. Other systems work with thermostats and suitable thermal fluids or electrical heating. At the same time, the drying agent (e.g. phosphorus pentoxide ) remains in contact with the substance to be dried via the gas phase. If you work without a vacuum , silica gel can also be used. The best possible drying is achieved through the combination of heat, vacuum and desiccant; she is z. B. used to remove traces of water for elemental analyzes.

Scheme of a drying
gun according to Abderhalden: 1 = boiling liquid
2 = container for desiccant
3 = vacuum connection
4 = sample to be dried
5 = reflux condenser

Individual evidence

  1. ^ Walter Wittenberger: Chemische Laboratoriumstechnik , Springer-Verlag, Vienna, New York, 7th edition, 1973, pp. 138-139, ISBN 3-211-81116-8 .