Hoechst Aktiengesellschaft

Joachim Naumann

Konrad Von Werner

Ewald Preisegger

Heiner Debrodt

Wilfried Becker

Walter Muller

Alfons Gisser

Wolfgang Scholten

Martin Schnauber

A mixture of isomers of the formula C.sub.6 F.sup.12, which contains at least 80% by weight of the trans isomer of perfluoro-4-methyl-2-pentene and at most 3% by weight of perfluoro-2-methyl-2-pentene, is suitable as a cooling and insulating medium and can be used as a substitute 1,1,2-trichloro-1,2,2-trifluoroethane.

Perfluoroisohexene as a cooling and insulating medium

The invention relates to a method for testing objects by thermal shock in a closed apparatus, comprising the following, preferably repeated steps:

Method and device for the thermal shock test

Apparatus for cleaning textiles, leather and furs by means of organic solvents as well as for working up the solvent, which comprises a cleaning drum with casing connected to a solvent cycle and a feed-back of solvent vapor including vapor liquefaction. The solvent cycle of the apparatus is provided with a pump, a filter, the cited distillation vessel and a solvent supply vessel containing a cooling cycle. The solvent vapor feed-back of the apparatus is provided with a sieve, a compressor, a condenser, a feed-back to the cited distillation vessel (drum casing) between compressor and condenser, and a duct from the condenser to the solvent supply vessel via a gas expansion device. The vapor feed-back is provided with a heat exchanger being part of the cooling cycle on the secondary side and a subsequent stop valve. The cooling cycle is provided with a compressor with subsequent heat exchanger being part of the feed-back on the primary side and a condensing coil being part of the solvent supply vessel.

Apparatus for cleaning textiles, leather and furs by means of organic

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Kelkheim, Germany

Joachim Naumann