摘要:
Hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane forms an azeotropic mixture of which molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies, for example, from about 60/40 at a pressure of 1.5 Kg/cm.sup.2 G and a temperature of 20.degree. C. to about 45/55 at a pressure of 15 Kg/cm.sup.2 G and a temperature of 87.degree.C.
摘要:
Hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane forms an azeotropic mixture. A mixture comprising hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane is phase separated when it is cooled to a temperature below 7.degree. C. 1,1,1-Trifluoro-2-chloroethane is purified effectively from the mixture by cooling the mixture to form an upper liquid phase and a lower liquid phase and distilling the lower liquid phase so that the hydrogen fluoride is removed as an azeotropic distillate and 1,1,1-trifluoro-2-chloroethane substantially free from hydrogen fluoride is obtained as a bottom product.
摘要:
Triperfluoroalkylamines of the formula: ##STR1## wherein, Rf.sup.1 and Rf.sup.2 are each a perfluoroalkyl group having 1 to 4 carbon atoms, and Rf.sup.3 is a perfluoroalkyl group having 3 to 11 carbon atoms, have good thermal stability, good voltage resistance, good fluidity at low temperature and low surface energy and which produce no toxic perfluoroisobutene.