VERFAHREN ZUR GEWINNUNG VON REINEN 2-(PERFLUORALKYL)-AETHANOLEN AUS IHREN GEMISCHEN MIT 2-(PERFLUORALKYL)-AETHYLENEN UND GEGEBENENFALLS 2-(PERFLUORALKYL)- AETHYLESTERN

摘要

2-(perfluoroalkyl)-ethanols of the formula RfCH2CH2OH are obtained from 2-(perfluoroalkyl)-ethyl iodides of the formula RfCH2CH2I as a mixture with 2-(perfluoroalkyl)-ethylenes of the formula RfCH=CH2 and possibly also with 2-(perfluoroalkyl)-ethylcarboxylic acid esters of the formula RfCH2CH2OCOR. From these mixtures, the 2-(perfluoroalkyl)-ethanols are obtained with a high purity degree when adding during the distillation separation as entrainer an alkanol having from 1 to 8 carbon atoms or a monoalkyl ether of ethyleneglycol the alkyl radical of which contains 1 to 4 carbon atoms, or a mixture of such alkanols and/or alkylglycols, and in the presence of 2-(perfluoroalkyl)-ethylcarboxylic acid esters, furthermore an acidic ester interchange catalyst.