Synthesis of perfluoroalkyliodides.

摘要

The invention relates to a continuous process for the preparation of perfluoroalkyl iodides by gas phase thermal telomerisation of tetrafluoroethylene with pentafluoroethyl or heptafluoroisopropyl iodide in a tubular reactor. In order to improve the selectivity for a telomer of the desired degree of polymerisation, telomers of a lower degree of polymerisation are recycled into at least one point of the reactor situated between a twentieth and three-quarters of the length of the tube.