Studies On Reaction Process Majorization For Producing Hexafluoropropylene

The industrial method in the traditional production of hexafluoropropylene (HFP) is to crack tetrafluoroethylene (TFE) at high temperatures in a tubular reactor. But the HFP thus produced is of low selectivity and excessive by-products, and the service life of the cracking tubes is limited to 1-3 months due to the auto-polymerization on the inlet place and carbonation on the outlet place, and disproportionation which produces carbon as well as carbon tetrafluoride if over-stayed at high temperatures which also make reaction temperatures out of control. These are problems to fulfill long-cycle operation without any fault.The paper studies the majorization reaction process to produce HFP through multistage heating-mixing pyrolysis. It has overcome the weaknesses of the one-stage reactor by screening reaction temperatures; hence HFP can be produced in the entire cracking process. Through the running of the unit, the resultshows:The new technique of the multistage heating-mixing pyrolysis to produce HFP may stabilize the cracking process, overcome the temperature runaway of the tubular reactor and prolong the service life of cracking tubes. The screened reaction temperatures promote the production of HFP during the whole cracking process, and raise the production rates by 4-5%. The new technique that can basically eliminate auto-polymerization of TFE in the course of pyrolysis and effectively restrain carbonation on the outlet place extends the continuous...