Azeotropic or azeotrope-like composition, and 2,3,3,3 method for producing tetrafluoropropene or hexafluoropropene

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently separating 2,3,3,3-tetrafluoro propene (HFO-1234yf) and hexafluoropropene (HFP) from a mixture containing HFO-1234yf and HFP.;SOLUTION: An azeotrope-like composition consisting of 8.7-76.9 mol% of HFO-1234yf and 23.1-91.3 mol% of HFP is provided. A method for producing HFO-1234yf includes a process of distilling an initial mixture, which includes HFO-1234yf and HFP and has an HFO-1234yf content of 25.9 mol% relative to the total content of HFO-1234yf and HFP, to separate the initial mixture into a first fraction, wherein a content of HFO-1234yf to the total content of HFO-1234yf and HFP is lower than that in the initial mixture, and a second fraction, wherein a content of HFO-1234yf to the total content of HFO-1234yf and HFP is higher than that in the initial mixture, and obtaining HFO-1234yf with a concentration of HFP lowered from the second fraction.;COPYRIGHT: (C)2014,JPO&INPIT