Process for the purification of 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf)
View Patent ↗The subject of the invention is a process for the purification of 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf). More particularly, it relates to a purification process in which 2,3,3,3-tetrafluoro-1-propene, comprising impurities based on halogen compounds, is brought into contact with an adsorbent, preferably molecular sieves and advantageously molecular sieves having a pore opening with an average diameter between 5 and 11 Å, preferably between 5 and 9 Å.
1. A purification process for purifying 2,3,3,3-tetrafluoropropene comprising contacting 2,3,3,3-tetrafluoropropene having containing saturated halogenated impurities with a molecular sieve having a mean pore diameter of between 5 and 11 Å, whereby said saturated halogenated impurities are separated from said 2,3,3,3-tetrafluoropropene.
2. The purification process as claimed in claim 1 , characterized in that the molecular sieve is of the X or A type.
3. The purification process as claimed in claim 1 , characterized in that the saturated halogenated impurities are selected from the group consisting of 1,1,1,2,3-pentafluoropropane, 1,1,1,2,2-pentafluoropropane, 1,1,1,2,3,3-hexafluoropropane and mixtures thereof.
4. The purification process as claimed in claim 1 , characterized in that the molecular sieve has a mean pore diameter of between 5 and 9 Å.