Method for purifying 1,1,1,2,3-pentafluoropropane and use thereof for obtaining high-purity 2,3,3,3-tetrafluoropropene
The present invention relates to a process for purifying 1,1,1,2,3-pentafluoropropane, comprising the steps of: i) providing a composition A1 comprising 1,1,1,2,3-pentafluoropropane and 1,1,1,3-tetrafluoropropane; ii) purifying, preferably distilling, said composition A1 under conditions that are sufficient to form at least two streams including a first stream comprising 1,1,1,2,3-pentafluoropropane and a second stream comprising 1,1,1,3-tetrafluoropropane. The present invention also relates to a process for producing 2,3,3,3-tetrafluoropropene and a composition comprising 2,3,3,3-tetrafluoropropene.
1. A composition comprising:
at least 99.5% by weight of 1,1,1,2,3-pentafluoropropane,
from 1 ppb to 500 ppm of 1,1,1,3-tetrafluoropropane;
less than 1000 ppm of 1,1,1,2,3,3-hexafluoropropane;
from 1 ppb to 50 ppm of 1,1,2-trifluoroethane and/or 1,1,1-trifluoroethane;
less than 100 ppm of 1,1,1,2-tetrafluoropropane;
on the basis of the total weight of the composition.
2. A composition comprising 2,3,3,3-tetrafluoropropene; 3,3,3-trifluoropropene; 1,2,3,3,3-pentafluoropropene; and 1,1,2-trifluoroethane and/or 1,1,1-trifluoroethane, wherein the composition comprises:
at least 99.5% by weight of 2,3,3,3-tetrafluoropropene,
less than 100 ppm of 3,3,3-trifluoropropene,
less than 100 ppm of 1,2,3,3,3-pentafluoropropene,
less than 200 ppm of 1,1,2-trifluoroethane and/or 1,1,1-trifluoroethane, and
less than 20 ppm of 1,1,1,2,3-pentafluoropropane,
on the basis of the total weight of the composition.
3. The composition of claim 1 comprising from 0 ppm to 100 ppm of 1,1,1,2,3,3-hexafluoropropane on the basis of the total weight of the composition.
4. The composition of claim 3 comprising from 0 ppm to 25 ppm of 1,1,1,2,3,3-hexafluoropropane on the basis of the total weight of the composition.
5. The composition of claim 1 comprising from 0 ppm to 10 ppm 1,1,1,3-tetrafluoropropane on the basis of the total weight of the composition.