Azeotropic or quasi-azeotropic composition comprising 1,1,1,2,2-pentafluoropropane and trans-1,3,3,3-tetrafluoropropene

Abstract

The present invention relates to compositions comprising 1,1,1,2,2-pentafluoropropane and trans-1,3,3,3-tetrafluoropropene, which are of use in numerous fields of application.

Claims

1. An azeotropic or quasi-azeotropic composition comprising from 51 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene and from 1 mol % to 49 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition, the said composition having a boiling point of between 50 C. and 0 C.

2. The composition according to claim 1, wherein the composition comprises from 60 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene and from 1 mol % to 40 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition.

3. The composition according to claim 1, wherein the boiling point is between 40 C. and 5 C.

4. The composition according to claim 1, wherein the pressure is between 0.2 and 30 bara.

5. The composition according to claim 1, wherein the composition comprises from 80 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene and from 1 mol % to 20 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition.

6. The composition according to claim 1, wherein the composition is azeotropic.

7. The composition according to claim 1, wherein the composition consists of 1,1,1,2,2-pentafluoropropane and trans-1,3,3,3-tetrafluoropropene.

8. A for the separation of the composition according to claim 1, wherein the process comprises a stage of extractive distillation of the said composition in the presence of an organic solvent, in order to obtain a first stream predominantly comprising 1,1,1,2,2-pentafluoropropane and a second stream predominantly comprising trans-1,3,3,3-tetrafluoropropene.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0013] FIG. 1 represents a graph illustrating the relative volatility of a composition of 1,1,1,2,2-pentafluoropropane and of trans-1,3,3,3-tetrafluoropropene as a function of their respective molar fractions at T=50 C.

[0014] FIG. 2 represents a graph illustrating the relative volatility of a composition of 1,1,1,2,2-pentafluoropropane and of trans-1,3,3,3-tetrafluoropropene as a function of their respective molar fractions at T=30 C.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0015] The expression quasi-azeotropic has a broad meaning and is intended to include compositions which are strictly azeotropic and those which behave like an azeotropic mixture.

[0016] The volatility of a compound A is represented by the ratio of the molar fraction in the gas phase (y.sub.A) to the molar fraction in the liquid phase (x.sub.A) under equilibrium conditions (at pressure and temperature equilibrium): =y.sub.A/x.sub.A. The volatility of a compound B is represented by the ratio of the molar fraction in the gas phase (y.sub.B) to the molar fraction in the liquid phase (x.sub.B) under equilibrium conditions (at pressure and temperature equilibrium): =y.sub.B/x.sub.B. The relative volatility makes it possible to measure the ease of separation of two compounds A and B. It is the ratio of the volatilities of the 2 compounds: .sub.A,B=y.sub.Ax.sub.B=y.sub.B/x.sub.A. The greater the volatility, the more the mixture can be easily separated.

[0017] When the relative volatility is equal to 1 or between 0.95 and 1.05, this means that the mixture is azeotropic. When the relative volatility is between 0.85 and 1.15, this means that the mixture is quasi-azeotropic.

[0018] A subject-matter of the present invention is an azeotropic or quasi-azeotropic composition comprising the compounds 1,1,1,2,2-pentafluoropropane and trans-1,3,3,3-tetrafluoropropene.

[0019] In that which follows, the following compounds represent: [0020] 1,1,1,2,2-pentafluoropropane: HFC-245cb [0021] trans-1,3,3,3-tetrafluoropropene: HFO-1234zeE

[0022] According to a preferred embodiment, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene and from 0.01 mol % to 99.99 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition.

[0023] More preferably, the said composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously the said composition comprises from 0.5 mol % to 99.5 mol % of trans-1,3,3,3-tetrafluoropropene, preferably the said composition comprises from 10 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, more preferably the said composition comprises from 20 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, in particular the said composition comprises from 30 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, more particularly the said composition comprises from 40 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, favourably the said composition comprises from 50 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, more favourably the said composition comprises from 60 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, more favourably still the said composition comprises from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, on the basis of the total amount in moles of the composition.

[0024] Preferably, the said composition comprises from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously the said composition comprises from 0.5 mol % to 99.5 mol % of 1,1,1,2,2-pentafluoropropane, preferably the said composition comprises from 1 mol % to 90 mol % of 1,1,1,2,2-pentafluoropropane, more preferably the said composition comprises from 1 mol % to 80 mol % of 1,1,1,2,2-pentafluoropropane, in particular the said composition comprises from 1 mol % to 70 mol % of 1,1,1,2,2-pentafluoropropane, more particularly the said composition comprises from 1 mol % to 60 mol % of 1,1,1,2,2-pentafluoropropane, favourably the said composition comprises from 1 mol % to 50 mol % of 1,1,1,2,2-pentafluoropropane, more favourably the said composition comprises from 1 mol % to 40 mol % of 1,1,1,2,2-pentafluoropropane, more favourably still the said composition comprises from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, on the basis of the total amount in moles of the composition.

[0025] According to a preferred embodiment, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 0.5 mol % to 99.5 mol %, preferably from 10 mol % to 99 mol %, more preferably from 20 mol % to 99 mol %, in particular from 30 mol % to 99 mol %, more particularly from 40 mol % to 99 mol %, favourably from 50 mol % to 99 mol %, more favourably from 60 mol % to 99 mol %, more favourably still from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene; and from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 0.5 mol % to 99.5 mol %, preferably from 1 mol % to 90 mol %, more preferably from 1 mol % to 80 mol %, in particular from 1 mol % to 70 mol %, more particularly from 1 mol % to 60 mol %, favourably from 1 mol % to 50 mol %, more favourably from 1 mol % to 40 mol %, more favourably still from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition.

[0026] The boiling point of the composition is between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C.

[0027] According to a preferred embodiment, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 0.5 mol % to 99.5 mol %, preferably from 10 mol % to 99 mol %, more preferably from 20 mol % to 99 mol %, in particular from 30 mol % to 99 mol %, more particularly from 40 mol % to 99 mol %, favourably from 50 mol % to 99 mol %, more favourably from 60 mol % to 99 mol %, more favourably still from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene; and from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 0.5 mol % to 99.5 mol %, preferably from 1 mol % to 90 mol %, more preferably from 1 mol % to 80 mol %, in particular from 1 mol % to 70 mol %, more particularly from 1 mol % to 60 mol %, favourably from 1 mol % to 50 mol %, more favourably from 1 mol % to 40 mol %, more favourably still from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition, and the said composition has a boiling point of between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C.

[0028] Preferably, the pressure is between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara.

[0029] Preferably, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 0.5 mol % to 99.5 mol %, preferably from 10 mol % to 99 mol %, more preferably from 20 mol % to 99 mol %, in particular from 30 mol % to 99 mol %, more particularly from 40 mol % to 99 mol %, favourably from 50 mol % to 99 mol %, more favourably from 60 mol % to 99 mol %, more favourably still from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene; and from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 0.5 mol % to 99.5 mol %, preferably from 1 mol % to 90 mol %, more preferably from 1 mol % to 80 mol %, in particular from 1 mol % to 70 mol %, more particularly from 1 mol % to 60 mol %, favourably from 1 mol % to 50 mol %, more favourably from 1 mol % to 40 mol %, more favourably still from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition, and the said composition has a boiling point of between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C., at a pressure of between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara.

[0030] The boiling point can also be between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C.

[0031] Thus, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 0.5 mol % to 99.5 mol %, preferably from 10 mol % to 99 mol %, more preferably from 20 mol % to 99 mol %, in particular from 30 mol % to 99 mol %, more particularly from 40 mol % to 99 mol %, favourably from 50 mol % to 99 mol %, more favourably from 60 mol % to 99 mol %, more favourably still from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene; and from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 0.5 mol % to 99.5 mol %, preferably from 1 mol % to 90 mol %, more preferably from 1 mol % to 80 mol %, in particular from 1 mol % to 70 mol %, more particularly from 1 mol % to 60 mol %, favourably from 1 mol % to 50 mol %, more favourably from 1 mol % to 40 mol %, more favourably still from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition, and the said composition has a boiling point of between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C.

[0032] Preferably, the composition comprises from 0.01 mol % to 99.99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 0.5 mol % to 99.5 mol %, preferably from 10 mol % to 99 mol %, more preferably from 20 mol % to 99 mol %, in particular from 30 mol % to 99 mol %, more particularly from 40 mol % to 99 mol %, favourably from 50 mol % to 99 mol %, more favourably from 60 mol % to 99 mol %, more favourably still from 70 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene; and from 0.01 mol % to 99.9 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 0.5 mol % to 99.5 mol %, preferably from 1 mol % to 90 mol %, more preferably from 1 mol % to 80 mol %, in particular from 1 mol % to 70 mol %, more particularly from 1 mol % to 60 mol %, favourably from 1 mol % to 50 mol %, more favourably from 1 mol % to 40 mol %, more favourably still from 1 mol % to 30 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the composition, and the said composition has a boiling point of between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C., at a pressure of between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara.

[0033] According to a specific embodiment, the composition is azeotropic.

[0034] Preferably, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously the said azeotropic composition can comprise from 82 mol % to 98 mol % of trans-1,3,3,3-tetrafluoropropene, preferably the said azeotropic composition can comprise from 83 mol % to 98 mol % of trans-1,3,3,3-tetrafluoropropene, more preferably the said azeotropic composition can comprise from 84 mol % to 97 mol % of trans-1,3,3,3-tetrafluoropropene, in particular the said azeotropic composition can comprise from 85 mol % to 97 mol % of trans-1,3,3,3-tetrafluoropropene, more particularly the said azeotropic composition can comprise from 86 mol % to 96 mol % of trans-1,3,3,3-tetrafluoropropene, favourably the said azeotropic composition can comprise from 87 mol % to 96 mol % of trans-1,3,3,3-tetrafluoropropene, more favourably the said azeotropic composition can comprise from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene, particularly favourably from 88 mol % to 94 mol % of trans-1,3,3,3-tetrafluoropropene, more particularly favourably from 88 mol % to 93 mol % of trans-1,3,3,3-tetrafluoropropene, on the basis of the total amount in moles of the azeotropic composition.

[0035] Preferably, the said azeotropic composition can comprise from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously the said azeotropic composition can comprise from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably the said azeotropic composition can comprise from 2 mol % to 17 mol % of 1,1,1,2,2-pentafluoropropane, more preferably the said azeotropic composition can comprise from 3 mol % to 16 mol % of 1,1,1,2,2-pentafluoropropane, in particular the said azeotropic composition can comprise from 3 mol % to 15 mol % of 1,1,1,2,2-pentafluoropropane, more particularly the said azeotropic composition can comprise from 4 mol % to 14 mol % of 1,1,1,2,2-pentafluoropropane, favourably the said azeotropic composition can comprise from 4 mol % to 13 mol % of 1,1,1,2,2-pentafluoropropane, more favourably the said azeotropic composition can comprise from 5 mol % to 12 mol % of 1,1,1,2,2-pentafluoropropane, particularly favourably from 6 mol % to 12 mol % of 1,1,1,2,2-pentafluoropropane, more particularly favourably from 7 mol % to 12 mol % of 1,1,1,2,2-pentafluoropropane, on the basis of the total amount in moles of the azeotropic composition.

[0036] In particular, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 82 mol % to 98 mol %, preferably from 83 mol % to 98 mol %, more preferably from 84 mol % to 97 mol %, in particular from 85 mol % to 97 mol %, more particularly from 86 mol % to 96 mol %, favourably from 87 mol % to 96 mol %, more favourably from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene, particularly favourably from 88 mol % to 94 mol % of trans-1,3,3,3-tetrafluoropropene, more particularly favourably from 88 mol % to 93 mol % de trans-1,3,3,3-tetrafluoropropene; and from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably from 2 mol % to 17 mol %, more preferably from 3 mol % to 16 mol %, in particular from 3 mol % to 15 mol %, more particularly from 4 mol % to 14 mol %, favourably from 4 mol % to 13 mol %, more favourably from 5 mol % to 12 mol %, particularly favourably from 6 mol % to 12 mol % of 1,1,1,2,2-pentafluoropropane, more particularly favourably from 7 mol % to 12 mol % of 1,1,1,2,2-pentafluoropropane, based on the total amount in moles of the azeotropic composition.

[0037] The said azeotropic composition can have a boiling point of between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C. The said azeotropic composition can also have a boiling point of between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C., more preferably from 35 C. to 20 C., in particular from 35 C. to 25 C. Alternatively, the said azeotropic composition can have a boiling point of between 40 C. and 60 C., preferably between 45 C. and 55 C.

[0038] Preferably, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 82 mol % to 98 mol %, preferably from 83 mol % to 98 mol %, more preferably from 84 mol % to 97 mol %, in particular from 85 mol % to 97 mol %, more particularly from 86 mol % to 96 mol %, favourably from 87 mol % to 96 mol %, more favourably from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene; and from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably from 2 mol % to 17 mol %, more preferably from 3 mol % to 16 mol %, in particular from 3 mol % to 15 mol %, more particularly from 4 mol % to 14 mol %, favourably from 4 mol % to 13 mol %, more favourably from 5 mol % to 12 mol %, based on the total amount in moles of the azeotropic composition; and the said azeotropic composition has a boiling point of between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C.

[0039] Preferably, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 82 mol % to 98 mol %, preferably from 83 mol % to 98 mol %, more preferably from 84 mol % to 97 mol %, in particular from 85 mol % to 97 mol %, more particularly from 86 mol % to 96 mol %, favourably from 87 mol % to 96 mol %, more favourably from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene; and from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably from 2 mol % to 17 mol %, more preferably from 3 mol % to 16 mol %, in particular from 3 mol % to 15 mol %, more particularly from 4 mol % to 14 mol %, favourably from 4 mol % to 13 mol %, more favourably from 5 mol % to 12 mol %, based on the total amount in moles of the azeotropic composition; and the said azeotropic composition has a boiling point of between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C., more preferably from 35 C. to 20 C., in particular from 35 C. to 25 C. Alternatively, the said azeotropic composition can have a boiling point of between 40 C. and 60 C., preferably between 45 C. and 55 C.

[0040] According to a preferred embodiment, the pressure can be between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara.

[0041] Preferably, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 82 mol % to 98 mol %, preferably from 83 mol % to 98 mol %, more preferably from 84 mol % to 97 mol %, in particular from 85 mol % to 97 mol %, more particularly from 86 mol % to 96 mol %, favourably from 87 mol % to 96 mol %, more favourably from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene; and from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably from 2 mol % to 17 mol %, more preferably from 3 mol % to 16 mol %, in particular from 3 mol % to 15 mol %, more particularly from 4 mol % to 14 mol %, favourably from 4 mol % to 13 mol %, more favourably from 5 mol % to 12 mol %, based on the total amount in moles of the azeotropic composition; and has a boiling point of between 50 C. and 100 C., advantageously between 40 C. and 80 C., preferably between 35 C. and 70 C., in particular between 30 C. and 60 C., more particularly from 30 C. to 20 C., favourably from 30 C. to 10 C., more favourably from 30 C. to 0 C., particularly favourably from 30 C. to 5 C., at a pressure of between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara.

[0042] Preferably, the said azeotropic composition can comprise from 81 mol % to 99 mol % of trans-1,3,3,3-tetrafluoropropene, advantageously from 82 mol % to 98 mol %, preferably from 83 mol % to 98 mol %, more preferably from 84 mol % to 97 mol %, in particular from 85 mol % to 97 mol %, more particularly from 86 mol % to 96 mol %, favourably from 87 mol % to 96 mol %, more favourably from 88 mol % to 95 mol % of trans-1,3,3,3-tetrafluoropropene; and from 1 mol % to 19 mol % of 1,1,1,2,2-pentafluoropropane, advantageously from 2 mol % to 18 mol % of 1,1,1,2,2-pentafluoropropane, preferably from 2 mol % to 17 mol %, more preferably from 3 mol % to 16 mol %, in particular from 3 mol % to 15 mol %, more particularly from 4 mol % to 14 mol %, favourably from 4 mol % to 13 mol %, more favourably from 5 mol % to 12 mol %, based on the total amount in moles of the azeotropic composition; and the said azeotropic composition has a boiling point of between 50 C. and 0 C., advantageously between 40 C. and 5 C., preferably between 35 C. and 10 C., at a pressure of between 0.2 and 30 bara, preferably between 0.3 and 20 bara, in particular between 0.5 and 16 bara, more particularly between 0.6 and 13 bara. In particular, the said azeotropic or quasi-azeotropic composition as described above consists of 1,1,1,2,2-pentafluoropropane and trans-1,3,3,3-tetrafluoropropene.

[0043] The relative volatilities of the compositions according to the present invention are represented in FIGS. 1 and 2. FIG. 1 more particularly illustrates the relative volatility of a composition of 1,1,1,2,2-pentafluoropropane and of trans-1,3,3,3-tetrafluoropropene as a function of their respective molar fractions at a temperature of 50 C. FIG. 2 more particularly illustrates the relative volatility of a composition of 1,1,1,2,2-pentafluoropropane and of trans-1,3,3,3-tetrafluoropropene as a function of their respective molar fractions at 30 C.

[0044] According to another aspect of the present invention, a process for the separation of 1,1,1,2,2-pentafluoropropane and of trans-1,3,3,3-tetrafluoropropene is provided. The said process comprises a stage of extractive distillation of an azeotropic or quasi-azeotropic composition as described above in the presence of an organic solvent in order to obtain a first stream predominantly or essentially comprising 1,1,1,2,2-pentafluoropropane and a second stream predominantly or essentially comprising trans-1,3,3,3-tetrafluoropropene.

[0045] Preferably, the process for the separation of any one of the compositions described above comprises a stage of extractive distillation of the said composition in the presence of an organic solvent, in order to obtain a first stream predominantly comprising 1,1,1,2,2-pentafluoropropane and a second stream predominantly comprising trans-1,3,3,3-tetrafluoropropene; preferably, the organic solvent is present in the second stream; in particular, the organic solvent is selected from the group consisting of ethylamine, isopropylamine, n-propylamine, diethylamine, propanone, tetrahydrofuran, ethyl acetate, butanone, 3-pentylamine, 2-methoxyethanamine, 1,4-dioxane, 3-pentanone, 2-pentanone, n-pentylamine, 1,3-dioxane, 1,2-diaminoethane, 1,2-propanediamine, 2-methoxyethanol, n-butyl acetate and 1-ethoxy-2-propanol.