Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO1999000344 - PROCEDE POUR PREPARER DES HYDROFLUOROCARBURES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

WHAT IS CLAIMED IS

1. A process for producing a hydrofluorocarbon (HFC) comprising the steps of:

providing reactor means for conducting a fluorination reaction wherein at least a portion of said reaction means is lined with a fluoropolymer;

adding a chlorinated organic compound in liquid phase and a fluorination
agent to said reactor; and

reacting at least a portion of said chlorinated organic compound with at
least a portion of said fluorination agent to produce said HFC.

2. The process of claim 1, wherein said fluorination agent is hydrogen fluoride, and said chlorinated organic compound has the formula Cal ^Cl-Fy, where l <n<7, 0<m< 16, l <x< 16, 0<y< 16, and (m+x-r-y) < (2n+2), and wherein a stoichiometric excess of said HF is maintained.

3. The process of claim 2, wherein 3 <n<5.

4. The process of claim 1, wherein said reactor means comprises a reactor having a loose, fluoropolymer liner.

5. The process of claim 1, wherein said fluoropolymer is selected from the group consisting of polytetrafluoroethylene, poly(vinylidene fluoride), ethylene-tetrafluoroethylene polymer, ethylene-hexafluoropropylene polymer,
tetrafluoroethylene-hexafluoropropylene polymer, any modified version thereof, and blends of two or more thereof.

6. The process of claim 1, wherein said fluorinating agent is superheated and said chlorinated organic compound is preheated prior to adding to the reactor.

7. A process for producing a hydrofluorocarbon (HFC) comprising the steps of:

providing a reactor having at least one weep hole and a fluoropolymer
liner; and

reacting at least a portion of a chlorinated organic compound with at least a portion of a fluorination agent in said reactor to produce said HFC.

8. The process of claim 7, wherein said fluoropolymer liner is a loose, fluoropolymer liner comprised of a material selected from the group consisting of polytetrafluoroethylene, poly(vinylidene fluoride), ethylene-tetrafluoroethylene polymer, ethylene-hexafluoropropylene polymer, tetrafluoroethylene-hexafluoropropylene polymer, any modified version thereof, and blends of two or more thereof.

9. A process for producing a hydrofluorocarbon (HFC) comprising the steps of:

providing a reactor with a loose, fluoropolymer liner; and

reacting at least a portion of a chlorinated organic compound with at least a portion of a fluorination agent in said reactor to produce said HFC.

10. The process of claim 9, wherein said fluoropolymer is selected from the group consisting of polytetrafluoroethylene, poly(vinylidene fluoride), ethylene-tetrafluoroethylene polymer, ethylene-hexafluoropropylene polymer, "y WU44 PCT/US98/129S1

tetrafluoroethylene-hexafluoropropylene polymer, any modified version thereof, and blends of two or more thereof.

11. The process of claim 10, wherein said fluoropolymer is
polytetrafluoroethylene or its modified version.

12. The process of claim 9, wherein said chlorinated organic compound has the formula C.H.CLFy, where l ≤n<7, 0≤m< 16, l ≤x< 16, 0<y≤ 16, and
(m+x+y) ≤(2n+2), and wherein a stoichiometric excess of said HF is maintained in said reactor.

13. The process of claim 9, wherein said reactor has a physical size of at least 1000 gallons.

14. A process for extending the useful life of a reactor in a method for producing a hydrofluorocarbon (HFC), said method comprising the step of:

performing a fluorination reaction by reacting a chlorinated organic
compound and a fluorination agent in the presence of a fluorination
catalyst;

said process comprising:

using a reactor with a loose, fluoropolymer liner to perform said
fluorination reaction.

15. The process of claim 14, wherein the corrosion rate of said reactor is less than about 10 mils per year based upon about 8,000 h/yr operation.

16. The process of claim 14, wherein said fluorination reaction further comprises:

charging said reactor with a liquid phase catalyst selected from the group
consisting of halides of Sb, Ta, Sn, Nb, Ti, and Mo, and
combinations of two or more thereof;

feeding said reactor with a chlorinated organic compound in liquid state and hydrogen fluoride (HF), wherein said chlorinated organic compound has the formula C.H.C F,, where l <n≤5, 0≤m≤ 12, l ≤x≤ 12, 0<y≤ 12, and (m+x+y) <(2n+2), and wherein a stoichiometric
excess of HF is maintained; and

heating said reactor between about 30 °C and about 200°C;

pressurizing said reactor between about 30 psig and about 300 psig; and

recovering said HFC from said reactor using a catalyst stripper.

17. The process of Claim 16, wherein said reactor has at least one weep hole.

18. The process of Claim 17, wherein said fluorination reaction further comprises:

adding chlorine to said reactor to regenerate said catalyst.

19. The process of Claim 18, wherein the mole ratio of HF to chlorinated organic compound is about 30:1 to about 1:1.

20. The process of claim 19, wherein said fluoropolymer is selected from the group consisting of polytetrafluoroethylene, poly(vinylidene fluoride), ethylene-tetrafluoroethylene polymer, ethylene-hexafluoropropylene polymer, tetrafluoroethylene-hexafluoropropylene polymer, any modified version thereof, and blends of two or more thereof.