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ChemicalBook CAS DataBase List Pentafluoroethane

Pentafluoroethane synthesis

15synthesis methods
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Yield:354-33-6 76.2 %Chromat. ,354-25-6 0.2 %Chromat. ,306-83-2 9.2 %Chromat. ,75-88-7 0.4 %Chromat. ,374-07-2 0.4 %Chromat. ,76-13-1 0.1 %Chromat.

Reaction Conditions:

with hydrogen fluoride;cobalt-substituted chromium oxide (Cr/Co 99/1, 12-20 mesh, (1.68 to 0.84 mm) ), prepared from chromium (III) nitrate, cobalt (II) nitrate, ammonia (400°C) at 200 - 425; for 9.33333 h;

Steps:

4 EXAMPLE 4
Cobalt-substituted chromium oxide (Cr/Co 99/1,5. 96g, 4 mL, 12-20 mesh, (1.68 to 0.84 mm) ), prepared as described in PREPARATION EXAMPLE 2 was placed in a 1/2" (1.27 cm) diameter [INCONEL NICKEL ALLOY] reactor tube heated in a furnace. The catalyst was heated from [200°C] to [400°C] in a flow of nitrogen (50 cc/min, 8. [3X10-7] [M3/S)] over the course of about 25 minutes, and then the temperature was lowered to [300°C] while maintaining the nitrogen flow for an additional 80 minutes. The flow of nitrogen was reduced to 35 cc/min (5. [8X10-7 M3/S)] and HF was then admitted to the reactor at a flow rate of 12 cc/min (2. [0X10-7] [M3/S).] After 35 minutes, the temperature was raised to [325°C.] After 60 minutes it was raised to [350°C.] After 60 minutes it was raised to [375°C.] After 90 minutes it was raised to [400°C.] After 30 minutes it was raised to [425°C.] After 20 minutes, the flow of nitrogen was reduced to 15 cc/min (2. [5X10-7] [M3/S)] and the flow of HF was increased to 28 cc/min (4. [7X10-7 M3/S).] After 20 minutes, the flow of nitrogen was reduced to 5 cc/min (8. [3X10-3 M3/S)] and the flow of HF was increased to 36 cc/min (6. [0X10-7] [M3/S).] After 20 minutes, the flow of nitrogen was shut off and the flow of HF was increased to 40 cc/min (6. [7X10-7 M3/S),] and this condition was maintained for 120 minutes. The reactor temperature was adjusted to [350°C] and HF and [HCFC-124] vapor were fed to the reactor in molar ratio of 2: 1 at a contact time of 3.3 seconds. The GC-MS analysis of the reactor effluent is given below. Component Mole % HFC-125 76.2 [CFC-115] 1400 ppm HCFC-124 13.5 HCFC-124a 0. [2] [HCFC-133A] 0.4 [CFC-114A] 0.2 HCFC-123 9.2 [CFC-113] 0.1

References:

E.I. DU PONT DE NEMOURS AND COMPANY;Nappa, Mario, J. WO2004/18396, 2004, A1 Location in patent:Page 15

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