Process for producing pentafluoroethane
A technology for pentafluoroethane and monochlorotrifluoroethane is applied in the field of preparation of pentafluoroethane to achieve the effects of cheap and easy-to-obtain raw materials, reduced production cost, high selectivity and yield
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Embodiment 1
[0015] Such as figure 1 As shown, trichlorethylene and hydrogen fluoride are passed as a stream 1 into a fluorination reactor 2, and under the catalysis of a fluorination catalyst, a liquid-phase fluorination reaction is carried out at a temperature of 0-150°C. Catalyst using Sb-Cl x f y (wherein both x and y are positive numbers and the sum of x and y is 5), in the reaction process, the reaction can be guaranteed under the conditions of 0-150 ° C, and the yield and selectivity will increase when the temperature increases. However, the requirements for the reactor are also relatively high. The preferred reaction temperature is 50-150°C. By controlling the reaction time and the molar ratio and total flow of trichlorethylene and hydrogen fluoride in the feed stream 1, the monochlorotrifluoro The overall yield of ethane (HCFC133a) remained at a relatively high level. Chlorine gas can be fed intermittently during the reaction to maintain the activity of the catalyst and the hig...
Embodiment 2
[0019] In this embodiment, it is a continuous reaction process.
[0020] Such as figure 2 As shown, trichlorethylene and hydrogen fluoride are passed as a stream 1 into a fluorination reactor 2, and a liquid-phase fluorination reaction is carried out at a temperature of 0-150° C. under the catalytic action of a fluorination catalyst. The difference from Example 1 is that the reaction product stream 3 of the fluorination reactor 2 first enters the separator 11 for separation, and the separated unreacted raw material stream 11 is recycled back to the reactor 2 for further fluorination, and the stream 12 Together with chlorine, it is sent to chlorination reactor 4 for chlorination to chlorinate monochlorotrifluoroethane (HCFC133a) into dichlorotrifluoroethane (HCFC123a). The reaction product stream 5 is fluorinated with hydrogen fluoride in the fluorination reactor 6. After the fluorination reaction, the stream 7 enters the distillation tower 8 for separation. Fluoroethane (CF...
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