Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluoro chloroethane
A technology for chlorodifluoroethane and trifluoroethane, which is applied in the field of preparing halogenated hydrocarbons, can solve the problems of decreased catalyst activity, increased production cost, decreased reaction yield and the like, and achieves the effect of inhibiting the generation of tar-like substances
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Embodiment 1
[0020] Embodiment 1: Preparation of 1.1.1-trifluoroethane (R143a) and 1.1.1-chlorodifluoroethane (R142b) with p-diphenol as additive
[0021] Add 1 gram of p-diphenol and 100 grams of tin tetrachloride to a 2L steel reactor with a reflux tower, then add 500 grams of hydrogen fluoride, and then heat until the inner temperature is 60-65 ° C, starting with 95-100 grams Feed vinylidene chloride at a speed of 60-65 g / h, and simultaneously feed hydrogen fluoride at a speed of 60-65 g / h, draw the reaction product from the top of the reflux tower, the reaction product is a mixture of R143a, R142b and HCl, and maintain the reaction pressure at 13 bar Left and right, the product is regularly detected by gas chromatography after washing with water and alkali. At the end of the reaction, the content of R143a in the product was 58.5%, and the content of R142b was 40.3%.
[0022] When the feeding amount of vinylidene chloride reaches about 2000 grams, stop feeding, and drain the low boilin...
Embodiment 2
[0024] The present embodiment adopts the same operating method and equipment as in Example 1, and the additions and products in the operating process are listed below.
[0025] The additive is 2 gram p-diphenol, the catalyst is 100 gram tin tetrachloride, and the addition of vinylidene chloride is 1953 grams, and the feeding is stopped; the amount of tar produced by adding 100 grams of vinylidene chloride in this embodiment is 0.91 grams.
Embodiment 3
[0027] The present embodiment adopts the same operating method and equipment as in Example 1, and the additions and products in the operating process are listed below.
[0028] The additive is 2 grams of tert-butylphenol, the catalyst is 100 grams of tin tetrachloride, and the addition of vinylidene chloride stops feeding when the amount of vinylidene chloride is 1912 grams; the amount of tar produced by adding 100 grams of vinylidene chloride in this embodiment is 0.92 grams.
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