Silica → 1,1,1,2,3,4,4,4-Octafluorobut-2-ene

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A 0.3 dm3-capacity tubular reactor made from stainless steel, provided with electric heating, with a thermocouple sheath, with pipes for feeding the starting components and discharging the reaction products, is charged with about 0.23 dm3 of a catalyst which is silicon dioxide promoted with potassium fluoride in an amount of 35 wt. %. The catalyst is heated in a stream of dry nitrogen with a gradual temperature increase from 180 to 350° C. for four hours. Then the temperature is lowered to 240° C., and 40 g of methyl ester of perfluorovaleric acid are fed with the rate of 20 g/hour. The gas mixture outgoing from the reactor is condensed in a trap cooled down to −30° C., and subjected to low-temperature rectification, as a result of which 27.4 g of perfluoro-2-butene are obtained. The yield of the target product is 95.1%.

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