- Method for synthesizing high-purity hexafluoro-1, 3-butadiene
-
The invention relates to a method for synthesizing high-purity hexafluoro-1, 3-butadiene, and belongs to the field of organic chemical synthesis. The method for synthesizing the hexafluoro-1, 3-butadieneI is characterized by comprising: heating hexachlorobenzene, chlorine and anhydrous hydrogen fluoride under the action of a catalyst to generate 1, 2-dichloro-3, 3, 4, 4, 5, 5, 6, 6-octafluorocyclohexene; heating the 1, 2-dichloro-3, 3, 4, 4, 5, 5, 6, 6-octafluorocyclohexene and a solvent under the action of a strong oxidant to generate 1, 6-octafluoroadipic acid; and finally, heating the 1, 6-octafluoroadipic acid and a solvent under the action of sodium hydroxide to generate sodium fluoride, water, carbon dioxide and hexafluoro-1, 3-butadiene, performing water removal and carbon dioxide removal treatment on the mixed gas to obtain the high-purity hexafluoro-1, 3-butadiene. The raw materials are cheap and convenient to obtain; the catalyst has good stability and long service life; theproduct separation and purification are simple; and industrial production is easy.
- -
-
Paragraph 0024; 0027; 0031; 0034; 0038
(2020/05/18)
-
- REACTION OF POLYFLUORINATED CYCLOALKANES WITH VANADIUM, ANTIMONY, AND NIOBIUM PENTAFLUORIDES
-
Polyfluorinated cycloalkanes are fluorinated by vanadium pentafluoride at 25-60 deg C.Conjugation between the C=C bond of the cycloalkene and the aromatic ring facilitates the reaction, whereas the reactivity of the unconjugated olefin fragment is lower than or is equal to that of the aromatic ring.The antimony pentafluoride fluorinates polyhalogenocyclohexenes at 150 deg C, while niobium pentafluoride does not exhibit fluorinating characteristics under these conditions.
- Bardin, V. V.,Avramenko, A. A.,Petrov, V. A.,Krasil'nikov, V. A.,Karelin, A. I.,et al
-
p. 536 - 540
(2007/10/02)
-