申请人:——
公开号:US20020177742A1
公开(公告)日:2002-11-28
The present invention relates to a process for producing fluorinated aliphatic compounds by pyrolysis of perfluorocarboxylic acids and their derivatives—halides and esters. The pyrolysis is carried out in the presence of a catalyst consisting of a carrier most preferably selected from the series comprising active carbon, magnesium oxide, calcium oxide, barium oxide, zinc oxide, aluminum oxide, nickel oxide, oxides of silicon promoted with alkali metal halides, selected from the series comprising fluorides, chlorides bromides, iodides of sodium, potassium, rubidium, cesium, at a temperature in the range of from about 100° C. to about 450° C.; with producing fluorinated aliphatic compounds selected from the series comprising perfluoroolefins, polyfluoroolefins and their derivatives; and also in the presence additionally of hydrogen fluoride with the formation of fluorinated aliphatic compounds selected from the series comprising polyfluoroalkanes and their derivatives.
本发明涉及一种通过对全氟羧酸及其衍生物(卤化物和酯类)进行热解制备氟代脂肪化合物的过程。在催化剂的存在下进行热解,该催化剂由载体组成,最好选择活性炭、氧化镁、氧化钙、氧化钡、氧化锌、氧化铝、氧化镍、硅氧化物(促进碱金属卤化物选择自钠、钾、铷、铯的氟化物、氯化物、溴化物、碘化物系列)中最好的一种。在温度范围约为100℃至450℃的条件下进行,生产出选择自全氟烯烃、多氟烯烃及其衍生物的氟代脂肪化合物;此外,还在氢氟酸的存在下形成选择自多氟烷和其衍生物的氟代脂肪化合物。