合成R134和R134a的新工艺

New Technology for Synthesis of R134 and R134a

以一氯二氟甲烷（Ｒ２２）为原料，裂解成含四氟乙烯Ｃ２Ｆ４混合气，以钯为催化剂加氢合成１，１，２，２四氟乙烷（Ｒ１３４），以铬为催化剂经异构化制得１，１，１，２四氟乙烷（Ｒ１３４ａ）。自行设计和制作了中试合成装置，加氢的最佳工艺条件是：反应温度为８０℃，Ｖ（Ｃ２Ｆ４）∶Ｖ（Ｈ２）＝１∶２～１∶４，气体流速２．５０～３．５０ｍ／ｍｉｎ，Ｃ２Ｈ４的转化率为８０％左右；异构化的最佳工艺条件是：温度３００℃，异构化后的混合物中Ｒ１３４ａ的体积分数达７２．６％。

Tetrafluoroethane (R134) is synthesized using Pd as catalyst by hydrogenation of mixed gases,containing tetrafluoroethene (C\-2F\-4),which are obtained by pyrolysis process of chlorodifluoromethane (R22).Then 1,1,1,2tetrafluoroethane (R134a) is prepared using Cr as catalyst by isomerization of R134.A pilot plant is designed and made by ourselves.The optimum technological conditions of hydrogenation for C\-2F\-4 are as follows:reaction temperature is about 80,volume ratio of C\-2F\-4H\-2=1214,flow rate is 2.53.5 m/min.The conversion rate of C\-2F\-4 is about 80%.The optimum temperature for isomerization of R134 is 300,and the content of R134a by volume is 72.6%.\=