公开(公告)号：US5382724A

公开(公告)日：1995-01-17

申请号：US216780

申请日：1994-03-23

申请人： Hiromoto Ohno ,  Tatsuharu Arai ,  Koichi Katamura ,  Sadayoshi Yuge ,  Haruyuki Kawai ,  Yasuaki Morito

发明人： Hiromoto Ohno ,  Tatsuharu Arai ,  Koichi Katamura ,  Sadayoshi Yuge ,  Haruyuki Kawai ,  Yasuaki Morito

IPC分类号： C07C19/08 ,  C01B7/19 ,  C07C17/38

CPC分类号： C01B7/196 ,  C07C17/38 ,  C07C17/389 ,  Y02P20/582

摘要： A process for purifying 1,1,1,2-tetrafluoroethane which comprises allowing an HF-containing 1,1,1,2-tetrafluoroethane-concentrated fraction to contact at a low temperature with hydrofluoric acid which is an extraction solvent and has an HF concentration equal to or higher than an HF concentration at a water-HF azeotropic point, thereby effecting two-phase separation, and subsequently recovering 1,1,1,2-tetrafluoroethane from the separated lower phase, wherein hydrofluoric acid to be used as the extraction solvent has a concentration of from 38 to 70% by weight, and the extraction and two-phase separation steps are effected at a temperature of from -35.degree. to 35.degree. C. According to the purification process, HF can be recovered economically from a 1,1,1,2-tetrafluoroethane fraction containing a small amount of HF.

摘要翻译： 一种净化1,1,1,2-四氟乙烷的方法，其包括使含HF的1,1,1,2-四氟乙烷浓缩的级分与氢氟酸（其是提取溶剂）在低温下接触并具有HF 浓度等于或高于水-HF共沸点处的HF浓度，从而进行两相分离，随后从分离的下相回收1,1,1,2-四氟乙烷，其中使用氢氟酸作为 提取溶剂的浓度为38〜70重量％，提取和两相分离步骤在-35〜35℃的温度下进行。根据纯化方法，可以经济回收HF 含有少量HF的1,1,1,2-四氟乙烷馏分。