Method for purifying 1,1,1,2,2-pentafluoropropane and method for preparing 2,3,3,3-tetrafluoro-1-propene
申请人:Arkema France
公开号:US10899690B2
公开(公告)日:2021-01-26
The invention relates to a method for purifying 1,1,1,2,2-pentafluoropropane (245cb) using a first composition comprising 1,1,1,2,2-pentafluoropropane and at least one of the compounds selected from the group consisting of 1,1-difluoroethane (152a), 1,1,1,2-tetrafluoroethane (134a), trans-1,3,3,3-tetrafluoro-1-propene (1234ze-E), cis-1,3,3,3-tetrafluoro-1-propene (1234ze-Z), trans-1,2,3,3,3-pentafluoropropene (1225ye-E), cis-1,2,3,3,3-10 pentafluoropropene (1225ye-Z) and 3,3,3-trifluoropropene (1243zf), said method comprising the steps of: a) bringing said first composition into contact with at least one organic extraction agent in order to form a second composition; b) extractive distillation of said second composition in order to form i) a third composition comprising said organic extraction agent and said at least one of the compounds selected from the group consisting of 1,1-difluoroethane (152a), 1,1,1,2-tetrafluoroethane (134a), trans-1,3,3,3-tetrafluoro-1-propene (1234ze-E), cis-1,3,3,3-tetrafluoro-1-propene (1234ze-Z), trans-1,2,3,3,3-pentafluoropropene (1225ye-E), cis-1,2,3,3,3-pentafluoropropene (1225ye-Z) and 3,3,3-trifluoropropene (1243zf); and ii) a stream comprising the 1,1,1,2,2-pentafluoropropane; and c) recovery and separation of said third composition. The invention also relates to a method for producing 1234yf including the method for purifying 1,1,2,2-pentafluoropropane.
反式-1,3,3,3-四氟-1-丙烯(1234ze-E)、顺式-1,3,3,3-四氟-1-丙烯(1234ze-Z)、反式-1,2,3,3,3-五氟丙烯(1225ye-E)、顺式-1,2,3,3,3-10-五氟丙烯(1225ye-Z)和 3,3,3-三氟丙烯(1243zf),所述方法包括以下步骤:a) 将所述第一种组合物与至少一种有机萃取剂接触,以形成第二种组合物;b) 对所述第二种组合物进行萃取蒸馏,以形成 i) 第三种组合物,该第三种组合物包含所述有机萃取剂和所述至少一种选自以下 组别的化合物:1,1-二氟乙烷 (152a)、1,1,1、2-四氟乙烷 (134a)、反式-1,3,3,3-四氟-1-丙烯 (1234ze-E)、顺式-1,3,3,3-四氟-1-丙烯 (1234ze-Z)、反式-1,2,3,3,3-五氟丙烯 (1225ye-E)、顺式-1,2,3,3,3-五氟丙烯 (1225ye-Z) 和 3,3,3-三氟丙烯 (1243zf);和 ii) 包含 1,1,1,2,2-五氟丙烷的液流;以及 c) 回收和分离所述第三种成分。本发明还涉及一种生产 1234yf 的方法,包括提纯 1,1,2,2-五氟丙烷的方法。