公开(公告)号：US20220009859A1

公开(公告)日：2022-01-13

申请号：US17293639

申请日：2019-10-10

Applicant: Arkema Inc.

Inventor： Anne M. PIGAMO ,  Kevin HISLER ,  Wayne BROOKS ,  Jay F. MILLER ,  Bertrand Louis Maurice COLLIER ,  Emmanuel D. BOUSSARIE

IPC: C07C17/395 ,  C07C17/383 ,  C07C17/42

Abstract: Disclosed is a method of purifying a stream of crude hydrochlorofluoroolefin refrigerant produced by the reaction of 1,1,3,3 tetrachloropropene (R1230za) or 1,1,1,3,3-pentachloropropane (R240fa) with HF. The process includes a step of removing the cis-(Z) isomer by distillation of the crude refrigerant stream prior to a step of reacting the crude refrigerant stream with a base. The reaction with the base is a necessary step in production of the refrigerant and is done to remove HF and residual HCl from the crude refrigerant stream. Removal of the cis-(Z) isomer before the reaction with the base reduces the amount of toxic flammable trifluoropropyne (TFP) that is produced as a side-reaction during the reaction with the base. In addition, temperature control during the reaction with the base is less critical to minimizing the TFP production if the cis-(Z) isomer is first removed.