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.

公开(公告)号：US20220009860A1

公开(公告)日：2022-01-13

申请号：US17293645

申请日：2019-10-10

Applicant: Arkema Inc.

Inventor： Anne M. PIGAMO ,  Jay F. MILLER ,  Emmanuel D. BOUSSAIRE ,  Kevin HISLER

IPC: C07C17/395 ,  C07C17/42

Abstract: Disclosed is a step in the purification process of hydrochlorofluoroolefin refrigerants that are made from processes wherein 1,1,3,3 tetrachloropropene (R1230za) or 1,1,1,3,3-pentachloropropane (R240fa) is reacted with HF in excess. The purification process employs a cold-temperature reaction with a base to remove the HF and any HCl. The process prevents an increase in unwanted organic side-products, particularly trifluoropropyne (TPS), and simultaneously does not reduce the amount of the desired hydrochlorofluoroolefin refrigerant produced. The process also can have an optional step whereby hydrochlorofluoroolefin refrigerant and other organics are removed from aqueous process stream or streams resulting from the reaction with the base. The organics removed can be recycled. This optional step advantageously can increase the yield of the desired refrigerant, while decreasing the environmental load of the plant, by purifying the resulting aqueous process streams.