METHOD TO PURIFY A CRUDE STREAM CONTAINING HYDROCHLOROFLUOROOLEFI N

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 refrige...

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Main Authors MILLER Jay Fingeret, BOUSSARIE Emmanuel Daniel, BROOKS Wayne, COLLIER Bertrand Louis Maurice, HISLER Kevin, PIGAMO Anne Marie
Format Patent
LanguageEnglish
Spanish
Published 02.07.2021
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Summary: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. Se da a conocer un método de purificación de una corriente de refrigerante hidroclorofluoroolefina en bruto producido mediante la reacción de 1,1,3,3 tetracloropropeno (R1230za) o 1,1,1,3,3-pentacloropropano (R240fa) con HF. El proceso incluye una etapa de eliminar el isómero cis- (Z) mediante destilación de la corriente de refrigerante en bruto antes de una etapa de hacer reaccionar la corriente de refrigerante en bruto con una base. La reacción con la base es una etapa necesaria en la producción del refrigerante y se realiza para eliminar HF y HCl residual de la corriente de refrigerante en bruto. La eliminación del isómero cis- (Z) antes de la reacción con la base reduce la cantidad de trifluoropropino inflamable tóxico (TFP) que se produce como una reacción secundaria durante la reacción con la base. Además, el control de temperatura durante la reacción con la base es menos crítica para minimizar la producción de TFP si el isómero cis- (Z).
Bibliography:Application Number: MX20210005775