The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2022
Filed:
Oct. 10, 2019
Arkema Inc., King of Prussia, PA (US);
Anne M. Pigamo, Francheville, FR;
Kevin Hisler, Chaponnay, FR;
Wayne Brooks, Paducah, KY (US);
Jay F. Miller, Downingtown, PA (US);
Bertrand Louis Maurice Collier, Montbard, FR;
Emmanuel D. Boussarie, Decines Charpieu, FR;
Arkema Inc., King of Prussia, PA (US);
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.