Method of obtaining a combination of Z and E stereoisomers of hydrofluoroolefins

摘要

Disclosed are the combinations containing Z and E stereoisomers of hydrofluoroolefins where the more toxic isomer is less than about 30% weight of the combination (vs the sum of Z+E), to minimize the toxicity impact in the applications they will be used for such as cooling and heat fluids, foams blowing agents or solvents. Also disclosed are means to obtain combinations containing Z and E stereoisomers of hydrofluoroolefins.

主权项

1. A method of preparing a combination of Z and E isomers of a hydrofluoroolefin comprising from a trace up to about 30% by weight of the E isomer from a combination having more than about 30% by weight of the E isomer comprising reactive distillation of a combination of Z and E isomers of a hydrofluoroolefin having more than about 30% by weight of the E isomer followed by distillation.