| abstract |
An object of the present invention is to provide a method for separating HFC-245cb and (E) -HFO-1234ze by extractive distillation from a composition containing HFC-245cb and (E) -HFO-1234ze having a boiling point as close as 1 ° C. To do. A method for separating HFC-245cb and (E) -HFO-1234ze from a composition containing HFC-245cb and (E) -HFO-1234ze, wherein the composition is halogenated Extractive distillation using at least one extractant selected from the group consisting of hydrocarbons, halogenated unsaturated hydrocarbons, nitriles, ketones, carbonates, alcohols, hydrocarbons, esters and ethers Separation method characterized by. [Selection figure] None |