Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane
AssigneeHoechst Aktiengesellschaft
InventorsPeter Hopp, Rolf-Michael Jansen
Life of this patent
Estimating the term…
Abstract
Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane The invention relates to a process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the contaminated R 227 is brought into contact with an alcohol and a base, and the R 227 is simultaneously or subsequently removed by distillation.
Claims17
A process for the removal of olefinic impurities of the formula C.sub.n H.sub.m F.sub.p from wherein n=2-6, m=0-8, p=1-12, and m+p=2n, from 1,1,1,2,3,3,3-heptafluoropropane (R 227) which comprises bringing the contaminated R227 into contact with an alcohol and a base at a temperature of from -20.degree. to 100.degree. C. and at a pressure of from 1 to 50 bar, and simultaneously or subsequently removing the R227 by distillation.
A process for the removal of 1,1,3,3,3-pentafluoropropene or perfluoropropene from 1,1,1,2,3,3,3-heptafluoropropane (R 227) which comprises bringing the contaminated R227 into contact with an alcohol and a base, wherein said base is either NaOH or KOH, at a temperature of from -20.degree. to 100.degree. C. and at a pressure of from 1 to 50 bar, and simultaneously or subsequently removing the R227 by distillation.
A process for the removal of impurities consisting essentially of 1,1,3,3,3-pentafluoropropene or perfluoropropene from 1,1,1,2,3,3,3-heptafluoropropane (R 227) which comprises bringing the R227 contaiminated with 1,1,3,3,3-pentafluoropropene or perfluoropropene into contact with an alcohol and a base, wherein said base is either NaOH or KOH, at a temperature of from -20.degree. to 100.degree. C. and at a pressure of from 1 to 50 bar, and simultaneously or subsequently removing the R227 by distillation.
Dependencies are inferred from the claim text.