Azeotropic compositions containing perfluorinated cycloaminoether

A method of removing a contaminant from an article comprising the step of contacting said article with an azeotropic composition to remove the contaminant from the article, wherein the azeotropic composition, when fractionally distilled, produces a distillate fraction which is an azeotrope, and said azeotropic composition consists essentially of:

• (A) perfluorocycloaminoether selected from the group consisting of perfluoro-N-methylmorpholine and perfluoro-N-ethylmorpholine, wherein the amount of said perfluorocycloaminoether in the azeotropic composition is within about 10% of the quantity, by weight, of the perfluorocycloaminoether contained in the azeotropic distillate fraction;
• and
• (B) organic solvent selected from the group consisting of 2,2,4-trimethylpentane and cyclopentane, wherein the amount of said organic solvent in the azeotropic composition is within about 10% of the quantity, by weight, of the organic solvent contained in the azeotropic distillate fraction;
• with the proviso that if the perfluorocycloaminoether is perfluoro-N-methylmorpholine, the organic solvent is either 2,2,4-trimethylpentane or cyclopentane, and if the perfluorocycloaminoether is perfluoro-N-ethylmorpholine, the organic solvent is 2,2,4-trimethylpentene;
• and
• where the azeotropic distillate fraction produced from the azeotropic composition consisting essentially of perfluoro-N-methylmorpholine and 2,2,4-trimethylpentane, contains about 98 weight percent perfluoro-N-methylmorpholin and about 2 weight percent 2,2,4-trimethylpentane and has a boiling point of 51.degree. C. at one atmosphere pressure;
• and
• wherein the azeotropic distillate fraction produced from the azeotropic composition consisting essentially of perfluoro-N-methylmorpholine and cyclopentane contains about 81 weight percent perfluoro-N-methylmorpholine and 19 weight percent cyclopentane and has a boiling point of 36.degree. C. at ambient pressure;
• and
• wherein the azeotropic distillate fraction produced from the azeotropic composition consisting essentially of perfluoro-N-ethylmorpholine and 2,2,4-trimethylpentane contains about 90 weight percent perfluoro-N-ethylmorpholine and about 10 weight percent 2,2,4-trimethylpentane and has a boiling point of 71.degree. C. at one atmosphere pressure.