Patent ID: 6022842
Filing Date: 2000-02-08
Classification: C11D,C23G

Abstract:
An azeotrope-like composition including perfluorobutyl methyl ether, which ether consists essentially of perfluoro-n-butyl methyl ether, perfluoroisobutyl methyl ether, or mixtures thereof, 1-bromopropane and alcohol wherein the azeotrope-like composition is selected from the group consisting of:(i) compositions consisting essentially of the ether, 1-bromopropane and methanol, which when fractionally distilled, produces a distillate fraction that is an azeotrope consisting essentially of about 73.8 weight percent of the ether, and about 18.6 weight percent of the 1-bromopropane and about 7.6 weight percent of the methanol, the azeotrope boiling at about 44.9.degree. C. at about 746 torr;(ii) compositions consisting essentially of the ether, 1-bromopropane and ethanol which, when fractionally distilled, produce a distillate fraction that is an azeotrope consisting essentially of about 74.8 weight percent of the ether and about 20.2 weight percent of the 1-bromopropane and about 5.0 weight percent of the ethanol, the azeotrope boiling at about 50.4.degree. C. at about 745.3 torr;(iii) compositions consisting essentially of the ether, 1-bromopropane and isopropanol which, when fractionally distilled, produce a distillate fraction that is an azeotrope consisting essentially of about 74.9 weight percent of the ether, about 21.0 weight percent of the 1-bromopropane and about 4.1 weight percent of the isopropanol, the azeotrope boiling at about 51.8.degree. C. at about 738 torr;(iv) compositions consisting essentially of the ether, 1-bromopropane and 1-propanol which, when fractionally distilled, produce a distillate fraction that is an azeotrope consisting essentially of about 76.7 weight percent of the ether, about 21.3 weight percent of the 1-bromopropane and about 2.0 weight percent of the 1-propanol, the azeotrope boiling at about 52.6.degree. C. at about 736 torr;(v) compositions consisting essentially of the ether, 1-bromopropane and 2-butanol which, when fractionally distilled, produce a distillate fraction that is an azeotrope consisting essentially of about 76.8 weight percent of the ether, about 22.0 weight percent of the 1-bromopropane and about 1.2 weight percent of the 2-butanol, the azeotrope boiling at about 53.0.degree. C. at about 736 torr; and(vi) compositions consisting essentially of the ether, 1-bromopropane and t-butanol which, when fractionally distilled, produce a distillate fraction that is an azeotrope consisting essentially of about 74.7 weight percent of the ether, about 22.8 weight percent of the 1-bromopropane and about 2.5 weight percent of the t-butanol, the azeotrope boiling at about 53.1.degree. C. at about 738 torr;wherein the concentrations of the ether, 1-bromopropane and the alcohol in the azeotrope-like composition differ from the concentrations of such components in the corresponding azeotrope by no more than ten percent.