Azeotrope-like compositions and their use

A process for removing contaminants from the surface of a substrate comprising the step of contacting the substrate with one or more of the azeotrope-like compositions including (a) perfluorobutyl methyl ether, consisting essentially of perfluoro-n-butyl methyl ether and perfluoroisobutyl methyl ether and mixtures thereof, and (b) organic solvent;

• until the contaminants are dissolved, dispersed or displaced in or by the azeotrope-like composition, and removing the azeotrope-like composition containing the dissolved, dispersed or displaced contaminants from the surface of the substrate,
• which composition is selected from the group consisting of:
• (i) compositions consisting essentially of about 75 to 17 weight percent of the ether and about 25 to 83 weight percent trans-1,2-dichloroethylene that boil at about 39° to 41° C. at about 729 torr;
• (ii) compositions consisting essentially of about 72 to 29 weight percent of the ether and about 28 to 71 weight percent cis-1,2-dichloroethylene that boil at about 51° to 53° C. at about 741 torr;
• (iii) compositions consisting essentially of about 98 to 68 weight percent of the ether and about 2 to 32 weight percent 1,1,2-trichloroethylene that boil at about 57° to 59° C. at about 736 torr;
• (iv) compositions consisting essentially of about 97 to 68 weight percent of the ether and about 3 to 32 weight percent 1-chiorobutane that boil at about 56° to 58° C. at about 728 torr;
• (v) compositions consisting essentially of about 93 to 55 weight percent of the ether and about 7 to 45 weight percent 2-chlorobutane that boil at about 54° to 56° C. at about 737 torr;
• (vi) compositions consisting essentially of about 94 to 62 weight percent of the ether and about 6 to 38 weight percent i-butyl chloride that boil at about 54° to 56° C. at about 730 torr;
• (vii) compositions consisting essentially of about 72 to 13 weight percent of the ether and about 28 to 87 weight percent t-butyl chloride that boil at about 46° to 48° C. at about 733 torr;
• (viii) compositions consisting essentially of about 98 to 82 weight percent of the ether and about 2 to 18 weight percent 1,2-dichloropropane that boil at about 58° to 60° C. at about 724 torr;
• (ix) compositions consisting essentially of about 92 to 57 weight percent of the ether and about 8 to 43 weight percent 2,2-dichloropropane that boil at about 55° to 57° C. at about 735 torr;
• (x) the composition consisting essentially of about 82 to 8 weight percent of the ether and about 18 to 92 weight percent methylene chloride that boil at about 33° to 35° C. at about 737 torr;
• (xi) compositions consisting essentially of about 89 to 50 weight percent of the ether and about 11 to 50 weight percent 1-bromopropane that boil at about 52° to 54° C. at about 729 torr;
• and
• (xii) compositions consisting essentially of about 39 to 10 weight percent of the ether and 61 to 90 weight percent of HCFC-225calcb that boil at about 52° to 54° C. at about 738 torr.
• (xiii) the composition consisting essentially of about 97 to 52 weight percent of the ether and about 3 to 48 weight percent methanol that boils at about 45 to 47° C. at about 733 torr;
• (xiv) the composition consisting essentially of about 97 to 70 weight percent of the ether and about 3 to 30 weight percent ethanol that boils at about 51 to 53° C. at 728 torr;
• (xv) the composition consisting essentially of about 98 to 66 weight percent of the ether and about 2 to 34 weight percent 1-propanol boils at about 56 to 58° C. at about 733 torr;
• (xvi) compositions consisting essentially of about 99 to 75 weight percent of the ether and about 1 to 25 weight percent 2-butanol that boil at about 57 to 59° C. at about 742 torr;
• (xvii) compositions consisting essentially of about 99 to 72 weight percent of the ether and about 1 to 28 weight percent i-butanol that boil at about 57 to 59° C. at about 730 torr;
• (xviii) compositions consisting essentially of about 98 to 78 weight percent of the ether and about 2 to 22 weight percent t-butanol that boil at about 55 to 57° C. at about 739 torr.