Patent ID: 7300743

Claim:
A process for preparing a liquid organic composition characterized by an absorbance/micrometer of <1 at wavelengths from 140 to 260 nm, comprising subjecting to treatment with one or more means for extracting one or more photochemically active species, a liquid compound selected from the group consisting of: i) cyclic, linear, or branched hydrofluorocarbons having 2 to 10 carbon atoms in which there are more fluorines than hydrogen, no runs of adjacent C—H bonds longer than two (CH—CH), no runs of adjacent C—F bonds longer than 6 (CF—CF—CF—CF—CF—CF), and no —CH 2 CH 3 radicals; ii) X—R f a [OR f b ] n OR f c Y wherein X and Y can be hydrogen or fluorine and R f a , R f b , and R f c are 1 to 3 carbon fluorocarbon radicals, linear or branched in which there are more fluorines than hydrogens, no runs of adjacent C—H bonds longer than two are present, no —CH 2 CH 3 radicals are present and no sequences with hydrogen on both sides of an ether oxygen (CH—O—CH) are present; iii) C n F 2n+1 CFHCFHC m F 2m+1 where n equals 1 to 4; and m equals 1 to 4; iv) CF 3 CH 2 CF 2 CH 3 ; v) F[CF(CF 3 )CF 2 O] n CFHCF 3 where n=1 to 5; vi) F[CF(CF 3 )CF 2 O] n CF 2 CF 3 where n=1 to 5; vii) HCF 2 (OCF 2 ) n (OCF 2 CF 2 ) m OCF 2 H where n+m=1 to 8; viii) cyclic, linear, or branched hydrofluorocarbon amines and ether-amines in which there are more fluorines than hydrogens, no runs of hydrogen longer than two (CH—CH), no —CH 2 CH 3 radicals are present and no runs of adjacent C—F bonds longer than 6 (CF—CF—CF—CF—CF—CF), and no C—H bonds immediately adjacent to either nitrogen or oxygen; and, ix) XR f a (OR f b ) w (OR f c ) x (OR f d ) y OR f e Y where X=H or F; R f a and R f e are independently a linear or branched fluoroalkyl radical of 1 to 3 carbons; R f b , R f c , and R f d are linear or branched fluoroalkenyl radicals of 1-3 carbons; and w, x, and y=0 to 10 with the proviso that w+x+y>2; at least until the desired concentration of said one or more photochemically active species is achieved; wherein said one or more photochemically active species comprises moisture and oxygen and the desired concentrations are below 20 parts per million and below 90 parts per million, respectively.