TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The halogen compound is alkali metal halide or lithium bromide. The solvent is aprotic polar solvent. Preferred Composition: The content of water is 15-100 mole times the content of sulfonic-acid ester group in the polymer having sulfonic-acid ester group. The content of water is 3-30 weight% with respect to the solvent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The polymer having sulfonic-acid group is polymer containing polyarylene. The polymer having sulfonic-acid ester group is polymer having repeating unit of formula (III), repeating unit of formula (IV) or repeating unit of formula (V), and segment of formula: -(((Ar1-Y1)a-Ar2-Z1-((Ar3-Y2-)b-Ar4-Z2)c)n-(Ar1-Y1)a-Ar2)- (VI).R2=H, fluorine, (1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy, 2-20C acyl or cyano), all optionally substituted with fluorine, cyano, 1-20C alkoxy, 6-20C aryl or 6-20C aryloxy, in which two R1 optionally couple to form a ring;A=bivalent electron-withdrawing group;Ar1-Ar4=1-20C alkyl, 1-20C alkoxy and 2-20C acyl, all optionally substituted with fluorine, cyano, 1-20C alkoxy, 6-20C aryl or 6-20C aryloxy, 6-20C aryl optionally substituted with fluorine, cyano, 1-20C alkoxy, 6-10C aryloxy or 6-20C aryloxy optionally substituted with fluorine, cyano, 1-20C alkoxy or 6-20C aryloxy;Y1,Y2=single bond, carbonyl, sulfonyl, isopropylidene, hexafluoro isopropylidene or 9,9-diyl fluorene;Z1,Z2=oxygen or sulfur;a-c=0 or 1;n=5 or more;m=1 or 2;k=4-m;andi=5-m. Preferred Definitions:    R1=2,2-dimethyl propyl.    EXAMPLE - Anhydrous nickel bromide (in g) (0.13), 2,2'-bipyridine (0.11), N,N'-dimethylacetamide (38.08), biphenyl compound of formula (A) and 4.4'-dichloro biphenyl-2,2'-disulfonic-acid di(2,1-dimethyl propyl) were mixed and reacted at 60?oC for 2 hours, to obtain polyarylene containing segment with weight average molecular weight of 279000 and number average molecular weight of 78000. Monohydrate lithium bromide (1.8) and water (2.54) were added to the reaction and stirred at 120?oC for 12 hours, to obtain homogenous solution. The solution was filtered and dried, to deposit a brown solid of polyarylene (1.05) with segment of formula (B).