filtering the solid obtained in step g followed by washing with a nonpolar organic solvent organic solvent or hydrocarbon solvent and i drying the anhydrous crystalline form x of 4 4 4 hydroxydiphenylmethyl 1 piperidinyl 1 hydroxybutyl u03b1 u03b1 dimethylbenzene acetic acid hydrochloride at 70 100 u00b0 c the crude fexofenadine may be recrystallized in a c 1 c 3 alkanol such as methanol ethanol or isopropanol preferably methanol the non polar organic solvents referred to herein are selected from xylene or toluene or a c 6 c 9 alkyl such as n hexane hexane heptane octane nonane or cyclohexane mixtures of solvents maybe used thereof toluene is the preferred solvent the organic solvents are c 1 c 4 alkyl acetates and are selected from methyl ethyl propyl and butyl acetate preferably ethyl acetate the suitable solvent containing hydrogen chloride referred to herein is selected from methanol ethanol isopropanol or t butanol preferably isopropanol the ratio of crude fexofenadine to the c 1 c 3 alkanol is 1 10 20 the ratio of fexofenadine to the solvents in step b is 1 10 15 the hydrocarbon solvent is selected from hexane or cyclohexane preferably cyclohexane the form x of fexofenadine hydrochloride obtained by the processes described above can be identified by a visual melting point capillary tube in the range of about 180 188 u00b0 c a melting endotherm at about.