The invention relates to a preparation and refining method for
cefixime, which is conducted as in the following technical steps: the first step,
cefixime methyl triethyl amine salt is dissolved in an
organic solvent, filtered and washed after reaction with
formic acid anhydrous and 98 percent of concentrated
sulfuric acid below 0 DEG C, and dried in vacuum at 50 DEG C to obtain
cefixime monohydrate monosulphate; the second step, the cefixime monohydrate monosulphate is dissolved in deionized water below 0 DEG C, the pH value is adjusted by
ammonia, after being discolored and filtrated by
activated carbon, the filtrate is added with
ethanol and then 4mol / L of
hydrochloride is used for adjusting the pH value, and after filtering, washing by
icing water and
drying at 30 DEG C in vacuum, cefixime trihydrate acid products are obtained. The method has the advantages of simple operation, little
pollution, low manufacturing cost, good quality of prepared cefixime, great convenience for industrialization manufacturing and substantial
economic benefits. Simultaneously, as the product of cefixime is presented as
white powder with content over 98 percent, guarantees are provided for safe medication in the quality of medicines.