5. Extract penicillin from aqueous filtrate into butyl acetate in a centrifugal counter-current extractor (treat/dispose aqueous phase) \
6. Extract penicillin from butyl acetate into aqueous buffer (pH 7.0) in a centrifugal counter-current extractor (recover and recycle butyl acetate) \
7. Acidify the aqueous fraction to pH 2.0-2.5 with H2SO4 and re-
extract penicillin into butyl acetate as in stage 5 \
8. Add potassium acetate to the organic extract in a crystallization tank to crystallize the penicillin as the potassium salt
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