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Pharmaceutical purification process

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1. IN A PROCESS FOR CONCENTRATING AND PURIFYING ORGANIC COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF ORGANIC COMPOUNDS CONTAINING BASIC NITROGEN-CONTAINING GROUPS WHICH FORM WATER-SOLUBLE SALTS WITH LOW MOLECULAR WEIGHT ACIDS AND HAVE MOLECULAR WEIGHTS IN THE RANGE OF 250 TO 2000 BY ADSORPTION OF THE ORGANIC COMPOUND ON A CARBOXYLIC CATION EXCHANGER FROM AN AQUEOUS SOLUTION THEREOF, THE IMPROVEMENT WHICH COMPRISES ELUTING THE REMAINING INORGANIC CATIONS FROM THE DEPLETED SALT FORM OF THE CARBOXYLIC CATION EXCHANGER, SAID SALT FORM BEING SELECTED FROM THE SODIUM ANND AMMONIUM SALTS OF THE CARBOXYLIC CATION EXCHANGER, ON WHICH THE ORGANIC COMPOUND IS ADSORBED BY TREATTING THE EXCHANGER WITH AN AQUEOUS SOLUTION OF CARBON DIOXIDE, ELUTING THE SUBSTANTIALLY PURE ORGANIC COMPOUND FROM THE CATION EXCHANGER WITH A SOLUTION OF A MINERAL ACID.
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