[CH2:1]=[CH:2][CH2:3][NH2:4].[CH2:5]1[O:7][CH:6]1[CH2:8][Cl:9].Cl.[C:11](=[O:14])([OH:13])[O-:12].[Na+]>O>[CH2:1]=[CH:2][CH2:3][NH3+:4].[CH2:5]1[O:7][CH:6]1[CH2:8][Cl:9].[C:11]([O-:14])([OH:13])=[O:12]Sevelamer hydrochloride (1.1 Kg) was added into 15.5 L solution of sodium bicarbonate (1.1 Kg NaHCO3 in 14.3 L water). The obtained mixture was stirred at 60-65° C. for 4 hrs. The obtained material was filtered by centrifuge filter. The obtained wet cake was added into 15.5 L solution of sodium bicarbonate (1.1 Kg NaHCO3 in 14.3 L water) and stirring was maintained at 60-65° C. for 4 hrs. The material was filtered by centrifuge filter assembly and obtained wet cake was stirred in 11 L water for 1 hr at 60-65° C. The material was filtered by centrifuge filter. The washings of the wet cake with water were repeated thrice at 60-65° C. The obtained wet cake was dried in air tray dryer (ATD) at about 90-100° C. for 30-36 hrs and LOD was checked after every five hours till LOD was in the range of 5 to 10% to get Sevelamer carbonate (0.995 Kg).
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