[CH2:1]=[CH:2][CH2:3][NH2:4].[CH2:5]1[O:7][CH:6]1[CH2:8][Cl:9].Cl.[OH-:11].[Na+].[C:13](=[O:15])=[O:14]>O>[CH2:1]=[CH:2][CH2:3][NH3+:4].[CH2:5]1[O:7][CH:6]1[CH2:8][Cl:9].[C:13]([O-:15])([OH:14])=[O:11].[C:13](=[O:7])([OH:15])[O-:14]1.4 kg of water is loaded into a 2 liter glass reactor. The temperature is set to 35° C. and 100 g of sevelamer hydrochloride is added in portions, stirring the mixture. A solution of 30% sodium hydroxide is then added until pH 12 is reached (around 71 g) and gaseous carbon dioxide is bubbled through. The temperature is maintained at 35-37° C. until pH 7.2 is reached. The mixture is maintained at 35° C. under stirring for 2 hours and if necessary further carbon dioxide is bubbled through until the pH is stabilized at 7.2. The suspension is filtered, the solid washed repeatedly with water to eliminate as much of the residual chlorine as possible. The solid thus obtained is dried and ground.
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