反应详情

700 g of N-hydroxymethyl phthalimide, dissolved in 2400 g of dichlorethane, are heated for 5 hours to reflux temperatures with 454 g of acetic acid anhydride. 300 g of a styrene polymer crosslinked with 6 % of divinyl benzene are swollen in this ester solution over a period of 30 minutes at 60° C. 400 g of concentrated sulphuric acid are then added dropwise over a period of 4 hours at reflux temperature. After stirring for 20 hours at the same temperature, the polymer is filtered off under suction and suspended in 2000 ml of 10 % aqueous ammonia solution. The residues of swelling agent are removed from the suspension by azeotropic distillation. The polymer is then heated for 10 hours to 180° C with 40 % sodium hydroxide solution in an autoclave. After the sodium hydroxide has been washed out, 750 ml of a weakly basic anion exchanger are obtained with an acid binding capacity of 3.3 Val/1 for N/10 hydrochloric acid and a nitrogen content of 9.55 % in the dry material.

1. temperatureare heated for 5 hours
2. temperatureat reflux temperature
3. filtrationthe polymer is filtered off under suction
4. customare removed from the suspension by azeotropic distillation
5. temperatureThe polymer is then heated for 10 hours to 180° C with 40 % sodium hydroxide solution in an autoclave
6. washAfter the sodium hydroxide has been washed out