| 摘要 |
A process for the preparation of anionic exchangers based on crosslinked, water-insoluble organic polymers containing aromatic rings, wherein, in the first step, N-hydroxymethylphthalimide is formed by reacting phthalimide with an aqueous formaldehyde solution in swelling agents in the presence of bases; this N-hydroxymethylphthalimide is, if desired, converted, in a second step, into bis(phthalimidomethyl) ether or an ester of N-hydroxymethylphthalimide; said polymers are amidomethylated using N-hydroxymethylphthalimide, bis(phthalimidomethyl) ether or an ester of N-hydroxymethylphthalimide in the presence of Friedel-Crafts catalysts and swelling agents, and the amidomethylated polymers are subsequently hydrolysed to give the aminomethylated polymers, where, in the first reaction step for the production of the N-hydroxymethylphthalimide, the base used is sodium hydroxide solution, and this sodium hydroxide solution is added in such an amount and at such a rate that the reaction of phthalimide with formaldehyde takes place at a pH in a range from 5 to 6. |
