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用离子交换膜“Permaplex”,C-20和A-20电渗析法煶纯合氯化钠的9-氨基壬酸,当每100毫升电渗析溶液中合3.5克9-氨基壬酸及1.5克氯化钠时,优惠条件与实验结果如下: 1.中间槽溶液的pH值为7.5—7.8; 2.最大电流密度约为8毫安/厘米~2;电压为65伏; 3.阴极液——氢氧化钠的浓度为0.00135±0.0002N;阳极液——盐酸的浓度为0.0040±0.0002N; 4.电导值为5×10~(-3)欧姆~(-1)厘米~(-1)时,停止电渗析操作。 应用上述条件,用电渗析法除去9-氨基壬酸中氯化钠后,于水中重结晶两次得9-氨 基壬酸纯品,熔点186—189℃,灰分含量不大于0.1％,氯根微量,其收率约93％。
Pure sodium chloride, 9-aminononanoic acid, was electrodialyzed using ion exchange membranes “Permaplex”, C-20 and A-20 and mixed with 3.5 grams of 9-aminononanoic acid and 1.5 grams per 100 milliliters of electrodialysis solution Sodium chloride, the preferential conditions and the experimental results are as follows: 1. The pH of the intermediate tank solution is 7.5-7.8; 2. The maximum current density is about 8 mA / cm2; the voltage is 65 V; 3. The catholyte- - the concentration of sodium hydroxide is 0.00135 ± 0.0002N; the concentration of anolyte-hydrochloric acid is 0.0040 ± 0.0002N; 4. the conductivity is 5 × 10 -3 ohm -1 cm -1; When the electrodialysis operation is stopped. Applying the above conditions, the sodium 9-aminononanoate is removed by electrodialysis, and the product is purified twice by recrystallization from water to obtain pure 9-aminononanoic acid with a melting point of 186-189 DEG C and an ash content of not more than 0.1%. Chloride Trace, the yield of about 93%.