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螯合树脂D408
D408螯合树脂具有亚胺基二乙酸基螯合基因，对金属离子的选择性类同于EDTA，选择性次序为：
Hg＞Cu＞Pb＞Ni＞Cd＞Zn＞Co＞Mn＞Ca＞Mn＞Ca＞Mg＞Ba＞Sr＞Na
当溶液中共存有一价和二价金属离子时，D408螯合树脂选择性地交换吸附二价金属离子，显示出对二价金属离子的高选择性、高亲和力。同时，被交换吸附的二价金属离子在低PH值的溶液中很容易地解吸，使螯合基因重新恢复交换吸附的功能，正是这种优良的化学特性，赋于D408螯合树脂具有反复应用和广泛的用途。
D408螯合树脂的主要物化性能:
树脂母体： 大孔苯—二乙烯苯共聚球体。
螯合功能基因： 亚胺基二乙酸基｛-CH2N—（CH2NCOONa）2｝
交换容量： （CU2+动态法）≥0.6mmolml-R-Na
稳定性： 对酸碱、溶剂稳定用于精制二次盐水时要求无游离氯。
外观： 浅黄色至灰褐色不透明球状颗粒。
湿视密度： 0.70～0.80g/m
湿真比重:（20℃）： 1.10～1.20
粒径范围： 0.30～1.20mm
粒 径： 0.35～0.55mm
均匀系数： ＜1.7
含水量： 50～62%
PH值： 精制二次盐水9.0±0.5，用于回收金属离子不同而异。
体积变化： 在水中：R-H/R-Na=0.75
膨胀度： ＜25%
出厂型式： Na型
D408 chelating resin with iminodiacetic acid-based chelating gene, the metal ion selectivity similar to EDTA, selective order:
Hg> Cu> Pb> Ni> Cd> Zn> Co> Mn> Ca> Mn> Ca> Mg> Ba> Sr> Na
When the solution of the CPC there are monovalent and divalent metal ions chelate resin selectively D408 divalent metal ion exchange adsorption, showing the high selectivity of the divalent metal ion, a high affinity. At the same time, the divalent metal ion exchange adsorption in the low PH value of the solution easily desorption (regeneration) the chelate gene resume function of the exchange adsorption, excellent chemical properties, confers D408 chelation the resin has repeated applications and a wide range of uses.
D408 chelating resin main physical and chemical properties:
The resin matrix: macroporous styrene - divinylbenzene copolymer sphere.
Chelating functional genes: iminodiacetic acid base {-CH2N-(CH2NCOONa) 2}
Exchange capacity: ≥ the 0.6mmolml-R-Na (Cu2 + dynamic method)
Stability: pH, organic solvent stability requirements for refined secondary brine no free chlorine.
Appearance: light yellow to gray-brown opaque spherical particles.
Wet apparent density: 0.70 to 0.80 g / m
Wet true specific gravity: (20 ° C): 1.10 to 1.20
Particle size range: 0.30 to 1.20mm
The valid particle size: 0.35 to 0.55mm
Uniformity coefficient: <1.7
Moisture content: 50 to 62%
PH: refined secondary brine 9.0 ± 0.5, for the recovery of metal ions varies.
Volume change: in water: R-H/R-Na = 0.75
Degree of swelling: <25%
Factory pattern: Na type
