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离子交换树脂在纺织印染
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添加时间:2004-12-13   作者: www.shuzhi.cn   来源: www.shuzhi.cn   录入:tehua 阅读次数:3714

离子交换树脂的交换能力
ion resin的交换能力是与被交换的阳离子(或阴离子)的价数相浓度有密切关系。

现以阳离子为例说明如下:

(1)价数的关系 在常温下,低浓度水溶液中,交换能力随离子价数增加而增

加,即价数越高的阳离子被交换能力越大。Shuzhi.cn

如铝>钙>钠>氢,即Al+3>Ca+2>Na+>H+

(2)浓度的关系 离子浓度对交换能力也有很大的影响。当水中的阳离子如钙

离子Ca++、镁离子Mg++的浓度相当大时,磺酸型的阳离子交换剂中的氢离子

H+,可和钙、镁离子进行交换,如下式:

2R-SO3H+Ca++→(R-SO3)2Ca+2H+

2R-SO3H+Mg++→(R-SO3)2Mg+2H-

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