离子交换树脂交换能力依其交换能力特征可分:
The exchange capacity of ion-exchange resin can be divided according to the characteristics of its exchange capacity:
1. 强碱型阴离子交换树脂:主要是含有较强的反应基如具有四面体铵盐官能基之-N+(CH3)3,在氢氧形式下,-N+(CH3)3OH-中的氢氧离子可以迅速释出,以进行交换,强碱型阴离子交换树脂可以和所有的阴离子进行交换去除。
1. strong anion exchange resin: mainly containing reaction based
strong functional groups such as ammonium salt with tetrahedral N+ (CH3)
3, in the form of hydrogen and oxygen, N+ (CH3) 3OH- hydroxide ion can
be quickly released, in exchange, the exchange of strong anion exchange
resin can remove all anions and.
这类树脂含有强碱性基团,如季铵基(亦称四级胺基)-NR3OH(R为碳氢基团),能在水中离解出OH-而呈强碱性。这种树脂的正电基团能与溶液中的阴离子吸附结合,从而产生阴离子交换作用。
This kind of resin contains strong basic groups, such as Ji Anji
(also known as four class amines) - NR3OH (R is a hydrocarbon group),
which can dissociate OH in water and be strongly alkaline. The positive
group of the resin can be combined with the adsorption of anions in the
solution, thus producing anionic exchange.
这种树脂的离解性很强,在不同pH下都能正常工作。它用强碱(如NaOH)进行再生。
The resin has a strong dissociation and can work normally under
different pH. It is regenerated with a strong base (such as NaOH).
2. 弱碱型阴离子交换树脂:
这类树脂含有弱碱性基团,如伯胺基(亦称一级胺基)-NH2、仲胺基(二级胺基)-NHR、或叔胺基(三级胺基)-NR2,它们在水中能离解出OH-而呈弱碱性。这种树脂在多数情况下是将溶液中的整个其他酸分子吸附。它只能在中性或酸性条件(如pH1~9)下工作。它可用Na2CO3、NH4OH进行再生。
2., weak base anion exchange resin: these resins contain weak base
groups, such as primary amine group (also called first order amino
group) -NH2, Zhong Anji (two grade amino group) -NHR, or tertiary amine
group (three level amino group) -NR2, they can dissociate OH in water,
but weakly alkaline. In most cases, this resin adsorb the whole other
acid molecules in the solution. It can only work under neutral or acidic
conditions (such as pH1 to 9). It can be regenerated with Na2CO3 and
NH4OH.